| Along with the large investment for highway construction of our country，the number ofhigh expressway tunnel increases more and more. During the tunnel excavation process thesurrounding rocks caused a series of fracture or crack, and under certain conditions, it maycause surrounding rocks collapse or lose stability. Therefore,it is very significant to analysysthe stability of surrounding rocks. Especially the stability of broken surrounding rocks is aninevitable problems, also it is an important problem to be solved.The first,this paper used the method of monitoring measurement information feedback toanalysis the stability of surrounding rocks,then through displacement back analysis to acquirethe parameters of the finite element method, and then through simulating the excavationconstruction procedure of Mayazi tunnel in finite element simulation to compare thesimulation results with monitoring measurement results. Furthermore, to analysis whether theexcavation and support scheme is rationable.The paper made the following main achievements:(1) Through the date analysis of the monitoring measurement on the cross sectionbetween the main tunnel and the inclined hole, obtained that the surrounding rock of this sectionis primarily stable；(2) Obtained the finite element simulation of the required parameters by displacementback analysis；(3) Set up the finite element numerical model of Ma Yazi excavation and supportscheme, compared the simulation results with monitoring measurement results, acquired thatthe excavation and support scheme of Ma Yazi tunnel is reasonable and feasible. |
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