某水电站坝基岩体结构面直剪试验研究

c、φ值是衡量岩体结构抗剪强度的主要参数，一般通过岩体结构面直剪试验获取。岩体结构面直剪试验分为多点法和单点法，工程设计中通常采用多点法，而忽视单点法的重要作用。为了对两种试验方法进行比较，结合具体的试验项目, 运用携带式剪切仪，分别采用上述两种试验方法，对某水电站坝基岩体结构面的抗剪强度参数进行了试验测试。试验结果表明两种方法各有所长，并指出只有二者相结合才能客观反映岩体结构面的抗剪强度，从而提高工程设计的科学性、准确性和可靠性。

Experimental study on direct shear test of rock mass structure for a dam foundation

Value c and Ф are main parameters for measuring the shear-strength of rock mass structure and are generally obtained through direct shear test of rock mass structure.The direct shear test method of rock mass structure includes multi-point method and single point method,but multi-point method is generally adopted in engineering design while the importance of single point method is neglected.In order to compare the two test methods,in the combination of concrete test program and using portable shear apparatus,the test on shear-strength parameter of rock mass structure for dam foundation of a hydropower station was conducted with the two methods.The test result shows that each method has its merits and only their combined use can objectively reflect the shear-strength of rock mass structure,and improve the correctness and reliability of engineering design.