岩土工程勘察中十字板剪切试验的应用研究  

Research on the Application of Cross Plate Shear Test in Geotechnical Engineering Investigation

作　　者：陈波 Chen Bo(Shenzhen Geotechnical Comprehensive Survey and Design Co.Ltd.,Shenzhen,Guangdong 518172)

机构地区：[1]深圳市岩土综合勘察设计有限公司,广东深圳518172

出　　处：《江西建材》2024年第10期280-282,共3页

摘　　要：为准确得出工程场地内软土抗剪强度,通过开展十字板剪切试验,并与室内直剪试验测试结果进行对比,分析十字板剪切试验的应用效果,研究结果表明,区域内软土最大、最小以及平均抗剪强度分别为30.8、8.12和13.89 kPa,变异系数和标准差分别为0.789和4.92,最终得出软土抗剪强度标准值为12.36 kPa,同时,推算出抗剪强度指标黏聚力为8.13 kPa,内摩擦角为5.5°;室内直剪试验所得土体黏聚力和内摩擦角标准值分别为4.0 kPa和2.4°,均小于原位十字板剪切板试验结果,因此在工程勘察期间确定土体强度参数时,应优先采用对土体扰动较小的十字板剪切试验法。To accurately determine the shear strength of soft soil in the engineering site,a cross plate shear test was conducted and compared with the results of indoor direct shear tests to analyze the application effect of the cross plate shear test.The research results showed that the maximum,minimum,and average shear strengths of soft soil in the area were 30.8 kPa,8.12 kPa,and 13.89 kPa,respectively,with a coefficient of variation and standard deviation of 0.789 and 4.92,respectively.Finally,12.36 kPa was obtained as the standard value of soft soil shear strength,and the shear strength index cohesion was calculated to be 8.13 kPa,and the internal friction angle was 5.5°;The standard values of soil cohesion and internal friction angle obtained from indoor direct shear tests are 4.0 kPa and 2.4,respectively,which are lower than those obtained from in-situ cross plate shear plate tests.Therefore,when determining soil strength parameters in engineering investigations,the cross plate shear test method with less disturbance to the soil should be prioritized.

关 键 词：抗剪强度 十字板剪切试验 软土 工程勘察 

分 类 号：TU45[建筑科学—岩土工程]