Large Mountain Response Characteristics Of The Numerical Simulation Of Underground Engineering

The continued development of transport services and the continuous urbanizationprocess, the underground project has been rapid development, both in the areas of road,rail or municipal building, underground works both as an important part of the sky byan irreplaceable role, its regardless of the number or scale are as enormous. However,with the construction of underground works, the impact of its construction projects tothe surrounding environment caused by underground increasingly prominent. As aresult of tunnels and underground coal mining and other projects, making many of theoriginal stable underground environment has been destroyed, and eventually as groundsubsidence, and the subsequent development of the cracks occurred, ground subsidence,surface water resources dropout and other geological disasters. Understand theinteraction of rock and underground engineering is the key to solving these problems,but also to promote development and ensure the safety of the tunnel to be used in depth,an urgent need in-depth study and exploration.In this paper, Banan District, Chongqing rich field for the study, undergroundengineering construction process changes the stress and deformation fields were studiedfor the system. The main contents are as follows:(l) the use of means of MIDAS/GTS numerical simulation of tunnel constructionprocess simulation. Combined with non-linear characteristics of geotechnical materials,elaborated the theory and numerical simulation method of tunnel construction process.According MIDAS/GTS modeling techniques, by determining the physical andmechanical parameters, initial conditions, boundary conditions, material constitutiveelement mesh types, plane geometry model to build the tunnel, and the tunnelexcavation depth is sensitive to different factors were simulated, obtained underdifferent conditions of stress, strain and displacement field distribution;(2)Analysis of variation in rock mass displacements and stresses the mountain, getthe best and worst of tunnel excavation depth, engineering reference for reality to avoidcollapse or subsidence and ground surface geological disasters cracks tunnel.(3) Examples of engineering and technology, law and numerical simulation resultsare compared, in particular distribution, variation of the stress field of the displacementfield, etc., to verify the numerical software MIDAS/GTS reliability, and use it as abasis for the Numerical simulation of multi lithology computational analysis, obtainedunder different lithologies, the impact on the underground construction of themountain.Through these studies, the paper not only rich ore mined-out section of a safetyfactor affecting the stability of the mountain with the systematic analysis of the actualsituation also focused on the numerical simulation analysis, the stress and deformationof the surface has been in-depth study, to evaluate the design of a rich field provides atheoretical basis, to protect the safety of future construction and operation of coal mines on similar projects are also a valuable reference.