基于SCPTU测试确定软土压缩模量方法研究

发布时间：2018-01-04 23:27

本文关键词：基于SCPTU测试确定软土压缩模量方法研究　出处：《地下空间与工程学报》2014年S1期 　论文类型：期刊论文

【摘要】：压缩模量是土的重要力学特性参数,对土的变形计算有重要影响。目前压缩模量的确定方法主要依赖于室内土工试验,但土样的采取、运输、保存等环节都会对土样的结构产生扰动,难以得到精确的压缩模量值,且室内试验费时,效率低。本文总结了国内外基于孔压静力触探CPTU参数确定土压缩模量的方法,统计了长江河漫滩地区上层粘土和国外参考文献中不同粘性土的剪切波速,以及室内试验中获得的压缩模量,提出了基于剪切波速预测土的压缩模量方法,根据现场不同场地的SCPTU试验,对已有方法和新方法作出了比较。结论表明:对于剪切波速小于200 m/s,压缩模量小于10 MPa的软土,基于剪切波速预测土的压缩模量的方法可靠,值得在工程应用中推广。
[Abstract]:Compression modulus is an important parameter of soil mechanical properties, which has an important influence on the calculation of soil deformation. At present, the determination method of compression modulus mainly depends on the indoor geotechnical test, but the soil sample is adopted and transported. Preservation and other links will disturb the structure of the soil sample, and it is difficult to obtain accurate compression modulus value, and the laboratory test takes time. This paper summarizes the methods of determining the compression modulus of soil based on the CPTU parameters of pore pressure hydrostatic penetration at home and abroad, and calculates the shear wave velocities of the upper clay in the Yangtze River floodplain area and the different clay soils in the foreign references. As well as the compression modulus obtained in the laboratory test, a method for predicting the compression modulus of soil based on shear wave velocity is proposed, and according to the SCPTU test of different site in the field. The results show that the shear wave velocity is less than 200m / s and the compression modulus is less than 10 MPa. The method of predicting the modulus of compression of soil based on shear wave velocity is reliable and worth popularizing in engineering application.
【作者单位】：东南大学岩土工程研究所;苏州轨道交通有限公司;
【基金】：苏州轨道交通有限公司科学基金资助项目(SZGDKY201303) 国家十二五科技支撑计划项目(2012BAJ01B02)
【分类号】：U416.1
【正文快照】： 1引言压缩模量是土的重要力学参数,在路基沉降,基坑变形问题的计算上起到重要作用。目前压缩模量的获取主要依赖于室内土工试验,常规的钻探、取样、土工试验的预测办法,由于土样扰动、试验方法、操作程序等问题,所得的结果往往与其真实值相差很大。地震波孔压静力触探作为一种

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