岩石抗剪强度测试方法的研究

A Study on the Determination Method of Rock Shear Strength

笔者认为三轴试验是测定岩石抗剪强度的最好方法,扭转法可测得与三轴试验较一致的强度值,也是国际上认定和推广的测试方法。但是,由于设备技术条件的限制,目前国内最常用的方法仍然是单面和双面剪切试验,笔者认为岩石抗压强度较低时宜采用单面剪切,而当岩石抗压强度较高时采用双面剪切更好。岩石经单面和双面剪切试验所绘制的τ—σ曲线和岩石三轴压缩试验获得的莫尔强度包络线几乎一致,因此对于一般工程项目利用岩石单面和单面剪力仪,测得的岩石抗剪强度是可以满足工程设计要求的.

The article deals with the concept of rock shear strength and its meaning.It estimates,in detail,the determination methods of rock shear strength at home and abroad.According to the experiences from the work of rock shear strength and a great amount of test data,the authors con- sider that the triaxial test is the best to determine rock shear strength, and that the turning method can obtain the strength value which basically corresponds with the value obtained by the triaxial test.Internationally, the method is also approved and popularized.Because limited by the equipment and technique,however,the method used frequently in China today is still the simple and double shear tests.The writers think it is better to use the simple shear test when rock shear strength is lower,and use the double one when the strength is higher.Because there is a correspondence between the τ-σ curve drawn by the simple and double shear tests and the Mohr's envelope obtained by the rock triaxial compression test,the rock shear strength obt(?)ined by using a simple or double shear equipment can meet the design demands for general engineening project.