Study On The Effect Of Deep Seepage In Discontinuous Jointed Rock Mass On Tunnel Stability

With the development of national economy and the improvement of science and technology, the exploitation and utilization of shallow mineral resources has been far from satisfying the needs of people. Hence, the coal mining have to transfer from ground to underground and from shallow to deep mining exploitation. However, there are more and more difficulties bud in the deep mining exploitation. It is harmful to the mine workers because of the complex deep mining environment such as high stress,high temperature, high osmotic pressure and strong disturbance. Rock as a non-uniform natural substances, include the joint, cracks and so on the complex geometrical properties. These weak medium structures can impact on the seepage flow stress coupling mechanism, finally, can affect the stability of surrounding rock.Therefore, the research of high stress, seepage water pressure and fracture structure on the stability of the tunnel in the deep discontinuous jointed rock is very necessary.In this paper, use the real coupling analysis system RFPA2D-flow to simulation analysis the process of deep mining in complex geological structure and engineering environment and so on. The specific research contents are following:(1)According to the current research of deep tunnel seepage in fractured zone is complete, not the fit engineering model, and the imperfect monitoring data. Extensive collection the literatures at home and abroad, collect and extract the useful information, determine the model parameters and construct the numerical model.(2)Simulation analysis the stability of tunnel under high stress in the deep mining,contains the fracture model of surrounding rock, the distribution of stress field, the process of crack development and the acoustic emission distribution in rock instabilityetc.(3)Numerical simulation the failure process under the seepage-stress coupled effect in the joint rock, study the process of propagation and coalescence in the discontinuity crack from the other sides. It is helpful to correct understanding the interaction mechanism of rock mass fracture and flow.(4)Numerical simulation the intermittent joint weak structural plane in the deep tunnel, analysis the safe stability under the seepage-stress-damage coupling effect, the results are very important significance to evaluate the safety and stability in the deep tunnel under complex environment.(5)Analysis of the common security measures of seepage flow fractured zone in deep tunnel.All in all, in this paper, some conclusions and achievements has been established through the simulation model, has certain value of theory and application to the research of stability in the intermittent joint rock mass and seepage-stress-flow coupling mechanism, to provide the reference for safety protection method in deep tunnel seepage fractured zone.