Влияние коэффициента неравномерности расширения грунтового образца на механические характеристики

А. З. Тер-Мартиросян, Г. О. Анжело, Л. Ю. Ермошина, И. А. Боков, А. В. Манукян
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Abstract

Introduction. The most common method of determining the mechanical characteristics of the soil is triaxial compression testing. This type of testing is widely used both for applied and scientific purposes, and is described in the works of both domestic and foreign authors, as well as in regulatory and technical documentation. However, within the framework of scientific works by various authors, the coefficient of uneven expansion of a soil sample during triaxial tests is often neglected and is not taken into account when processing the test results. In the existing current regulatory and technical documents, such as GOST 12248.3–2020, consideration of the coefficient of uneven expansion of the soil sample under triaxial compression b is of a recommendatory nature. Materials and methods. Within the framework of the work, experimental studies by the triaxial compression method were carried out on sandy soil samples of different granulometric composition in order to determine its mechanical characteristics using two different methods of processing laboratory test results — taking into account the coefficient of uneven expansion of the soil sample and without it. Results. According to the results of the performed experimental studies, it was found that the exclusion of the expansion non-linearity coefficient b from the processing of laboratory test results leads to a significant overestimation of the values of the internal friction angle. However, the values of secant modulus of deformation at 50 % strength E50 are lower by an average of 7.7 % when the nonlinear expansion coefficient of the steel is excluded from the processing. Conclusions. Analyzing the results obtained, as well as taking into account various factors influencing the results of the study (density, humidity, etc.), additional laboratory tests are required in order to further clarify the correlation dependencies in determining the strength and deformation characteristics of sandy soils, with and without taking into account the coefficient b.
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土壤膨胀系数对机械特性的影响
介绍。测定土的力学特性最常用的方法是三轴压缩试验。这种类型的测试被广泛用于应用和科学目的,在国内外作者的作品中以及在法规和技术文件中都有描述。然而,在不同作者的科学工作框架内,土样在三轴试验过程中的不均匀膨胀系数往往被忽略,在处理试验结果时没有考虑到。在现有的现行法规和技术文件中,如GOST 12248.3-2020,考虑土样在三轴压缩下的不均匀膨胀系数b具有推荐性质。材料和方法。在工作框架内,采用三轴压缩法对不同粒度组成的砂土试样进行实验研究,采用考虑和不考虑土样不均匀膨胀系数两种不同的处理实验室试验结果的方法确定其力学特性。结果。根据所进行的实验研究结果,发现在实验室测试结果的处理中排除膨胀非线性系数b会导致内摩擦角值的显着高估。然而,在50%强度E50时,当不考虑钢的非线性膨胀系数时,割线变形模量平均降低了7.7%。结论。分析所获得的结果,并考虑到影响研究结果的各种因素(密度、湿度等),需要进行额外的实验室测试,以便进一步澄清在考虑系数b和不考虑系数b时确定沙土强度和变形特性的相关依赖关系。
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