Initial Crustal Stress Regression Analysis Based On Displacement Function Method And Stability Analysis Of Rock Mass

With the rapid development of underground space technology, more and more underground caverns are inclined to be huger and be put into deeper. So, stability of rock mass around underground cavern grows more remarkable. One of the key elements is to analyze and know initial crust stress field to solve the problem.While traditional theory, such as classical pressure theory and theory of dispersed medium pressure, can not meet the requirements of engineering. The following are such theories and methods as nonlinear theory considering interaction between support and rock mass, which, based on quantity analysis technology and actual data of initial crust stress, can simulate complex geological condition, carven shape and supporting so that provide important reference for analysis of stability of rock mass around underground carven and design of supporting.Displacement function means for calculating geostress in FEM analysis of underground houses is used, based on crustal stress data of underground cavern of pump water station of Tong Guanshan Yixing to store energy, applying the displacement function theory and 3D nonlinear FEM,The thesis simulates a displacement field applied the boundary in engineering area and obtain the initial crust stress field through load function in ANSYS .the result shows that the error between regressed ones and actual ones is controlled in allowed limit and supply the important data for building and design. At last, the analysis of the redistribution of the initial crust stress and the distribution of the plastic area is made; the stability evaluation of the rock mass around the cavern is provided. The outcome is conformed with the reality. Then applys the approximately equivalent dissolved rule , and considers the action of anchor staff to consolidate the rock mass , and correspond model is established, Nonlinear Finite Element Method is applied to analyze the effect of the supports, the result shows that the action of anchor staff is obvious and deformation and stress state of the rock mass is greatly approved.So,the result conforms that the idea and the means used in the thesis is applicable.