| After complex formation process, the rock mass becomes a loose, soft, weak, uncertain,and variety of non-media with cracks and pores discontinuous.The coal mining in east of China have been fully developed in shallow coal seams.Then we need to cross the deep alluvium to developed deep mining. Tunnel and chamber surrounding exhibited plasticity characteristics.lt makes a series of support form and parameters and stability of surrounding rock engineering problems.So,To explore buried deep underground tunnel surrounding rock of the destruction of law and get the mechanical parameters of the actual engineering is an urgent problem to be solvedThrough the use of monitoring technology for water pump room which is960meters underground in Wangfenggang’s coal mine of huainan to obtain displacement data(horizontal convergence and vault sink).To obtain the rule of surrounding rock deformation, using the actual displacement convergence displacement data in the field measurement to back analysis In this article. In this paper, the main job is that:First,by assuming that the surrounding rock deformation in accordance with Mohr-Coulomb failure criteria in the process of deep underground tunnels excavation,extract the rules need to be i n the back analysis of mechanical parameters.Second. Established deep roadway model by using finite difference software FLAC3D, and nu merical simulation, due to the parameter too much, combined with the orthogonal design method, s orting by displacement back analysis of surrounding rock of the training sample. Through the analy sis of parameter sensitivity to displacement, extract the main mechanical parameters back analysis.Third. Using intelligent calculation method-genetic algorithm, to get the "genetic" sample data, and using MATLAB genetic toolkit for implementation, realization of deep roadway parameters inversion.Fourth. The back analysis of mechanical parameters of surrounding rock of roadway, through forward modeling analysis, comparing the displacement regularity get by positive analysis and field testing displacement convergence, verified the feasibility that invert the mechanical parameters of surrounding rock of roadway based on genetic algorithm. Figure [26] table [11] reference [56]... |
