新型便携式钻孔剪切仪研发与测试分析  

Development and Test Analysis of a New Portable Borehole Shear Equipment

作　　者：张建经[1] 马东华 曾鹏毅[1] 孙延军 何梦 ZHANG Jianjing;MA Donghua;ZENG Pengyi;SUN Yanjun;HE Meng(College of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,P.R.China;China Nuclear Geotechnical Engineering Co.,Ltd.,Zhengzhou 450008,He'nan,P.R.China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]郑州中核岩土工程有限公司,河南郑州450008

出　　处：《重庆交通大学学报（自然科学版）》2019年第11期90-97,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家重点研发计划(2017YFC0504901)

摘　　要：在分析了国外现有设备优缺点的基础上,研发了一套新型便携式钻孔剪切仪,并在室内模型箱和野外现场进行了大量试验。通过比较钻孔剪切试验与室内直剪、三轴试验的结果,发现钻孔剪切试验所得数据拟合的相关系数均大于0.98,其离散性比室内直剪试验小;所得粘聚力和内摩擦角分别比室内直剪试验小30%?50%和10%?25%,比室内三轴试验小9%和2%.针对上述结果,在分析3种试验的边界条件、试样破坏判别准则的基础上,给出了试验结果差异性的解释,提出了该仪器的适用范围与注意事项。Based on the analysis of the advantages and disadvantages of existing equipment abroad?a new type of portable drilling shearing instrument was developed,and a large number of experiments in the indoor model box and field were carried out.By comparing the results of borhole shear test with those of direct shear test and trt-axial test,it is found that all the correlation coefficients of data fitting obtained from borehole shear test arc greater than 0.98,and their discreteness is smaller than that of direct shear test;the obtained cohesion and internal friction angle arc 30%-50% and 10%-25% less than those of the indoor direct shear test respectively,and 9%and 2%less than those of the tri-axial test.For the above results,based on the analysis of the boundary conditions and sample failure criteria of the three tests,the explanation of the difference of the test results was given,and thr applicable scope and precautions of the proposed instrument wtrt proposed。

关 键 词：岩土工程 钻孔剪切试验 原位测试 抗剪强度指标 室内试验 

分 类 号：TU411.7[建筑科学—岩土工程]