原位钻孔剪切试验及其在残坡积土中的应用

摘要

通过现场原位试验获取岩土体强度参数一直是岩土工程领域的重要研究课题,介绍了Phicometre钻孔剪切试验仪的基本原理、试验过程和数据处理方法.为评估其在残坡积土中的工程适用性,使用其在粤北某航道边坡不同深度的残坡积土进行了现场试验.试验结果表明,钻孔剪切仪具有扰动小、速度快的特点,测试结果具有较好的线性相关性;对于数据离散性相对较小的均质地层,可采用整理破坏包络线法对其抗剪强度指标进行统计分析.%It has been an important research topic in the field of geotechnical engineering to obtain the strength parameters of rock and soil by in-situ test.The basic principle , test process and data processing method of Phi-cometre borehole shear tester were introduced .In order to evaluate its applicability in the residual slope soil , a field test was carried out on the residual slope soil in different depth of a channel slope in northern Guangdong province . Experimental results show that the instrument has the characteristics of small bore shear disturbance and speed , the test results is a good linear correlation;data for discrete homogeneous formation is relatively small , can be used to organize the failure envelope for statistical analysis on the shear strength index .