复杂层状结构岩石抗剪强度试验方法研究

岩石的抗剪强度是边坡稳定性、地基强度和稳定性评价中的一项非常重要的指标,不同类型的岩体,岩石的抗剪强度特性是不同的,其中复杂层状结构岩石的抗剪强度是岩土工程研究的重点内容之一。工程中经常采用的岩石剪切试验方法包括室内试验和现场原位试验,由于试验约束条件不同,试验结果存在一定的差异。本文以某核电工程为例,该项目分别采用了室内试验和原位试验获取抗剪强度指标,通过对比分析试验结果及工程实践反演分析证明,对于地层组合复杂的沉积岩石,采用现场原位剪切试验,充分考虑了尺度效应和样品的代表性问题,所获取的成果更符合工程实际。

Study on shear strength test methods of complex layered rocks

The shear strength of rock is a very important index to evaluate the slope stability,ground capacity and stability.Different types of rock masses have different shear strength characteristics,and the shear strength of the rock with complex layered structure is one of the key contents of geotechnical engineering research.The common methods of rock shear test used include laboratory and in-situ test.Due to the different test constraints,the test results are different.A case study of a nuclear power project was carried out,in which the shear strength index was obtained by laboratory test and in-situ test respectively.Through comparative analysis of test and inversion analysis of engineering practice,for sedimentary rocks with complex strata assemblages,in-situ shear tests are more in line with engineering reality for the test method fully considering the scale effect and the representativeness of samples.