含水率对路基压实土小应变剪切模量的影响规律

发布时间：2018-01-09 21:46

本文关键词：含水率对路基压实土小应变剪切模量的影响规律　出处：《岩土力学》2017年05期 　论文类型：期刊论文

【摘要】：运营期内路基土的含水率会由初始碾压含水率逐渐增大至平衡含水率,含水率的变化将会导致路基土路用性能的演化。结合已有文献中压实土剪切模量随含水率变化的实测结果与室内补充试验数据,研究了不同条件下含水率及压实度对压实土剪切模量的影响规律。结果表明:压实度不变时,路基土剪切模量随含水率的增加而减小,且压实度越大,剪切模量降低得越快;在低含水率下,剪切模量随压实度的增大而增加,但在较高含水率下,剪切模量随压实度先增加后降低,且峰值模量对应的压实度随含水率的增加而减小;峰值剪切模量对应的含水率略小于最大干密度对应的最优含水率;压实土剪切模量随稠度呈先增大、后减小的趋势,但不同黏粒含量的土体获得峰值剪切模量的稠度状态不同,且峰值模量对应的稠度与黏粒含量具有良好函数关系。
[Abstract]:During the operation period, the moisture content of subgrade soil will gradually increase from initial rolling moisture to equilibrium water content. The change of moisture content will lead to the evolution of roadbed soil performance. Combined with the measured results of the shear modulus of compacted soil with the change of moisture content and the indoor supplementary test data. The effect of water content and compaction on the shear modulus of compacted soil is studied under different conditions. The results show that the shear modulus of subgrade soil decreases with the increase of moisture content and increases with the increase of compaction degree. The faster the shear modulus decreases; At low water content, the shear modulus increases with the increase of compaction degree, but at higher water content, the shear modulus increases first and then decreases, and the compaction degree corresponding to the peak modulus decreases with the increase of moisture content. The moisture content corresponding to the peak shear modulus is slightly smaller than the optimal moisture content corresponding to the maximum dry density. The shear modulus of compacted soil increases first and then decreases with consistency, but the consistency of peak shear modulus is different with different clay content. The consistency corresponding to the peak modulus has a good functional relationship with the clay content.
【作者单位】：东南大学交通学院;东南大学江苏省城市地下工程与环境安全重点实验室;宿迁市交通工程质量监督站;
【基金】：中央高校基本科研业务费专项资金项目(No.2242014R30020) 宿迁市交通运输局科技课题(No.201310) 江苏省高校“青蓝工程”优秀青年骨干教师培养对象资助项目~~
【分类号】：U416.1
【正文快照】： This work was supported by the Fundamental Research Funds for the Central Universities(2242014R30020),the Science and Technology Project of Traffic andTransport Bureau of Suqian City(201310),and the Personnel Training Fund for Outstanding Young Teacher o

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