Simulation Method Study Of Initial Geostress Field

This paper is to study the regression analysis of the initial geostress field. The stability of surface and underground works is closely connected with the state of initial geostress. Therefore,the reliability of initial geostress field adopted is one of the decisive factors that guarantee the method of analysis which can really reflect the engineering.Firstly ,this paper summarizes the actuality of back analysis of initial geostress and analyzes the major influential factors of that,taking relative datums from both home and abroad.A new practical analytical method is presented to simulate the initial geostress which uses the displacement as boundary condition in FEM, based on the fact that tectonic stress is produced by tectonic movement.Secondly, under the uniform condition the simply model is selected.The simulation results by using the displacement as the boundry conditions are compared to the results by using the stress as the boundry conditions.The simulation error are been analyzed.In pratice engineering,geostress is influenced by joint and fault.it is important how to judge in situ geostress valuces and calculated valuces reliable and effective or not.the paper aims at simply model,study some questions when we model geostress field which include joint and faults. The simulation error are been analyzed.Then, according to this thought,this paper use it in an actual engineering that xiao wan.The results indicated that the direction of the first principle stress is well accorded with the measured values.the measured values of the three selected points are in a good agreement with the in situ measured values.In the end, main ideas of this paper are concluded by the author, furthermore, some question for future studies are put forward.