Study On The Rich Water And Weak Surrounding Rock’s Instability Mechanism Of Large Section Ingate In West Area

With the rapid economic growth of our country, the demand for energy is increasing, especially in coal based energy consumption. Shallow coal resources gradually exhausted, in the next time, the exploitation of deep coal resources has become a trend of development.As the depth of coal mining, the rock of deep surrounding rock is big, the ground temperature is high, and the surrounding rock shows obvious big rheological and nonlinear deformation characteristics. The rheological characteristics of rock mass is refers to the engineering rock mass is disturbed by the construction, deformation of rock mass after a longer period of time will be relatively stable state is reached, but the relatively stable state will due to construction of a disturbance break and go through a period of time again re-enter the stability, in this process, stress of surrounding rock redistribution phenomenon can also occur. At the same time, a large number of engineering practice shows that groundwater has a great impact on the underground engineering, because of the role of groundwater, the engineering accidents often occur. Because the rock is a deformable porous medium, the surrounding rock is disturbed in stress redistribution in the process, the surrounding rock will occur deformation, and the deformation of surrounding rock will directly affect the pore structure of the rock mass, which leads to the change of inner pore of rock, groundwater seepage flow path change and fluid flow field affected. At the same time, the change of the fluid flow field can also affect the stress field of rock mass.In this paper, as the engineering background of Tarangaole auxiliary shaft ingate, through numerical calculation. Analysis of the rock instability mechanism, and specific analysis of the rock buried depth, rock porosity and coefficient of lateral pressure and rock pore water pressure on the stability of surrounding rock influence. The results showed that under the action of fluid solid coupling, the rock buried depth and pore water pressure on the surrounding rock stability of larger, in the project should pay special attention to them. At the same time, this paper also for Taramgaole auxiliary shaft ingate surrounding rock stability were numerical calculation and analysis of monitoring data, results show that, to design a supporting schemes can satisfy the requirements of the stability of surrounding rock and structure safety reliable.In the end, the creep characteristics of surrounding rock and the creep curve of rock are combined with the creep curve. The results show that the deformation of the tunnel is best controlled by two times during the constant creep stage and the safety of the structure is also good. The related conclusions can provide some reference value for the future engineering practice.