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基于自然状态和饱和状态下不同种类岩石试件的室内压剪实验,对2种状态下岩石抗剪强度参数(c,Φ)的变化情况进行比较分析.引入抗剪弱化系数η(ηc,ηΦ)以定量地描述参数变化幅度,并将其定义为2种状态下参数差值与自然状态下参数值的比值.实验结果表明:饱和状态下不同种类岩石的抗剪强度参数较自然状态下会有明显但程度不同的降低;ηc的值分布在0.1～0.4之间,ηΦ的值分布在0.2以内,且自然状态下岩石抗剪强度参数越大,η越小,反之亦然,并通过回归分析得出ηc与c,ηΦ与Φ的之间的函数关系,这对岩体工程设计有重要的实际意义.
The shear strength parameters (c, Φ) of rock under two kinds of states are compared and analyzed based on the experiments of different types of rock specimen under natural and saturated conditions. The shear weakening coefficient η (ηc, ηΦ ) To quantitatively describe the range of parameter variation and define it as the ratio of the parameter difference under two states to the parameter value under natural conditions.The experimental results show that the shear strength parameters of different types of rock in saturated state are lower than those in natural state There are obvious but different degrees of reduction; ηc value distribution between 0.1 ~ 0.4, ηΦ value distribution within 0.2, and the natural state of the rock the greater the shear strength parameters, η smaller, and vice versa, and through regression It is analyzed that the relationship between ηc and c, ηΦ and Φ has important practical significance for engineering design of rock mass.