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利用室内剪切试验装置,开展不同正应力、自然与饱水条件下岩体异性结构面的剪切试验,分析异性结构面的剪切变形和强度特性,利用JRC-JCS抗剪强度力学模型将试验结果与计算结果进行对比分析。结果表明,(1)异性结构面的剪切变形曲线属于弹塑性残余变形类型。相比自然状态试件,饱水试件的弹性区减小,较早进入峰值区或塑性区;(2)异性结构面的剪切刚度均随法向力的增大而增大,但同一正应力下饱水试件的剪切刚度要小于自然状态的剪切刚度,在低法向力下尤为显著;(3)水对岩体异性结构面剪切强度参数有不同程度的弱化,尤其对内摩擦角的劣化明显;(4)只要计算参数选取得当,并考虑实际岩体的受力及水等情况,JRC-JCS计算模型可以为实际工程岩体的结构面强度提供较为准确的参数。
The shearing experiment of rock mass heterosexual surface with different normal stress, natural and saturated water conditions was carried out by using indoor shearing test device. The shear deformation and strength characteristics of the heterosexual structural surface were analyzed. Using JRC-JCS shear strength mechanical model Test results and calculated results were compared. The results show that (1) the shear deformation curve of the heterostructure surface belongs to the elastic-plastic residual deformation type. Compared with the natural specimen, the elastic region of the saturated specimen decreases and enters the peak or plastic region earlier. (2) The shear stiffness of the heterostructure surface increases with the increase of the normal force, but the same The shear stiffness of specimens saturated with water under normal stress is less than that of natural state, especially under the low normal force. (3) The shear strength of anisotropic structural plane of rock mass is weakened to different extents, especially (4) The JRC-JCS calculation model can provide more accurate structural surface strength for the actual engineering rock mass as long as the calculation parameters are properly selected and considering the actual rock mass stress and water conditions parameter.