ASSESSMENT OF THE INFLUENCE OF ANISOTROPY AND INHOMOGENEITY ON THE STABILITY OF UNDERGROUND OPENING USING A MICROMECHANICS MODEL
This paper presents a study of the quantification of the degree to assess the influence of anisotropy and inhomogenetiy on the stability of underground opening using a micromechanics model. The approach builds on the finding that a realistic failure corresponding to a micro seismic event can be established by applying a tensile cracking model and the traditional shear model. In our model, the inhomogeneous characteristics of rock at the microscopic level are included by assuming that the material properties of the constituent elements conform to a Weibull distribution; the anisotropy is incorporated as a transversely isotropic medium; the non-elastic characteristic is simulated via an elastic damage-based constitutive law. A finite element program is employed as the basic stress analysis tool. Finally, the influence of rock anisotropy and excavation shape is modeled using the Realistic Failure Analysis code; the whole fracturing process of initiation, propagation and coalescence of fractures around excavations under a variety of loading conditions are simulated. It is found that this micromechanics model may used as a useful tool to improve the understanding of realistic rock failure process.
Shuhong Wang Tianhong Yang Fei Li Chun-an Tang
School of Resource and Civil Engineering, Northeastern University, Shenyang, 110004, P. R. China School of Resource and Civil Engineering, Northeastern University, Shenyang, 110004, P. R. China;Dep
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）