Modeling shear resistance of heterogeneous rock joint by using manifold method
The presence of joints may significantly affect the mechanical behavior of rock masses by reducing their capacity to bear shear and tensile loading. Considerable efforts have been contributed to the development of accurate rock joint models. In this paper, a numerical investigation of the mechanical behavior of initially mated artificial joints with saw-tooth shaped asperities is undertaken. Shear response of homogeneous joints is firstly studied. The influences of joint roughness and normal stresses are investigated. Numerical results are compared with theoretical solutions. Good agreements have been observed. Then, material and geometrical heterogeneities for rock joint are incorporated into the manifold method. Numerical results indicate that material heterogeneity will reduce the shear strength. However, its effect is very limited, which is within 8％. In contrast, the shear strength can be increased significantly when the geometrical heterogeneity is introduced. The shear mechanism of rock joint with geometrical heterogeneity is dominated by the largest asperity. Based on this observation, a simple model is proposed to predict its shear strength. The results from the proposed model match well with the numerical results.
Shear strength Homogeneous joint Material heterogeneity Geometrical heterogeneity Manifold method
G.W.MA X.M.AN Y.X.ZHOU
School of Civil and Environmental Engineering, Nanyang Technological University, SINGAPORE 639798 Defence Science & Technology Agency, SINGAPORE 109679
国际会议
北京
英文
33-38
2007-08-14（万方平台首次上网日期，不代表论文的发表时间）