Study On Mechanics Characteristic Of Large Span And Neighborhood Tunnel Supporting Structure

The seepage field and stress field of Fractured Rock Mass coupling theory is a hot a difficulty issue in the recent year at home and abroad. Especially for the specialty of long and deep tunnel engineering, Tunnel through hydrogeological conditions is more complex, excavation of tunnel, cause stress redistribution around the Rock, At the same time also damaged underground fissure water seepage path of the original, The change of the power of the rock underground fissure water. therefore, This problem of in-depth study on the safety of the project has a very important practical significance. This paper based on Chongqing municipal key project——the monitoring of Shuangbei tunnel project, launch the following job;①Introduced the basic characteristics of the fractured rock mass seepage、The fractured rock mass of the seepage flow continuity equation, The fractured rock mass permeability basic differential equation theory and so on, The fractured rock mass seepage field and stress field of the interaction mechanismand double field under the coupled action of the distribution of stress;②Using finite difference software of FLAC3D, set up different fracturedrock mass model of underground water level in the excavation process of themechanical properties of the rock and primary support, and comparative analysis Different of underground water level of the fractured rock mass by numerical simulation;③Comparative analysis the site monitoring results and different excavation of the fractured rock mass by numerical simulation, judge the rationality of the numerical simulation results. The result of this paper for tunnel construction has certain reference resource significance;...