sibadiНаучный рецензируемый журнал "Вестник СибАДИ"The Russian Automobile and Highway Industry Journal2071-72962658-5626The Siberian State Automobile and Highway University10.26518/2071-7296-2022-19-5-738-751sibadi-1540Research ArticleСТРОИТЕЛЬСТВО И АРХИТЕКТУРАCONSTRUCTION AND ARCHITECTUREПрогнозирование главных напряжений от внешней нагрузки в насыпном массиве из песка с учётом его механических характеристикPrediction of principal stresses due to external load in sans mass considering its mechanical characteristicshttps://orcid.org/0000-0001-5857-1891ЛунёвА. А.LunevA. A.

Лунёв Александр Александрович – канд. техн. наук; директор центра компетенций в сфере использования вторичных материальных ресурсов в строительной отрасли

г. Омск

Aleksandr A. Lunev — Cand. of Sci., the Head of the Competence centre for the use of recycled material resources in construction industry

Omsk

lunev.al.al@gmail.comhttps://orcid.org/0000-0002-1540-1160КацарскийР. С.KatsarskiyR. S.

Кацарский Роман Сергеевич – магистрант; заведующий лаборатории центра компетенций в сфере использования вторичных материальных ресурсов в строительной отрасли

г. Омск

Roman S. Katsarskiy – Master’s student, the Head of the laboratory in the Competence centre for the use of recycled material resources in construction industry

Omsk

katsarroman@mail.ruСибирский государственный автомобильно-дорожный университетРоссияSiberian State Automobile and Highway University (SibADI)Russian Federation202212112022195738751Copyright © Лунёв А.А., Кацарский Р.С., 20222022Лунёв А.А., Кацарский Р.С.Lunev A.A., Katsarskiy R.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestnik.sibadi.org/jour/article/view/1540

Введение. Часть методов проектирования земляных сооружений и оснований базируется на решениях по прогнозированию напряжённого состояния грунтов под действием внешней нагрузки, которые не учитывают особенности структуры материала. Это входит в противоречие с существующими исследованиями, которые указывают на то, что изменение влажности, плотности и формы частиц материала влекут изменения в механизме формирования напряженного состояния. Согласно исследованиям при изменении вида грунта, влажности и плотности массива изменяются как его механические характеристики, так и напряженное состояние, что требует учета при проектировании земляных сооружений и оснований зданий.Материалы и методы. Для изучения напряженного состояния, возникающего в песчаном грунте с различными механическими характеристиками, были проведены экспериментальные исследования по определению давлений в песке различной плотности и влажности под действием внешней нагрузки от круглого штампа площадью 500 см2. Для этого на глубине 5, 15, 25, 40 см по оси круглого штампа в массиве песка средней крупности устанавливали месдозы, после чего измеряли давления при приложении нагрузки. Для каждого значения плотности и влажности, созданного в процессе эксперимента, определяли механические характеристики песчаного грунта.Результаты. Анализ существующих зависимостей для прогнозирования максимальных главных напряжений показал, что решения Кандаурова и Фрелиха, единственные дающие связь формирования напряженного состояния с механическими характеристиками и позволяющие прогнозировать минимальные главные напряжения. Было установлено влияние механических характеристик песчаного грунта (угла внутреннего трения и модуля упругости при разной плотности и влажности) на параметр Фрелиха и коэффициент распределительной способности среды решения Кандаурова.Обсуждение и заключение. Анализ результатов экспериментальных исследований позволил вывести зависимости для прогнозирования максимальных главных напряжений песчаного грунта в точках, расположенных на разной глубине, по оси нагруженного круглого штампа. Предложенные зависимости являются модификацией решений Кандаурова и Фрелиха, в которых учтена связь между механическими характеристиками песчаного грунта и параметрами распределяющей способности среды.

Introduction. A part of the methods for designing earthworks and foundations is based on solutions for predicting the stress state of soils under the action of an external load, which do not take into account the structural features of the material. This is in conflict with current studies, which indicate that changes in the moisture content, density, and shape of material particles entail changes in the mechanism of stress state formation. According to some research, when the type of soil, moisture content and density of the mass change, both its mechanical characteristics and the stress state change, which requires consideration in the design of earthworks and building foundations.The method of research. To study the stress state arising in sandy soil with different mechanical characteristics, experimental studies were carried out to determine the pressures in sand of different density and moisture under the action of an external load from a round stamp with an area of 500 cm2. To do this, at a depth of 5, 15, 25, 40 cm along the axis of a round stamp in an array of sand of medium size, mesdoses were set, after which the pressures were measured when the load was applied. For each value of density and moisture created during the experiment, the mechanical characteristics of the sandy soil were determined.Results. The analysis of the existing dependencies for predicting the maximum principal stresses showed that the Kandaurov and Frohlich’s solutions are the only ones that give a connection between the formation of the stress state and mechanical characteristics and allow predicting the minimum principal stresses. The influence of the mechanical characteristics of sandy soil (the angle of internal friction and the modulus of elasticity at different density and humidity) on the Frohlich’s parameter and the distribution capacity coefficient of the medium of the Kandaurov’s solution was established.Conclusion. The analysis of the results of experimental studies made it possible to derive dependencies for predicting the maximum principal stresses of sandy soil at points located at different depths along the axis of a loaded round stamp. The proposed dependencies are a modification of Kandaurov and Frohlich’s solutions, which take into account the relationship between the mechanical characteristics of sandy soil and the parameters of the distribution capacity of the medium.

строительствогрунтымеханика грунтовглавные напряженияconstructionhighwayssoil stabilisationsoilsprincipal stressРабота выполнена при финансовой поддержке Совета по грантам президента РФ (грант для государственной поддержки молодых российских ученых – кандидатов наук МК-4285.2022.4). Отдельную благодарность авторы выражают анонимным рецензентам, чья работа позволила существенно повысить качество статьи.The work was supported financially by the Council for Grants of the President of the Russian Federation (grant for state support of young Russian scientists - candidates of sciences MK-4285.2022.4). The authors are especially grateful to the anonymous reviewers, whose work has significantly improved the quality of the article.ReferencesKešner A. et al. Stress distribution on a soil tillage machine frame segment with a chisel shank simulated using discrete element and finite element methods and validate by experiment. Biosyst. Eng. 2021. Vol. 209. 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The authors declare that there are no conflicts of interest present.