Introduction. The process of formation of wells in frozen soils is one of the complex processes of excavation. A drilling tool of a new geometric shape forms a well by brittle destruction of the rock. The purpose of the conducted experimental studies was to determine the effect on the energy intensity of the drilling process and on the well diameter coefficient of the angle of rotation of the radius of the screw blade, at which its increment occurs on the destructive part and the angle of inclination of the forming upper surface of the screw blade to the axis of rotation.

Materials and methods. The article describes a methodology for conducting laboratory experiments to study the interaction of a drilling tool of a new geometric shape with frozen soils. The ranges of values of the studied factors are determined. The matrix of the complete factorial experiment is constructed.

Results. As a result of laboratory experiments, the influence of the geometric parameters of the drilling tool on the energy intensity of the drilling process and on the well diameter coefficient was determined. The dependencies of the torque and the well diameter coefficient on the angle of rotation of the radius of the helical blade, at which its increment occurs on the destructive part, the angle of inclination of the forming upper surface of the helical blade to the axis of rotation and the angle of elevation of the middle helical line of the helical blade are established.

Discussions and conclusion. It is established that the drilling tool carries out the formation of a well due to the brittle destruction of the well, which makes it possible to achieve more efficient drilling. And also the dependences of the rational values of the investigated geometric parameters of the drilling tool of a new geometric shape are determined.

Introduction. Impact-vibration machines, which perform soil compaction with periodic removal of the working body from the ground, are the most common for mechanization of soil compaction in road construction: self-propelled non-reversible and reversible vibratory plates, vibratory rammers, mounted excavator vibratory plates, trench vibratory rollers and soil vibratory rollers. It is necessary to analyze the main technical characteristics of impactvibration machines of different types in order to assess the possibility of developing a mathematical model of soil compaction, combining several types of impact-vibration machines at once.

Materials and methods. The technical characteristics of different types of impact-vibration machines for the analysis: 342 models of non-reversible self-propelled vibratory plates; 312 models of reversible self-propelled vibratory plates; 311 models of vibratory ground rollers; 63 models of mounted vibratory plates for excavators; 24 models of vibratory rammers and 21 models of trench vibratory rollers are used. The machine mass (for vibratory plates of different types) or the mass per compaction module (for vibratory rollers of different types) was taken as a main parameter.

Results. The graphical dependencies have been obtained. They illustrate that for the given types of shock-vibration machines the excitation force, relative excitation force and oscillation frequency are located on mutually contiguous and continuing parts of curves. This is a common pattern: as the mass of the machine increases, the excitation force increases, but the relative excitation force and frequency of oscillation decrease. Vibratory rammers are out of this general pattern, because at comparable weight they have significantly lower frequency of oscillation (9...12 Hz) and high amplitude (50...75 mm). Also, the mounted excavator vibratory plates stand out from the general pattern, having a smaller range of vibration frequencies for machines of similar weight, moreover, they perform soil compaction positionally, and not in the process of movement at a certain speed, as other impact-vibration machines.

Discussion and conclusions. The common pattern of changes in the main technical characteristics of selfpropelled non-reversible and reversible vibratory plates, trench rollers and soil vibratory rollers at close nominal amplitude of their vibrations gives grounds for the development of a unified theoretical description of the interaction of the working bodies of these types of machines with the compacted soil and a common method of calculating the influence of technical characteristics and operating modes of these machines on the results of soil compaction.

Introduction. The influence of urban passenger transport on the formation of a comfortable urban environment is indicated. The role and place of the fuel and energy supply infrastructure as one of the subsystems in the urban ground passenger transport system is determined. The results of the review of scientific works in the field of designing the infrastructure of fuel and energy supply are presented. The insufficient degree of development of methodological support forming the integrated development of subsystems of urban passenger transport is noted. The purpose of the study is formulated, the tasks are defined, the solution of which ensures its achievement.

Materials and methods. A brief description of the methodology for determining the main technological parameters of the fuel and energy infrastructure of the urban ground passenger transport system is presented. The sequence of use of the presented calculation formulas is determined, the main hypothesis underlying the research is described. The expected results are described.

Results. As intermediate results of the conducted research, the data and functional dependencies obtained in the process of performing the research part of the work are presented. These data provide practical implementation of the developed methodology and allow modeling of the parameters of the projected infrastructure. The dependencies obtained as a result of modeling and which are the basis for the development of optimization measures are given. 

Discussion. It is noted that the logistics approach implemented in the development of the presented methods allows us to determine the design parameters of the fuel and energy infrastructure as one of the subsystems of urban passenger transport, which ensures the coordinated development of the system based on the conditions for achieving maximum efficiency.

Conclusion. As a generalizing conclusion, it is noted that the practical implementation of the developed methodology within the framework of an integrated system approach makes it possible to achieve the set goal – to increase the efficiency of the urban ground passenger transport system.

Introduction. During the operation of heavy-duty diesel equipment in areas with a low-temperature climate, engine oils are contaminated by coolant and water. The ingress of these substances into the lubricant leads to a deterioration in its quality indicators, which subsequently leads to problems in the nodes of the internal combustion engine.

Relevance. The deterioration of the values of engine oil quality indicators is directly related to the presence of water and coolant in it. It is not always possible to objectively track the ways of leakage of these pollutants, and this, in turn, leads to serious consequences in the form of wear of the contacting surfaces of engine parts, corrosion. It is also important to evaluate the resource of lubricant additive packages due to its dilution with water and antifreeze.

Materials and methods. This paper presents the results of a literature review aimed at studying the ways of coolant and water ingress during the operation of diesel engines, their influence on the physical and chemical properties of motor oils. The brief information about the composition of the coolant is indicated.

Conclusions. The ingress of water and coolant into the engine oil leads to an increase in the kinematic viscosity of the lubricant, as well as to the formation of deposits on the surfaces of the engine friction pairs. In addition, spherical compounds appear in the crankcase of the engine, which are a combination of destroyed additive packages and glycol. Oil change intervals must be monitored at an increased rate of water and coolant entering the engine oil.

Scope of the study / possibility. This type of study will help to determine the causes of penetration of water and coolant into the crankcase space, to understand the consequences of using engine oil contaminated with water and coolant.

Originality / value. The conducted research can be the basis for the development of recommendations for improving the maintenance of internal combustion engines for enterprises that have at their disposal cars with diesel engines in order to increase the resource of power units and reduce operating costs.

Introduction. The relevance of the research carried out is justified by the need to plan performance indicators of rolling stock in the context of changes in the technology of cargo transportation in international traffic when implementing the Draft Order of the Ministry of Transport of the Russian Federation. An obligatory element in the technology of cargo transportation is the re-coupling of a semi-trailer or reloading of cargo. In practice, there are additional costs for the transportation of goods due to the significant waiting time for interchange due to the deviation of the time of arrival of rolling stock transporting goods in international traffic to the interchange point in accordance with the contract from the planned time of arrival at the interchange point. Today, there is no methodology for planning the operation of rolling stock of road transport in international traffic that takes into account modern requirements for the technology of cargo transportation in terms of eliminating waiting time at the point of transfer or reloading of cargo. The purpose of this article is to develop an algorithm for a planning methodology based on the mathematical model of the functioning of rolling stock in international traffic, created for the first time by the authors, taking into account modern requirements for cargo transportation technology.

Materials and methods. To achieve the purpose of the study, the scientific foundations of current planning of the work of a motor transport enterprise are applied. The development of a mathematical model for the functioning of rolling stock in international traffic was carried out on the basis of the criterion - minimum transportation costs, taking into account the duration of technological operations, including waiting time at the point of transfer or reloading of cargo. The systematic nature of the study lies in the fact that the properties of cargo transportation are manifested in relation to rolling stock and depend not only on the properties of the cargo, but also on transportation technology, the time of completion of the transport process, which are established in the contract and affect the performance of the rolling stock.

Results. The use of planning methodology for the practice of functioning of rolling stock in international traffic, taking into account modern requirements for cargo transportation technology, was carried out using the example of transporting a disassembled hydraulic vulcanization press. Software and mathematics have been developed to calculate costs.

Conclusions. A methodology for planning the functioning of rolling stock in international traffic has been developed, taking into account modern requirements for the technology of cargo transportation based on the created mathematical model, using regulatory requirements for the transportation of goods in international traffic and promising theoretical studies. Practical implementation is presented using the example of a DAF XF 480 FT truck tractor with a Kogel S24-1 semi-trailer.

Relevance. Passenger road transport in the 90s of the last century showed a high rate of transition to new management methods. The subsequent streamlining of activities progressed unevenly, mainly through regulation. However, important problems in the development of the industry, especially in the regions, have not been resolved. A crisis situation in intra-regional inter-municipal transportation and a high accident rate are the example. To a large extent, this situation is caused by the lag of the modern interpretation of the regional passenger road transport system from its real state, which does not allow achieving the greatest effect in the development of passenger road transport. The purpose of the work is to increase the importance of regular passenger transportation based on the substantiation of the importance of the structural parts of regional passenger motor transport systems, the developed methodology for assessing their condition, and creating development rules taking this into account.

Materials and methods. General scientific methods of analysis and synthesis, system analysis, mathematical statistics, as well as the provisions of the theory of transport processes and systems are used in the work. Modern general scientific software products, open information resources about passenger vehicles in the regions were used.

Results. The main scientific result of the article is the introduced concept of a regional passenger motor transport system. For a quantitative assessment of its condition, an indicator of the level of system self-organization has been developed, which is determined by the ratio of the number of cars to the number of buses, trolleybuses and trams in the region. The values of the indicators are in the range from 74 to 543 with an average value of 277. The dependencies of the influence of gross regional products and the number of population in the regions on the number of buses and cars in them are revealed. The practical significance lies in the development of tools for assessing the state of regional passenger transport systems. The directions for further research to determine the influence of structural parts on the level of self-organization of the system, building on this basis effective regional strategies for the development of passenger road transport are related.

Introduction. The prerequisite for the study of the problem was the Strategy for the spatial development of the country for the period until 2024, proposed by the President of the Russian Federation, the basis of which is transport infrastructure by mode of transport, ensuring the connectivity of settlements, requiring phased modernization, personnel, technical and technological support, digitalization and integration into one ecosystem of digital services both for individual modes of transport and in aggregate as a ‘single window’ for the state and business for all transportation. The subject of the research was the digital transformation of the transport sector using the example of the automobile and road complex as the most in demand and, in our opinion, receptive to the digital economy.

Materials and methods. Currently, compatibility, coordination and interaction of various modes of transport are becoming important when performing multimodal transportation of goods and passengers using digital technologies and platform solutions. In other words, a unified digital platform of the transport complex must be created, which is a systemic basis for information interactions and unites all current and planned information and digital solutions based on agreed principles, rules and standards

Results. The incomplete list of objects of digital transformation given in the article, due to its wide variety of systems necessary for use in transport, indicates its scale and adaptation to the needs of transport of existing achievements and new technical solutions in various fields. At the current stage, in order to solve the current problems, cooperation of industry scientific organizations is required, taking into account the main directions of their activities, current scientific, technical and personnel potential, integration with institutes of the Russian Academy of Sciences, scientific, design organizations and industrial enterprises of advanced high-tech and knowledge-intensive industries, with international scientific research. community.

Conclusion. The methods and activities proposed in the article will ensure maximum efficiency and unity of the basic principles of the functioning and development of mobility systems in all regions and cities of the Russian Federation, will ensure an accelerated transition to the digital economy and the achievement of technological sovereignty of our country.

Introduction. The experience of Russian computer companies in the field of information modelling technologies (IMT) in construction is analyzed. The attention to the role of standardization and classification of construction information (CSI) for coding elements of the digital information model (DIM) at the stages of organizational design and calendar planning is drawn. The specificity of linear objects with respect to the level of elaboration of model elements and their attribute characteristics at different planning levels is noted. 

Models and methods. The necessity of an individual approach to the decomposition of road structure elements taking into account the complex of natural and man-made factors is substantiated. At different stages of designing the organization of road construction, the timetable with different degrees of detail depending on the design objectives and available information about the object is presented. The parameters of specialized flows of a linear object, limitations and criteria for the optimality of the calendar plan at the design stage of the construction organization (CO) are determined. The level of elaboration of the model elements at the stage of work production by the contracting organization has been increased. The developed algorithm for forming a complex flow graph in the form of a flowchart and a DIM is presented.

Results. The use of the method is considered on the examples of structuring the elements of the object and technological processes at the stage of work production by the contracting organization, taking into account different options and schemes for organizing the work of specialized streams. The design results are presented in the form of a calculation matrix, a cyclogram and a Gantt graph in the MS Project program.

Discussion and conclusion. The development of the basic information for the model of the calendar plan for the construction of a road at different stages of design in an integrated general data environment is presented. The use of linear road is justified.  zoning as a method of decomposition of a linear object at the stages of CAD, POS and work production by the contracting organization. The structural elements of the design at the final stage (work production by the contracting organization) are linear design and technological modules and specialized flows formed on the basis of maps of labor processes of the contracting organization.

Introduction. The natural processes associated with the thawing of permafrost and the accompanying risks of man-made disasters have been steadily increasing in recent years. At the same time, a new space of opportunities opens up for the development of territories, the formation of new cargo transportation routes, both in transit and directly to the Arctic regions. The number of consumers is increasing, the requirements for the economic efficiency of transport infrastructure and the requirements for materials for its construction and maintenance are increasing.

Materials and methods. Water ice is one of the most widespread substances in the northern nature, and the experience of its use as a building material goes back centuries. At the same time, the use of water ice still has no alternative in the construction of seasonal ice roads and crossings, including for solving the tasks of oil and gas companies. This article is devoted to the possibilities of using modern materials that change the properties of water ice and structural and technological solutions to increase the carrying capacity and safety of ice crossings and extend the service life of winter trucks.

Results. Experimental and theoretical studies, tests at the landfill, pilot production tests at ice crossings have shown the possibility to significantly increase the carrying capacity and safety of the transport when reinforcing ice. The introduction of water ice modifiers together with its reinforcement significantly improve the physical and mechanical properties of water ice.

Conclusion. The authors’ idea of the possibilities of a significant increase in the bearing capacity of the ice cover on winter roads, traffic safety, prolongation of their service life with the combined use of special reinforcing materials and chemical modifiers of water ice is presented. The reasons for the limited use of the recommendations proposed by the authors are disclosed.

Introduction. The growing dynamics of road construction, the active improvement of domestic road structures and technologies, and the modernization of the production base will make it possible to form a comprehensive sustainable transport framework for the country, which will provide an impact to the entire economy of the Russian Federation. One of the economically and technologically advantageous solutions for this is the development and construction of road structures using zeolite - pozzolanic additive. The analysis of Russian and foreign sources indicates that pozzolanic additives improve the physical and mechanical properties of road building materials. The purpose of the work is to develop road pavement structures using zeolite from the Tatarsko-Shatrashanskoe deposit. To achieve this purpose, the tasks such as the development of road building materials using zeolite ( local mineral materials treated with Portland cement and zeolite are used for base layers, warm asphalt concrete with zeolite is used for coating layers), the  design and calculation of road pavements using zeolite from the TatarskoShatrashanskoe deposit were solved.

Materials and methods. The experimental laboratory studies of materials in accordance with GOST 23558, GOST R 70396, GOST R 58406.8, GOST R 58406.9, GOST 9128, GOST 12801 were carried out. The calculation of road pavement structures in the Credo Radon software package for permissible elastic deflection, shear resistance, bending resistance, static load, frost resistance, drainage layer for climatic conditions typical of the Republic of Tatarstan, according to PNST 265, GOST R 58818 was carried out.

Results. As a result of the research, the physical and mechanical properties of samples of road building materials using zeolite, which correspond to regulatory requirements were determined. The design and calculation of road pavements using zeolite in the Credo Radon software package was carried out. Structural transverse profiles of highways of categories IV and V using zeolite from the Tatarsko-Shatrashanskoe deposit have been proposed. The use of developed materials and road structures will currently improve the economy, rational environmental management of the region and, in general, provide an opportunity to improve the quality of life in cities and towns by successfully completing the five-year road activity plan.

Introduction. Vibrations of building structures and mechanism parts were analyzed. The need to investigate the oscillation processes and vibration reliability of steel beams prestressed by web drawing was formulated. The subject of study is structural steel. The object of study is bimetallic steel beam prestressed without rods.

Materials and methods. The scientific inquiry is based on the basics of structural mechanics of buildings and structures: superposition principle, differential equation of deflection curve of a bar, energy method, and methods of determination of stress-strain state of prestressed steel bars.

Results. A comparative analysis of vibration reliability of non-prestressed beams and prestressed structures of equal bearing capacity was performed. Rotations of the beam supporting nodes loaded by prestressing forces and external impacts were determined by integration of differential equation of deflection curve of a split bar. The support moments in rigid supporting nodes of structures were determined on the basis of superposition principle. The developed methods of stressed condition of prestressed bars are the basis for determination of normal stresses in the sections of beams under study. The resultant stresses were obtained by algebraic addition of prestresses and stresses from external loads. Dynamic parameters of bearing capacity of beams were determined on the basis of works by I.M. Rabinovich and V.A. Kiselev. The oscillation circular frequency of conventional and prestressed beams was established, analytical expressions for determination of angular velocity of prestressed bending elements were formulated, and the dynamic deflections and factors of structures were determined. It is found that the circular frequency of prestressed beams hinged in supporting nodes compared to the circular frequency of conventional beams decreases by a factor of 1.4 and by a factor of 5.6 in beams with rigid supports. Angular velocity decreases by a factor of 1.4 (hinge supports) and 6.8 (rigid supports), respectively. The deflections of prestressed beams are reduced by a factor of 1,87: 11,9. There is a significant reduction in the stressed condition of prestressed structures.

Conclusions. A hinged traditional beam under external and vibration loads in limit state is in the material yield zone and does not meet the first and second limit state conditions. These structures have the lowest vibration reliability. Prestressed structures are more reliable. With rigid supporting nodes, the moments of prestressing forces coincide with the supporting moments and produce hogging with the vector opposite to the external load deflection vector. In the limit state, total deflections are less than the external load deflections. Stresses in the structure decrease. Since load moments and beam deflections are initial parameters for dealing with dynamic strength tasks, we may state that prestressed beams with rigid supporting nodes have an increased vibration reliability.