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The Finite Element Method for Determining the Initial Earth Stress by Displacements in Surrounding Rock

Yang Linde Huang Wei Wang Yu  
The finite element method is used in this paper to determine the initial earth stress by displacements in surrounding rock around an excavation, including the linear elastic and elasto-plastic problem. Not only the calculation theorem and formulae, but also the flow chart for nonlinear plane strain problem and example of verification are in it, which can be used in practice.The main features of this method are as follows:1. One can use in calculation the displacement information that can be got easily through in-situ measurements;2. It can be used for any shape excavation and at any excavating stage;3. It can eliminate the effects of spacial action induced by excavation;4. It can determine the initial tectonic stress independently (namely, not with the gravitational stress), because of which one can determine the initial earth stress distribution more accurately.In addition, this method has also considered the way that can enhance the calculation accuracy by using the statistics theorem.
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