失水干燥对路基压实黏质土抗剪强度特性的影响

发布时间：2018-01-15 00:32

本文关键词：失水干燥对路基压实黏质土抗剪强度特性的影响　出处：《吉林大学学报(工学版)》2017年02期 　论文类型：期刊论文

【摘要】：为了客观可靠地评价干旱、半干旱地区路基压实土的工程性能,采用三轴压缩试验研究了某工程黏质土在不同干燥状态下的抗剪强度特性,分析了失水率对抗剪强度指标(黏聚力、内摩擦角)与抗剪强度的影响以及作用机理,建立了黏聚力、内摩擦角及抗剪强度与失水率的关系方程。结果表明:失水干燥可显著提高路基压实黏质土的抗剪强度及抗剪强度指标,黏聚力、内摩擦角和抗剪强度均随失水率的增加而递增,其中黏聚力、抗剪强度与失水率均呈指数函数关系,内摩擦角与失水率呈二次函数关系。失水干燥有利于提高路基的承载能力与稳定性,研究成果可为干旱、半干旱地区黏质土路基的设计与施工提供理论依据及技术参考。
[Abstract]:In order to evaluate the engineering performance of embankment compacted soil in arid and semi-arid area objectively and reliably, the shear strength characteristics of engineering clay under different drying conditions were studied by triaxial compression test. The influence of water loss ratio on shear strength (cohesion, internal friction angle) and shear strength were analyzed, and the cohesive force was established. The results show that dehydration drying can significantly improve the shear strength, shear strength index and cohesion of compacted clay of roadbed. The internal friction angle and shear strength increase with the increase of water loss rate, and the cohesion, shear strength and water loss rate are all exponential functions. The relationship between the angle of internal friction and the rate of water loss is quadratic. Dehydration and drying can improve the bearing capacity and stability of roadbed, and the research results can be drought. The design and construction of clay subgrade in semi-arid area provide theoretical basis and technical reference.
【作者单位】：吉林大学交通学院;吉林建筑大学交通科学与工程学院;
【基金】：国家自然科学基金项目(51308256) 吉林省交通运输科技计划项目(2011-1-3)
【分类号】：U416.1
【正文快照】： 0引言在我国西北干旱区以及华北、东北的部分地区,气候干旱,降水稀少,蒸发作用强烈,年蒸发量超过年降水量数倍至数十倍,加上地下水位相对较深,公路路基在修筑后就一直处于不同的失水干燥状态,正确可靠地评价干燥路基压实土的工程性能对于指导这些地区公路路基的设计与施工以及

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