Numerical Simulation on Rheologic Fracture Process of Rock Cavern Roof
会议名称：《The 4th Pacific Rim Conference on Rheology》
会议日期：1000年
学科分类：080103[工学-流体力学] 08[工学] 0801[工学-力学（可授工学、理学学位）]
关 键 词：rock cavern rheological fracture separating deformation.
摘 要：正 There are some damage and separating deformation in the roof of some rock cavern. According to in-situ investigation and measurement, separating deformation of roof at the cavern exit reached about 75mm -78mm, and there are damage and fracture phenomenon like cantilever beam at lateral side of cavern roof. In order to research into the fracture process of the roof for the cavern and long-term stability, the numerical simulation and back analysis on rheologic fracture are carried out by using in-situ measured damage pattern and deformation data, based on the tracking method of maximum tensile stress and the back analysis of rheologic fracture presented by authors. In the process of back analysis, the orthogonal experiment is used to design 27 kinds of the schemes of numerical simulation. The optimum scheme of parameters which are composed of the rheologic parameters of rock layer and thin double-layer and other sensitive parameters is obtained by analyzing the orthogonal experiment results. The long-term stability and the process of rheologic fracture are analyzed utilizing the obtained optimum scheme. The calculated results show that the separating deformation the roof at the cavern exit is 54.24mm and the fracture location is same as the location of in-situ fracture. In addition, the separation deformation of roof at the cavern recess is also very obvious in rheologic numerical simulation, and the phenomenon is similar to the apparent form of in-situ observed deformation.