Research Of The Stability And Reinforcement Of The Soil-rock Foundation Tunnel Structure

With the progress of the tunnel project, the case that a series of various differentgeological conditions gathering has become more often. Earth-rock aggregate is a verycommon rock-soil body. It has negative effects on tunnel project which is mainly thewhole or partial tunnel subsidence, the extrusion or the floor heave because of thesufficient of subgrade bearing capacity, and a series of side damages because of these.When the tunnel is located in these kind of geological foundation, if handled improperly,it may cause problems and harm to the practical engineering.The thesis is based on a practical project, studying on supporting structure stabilityand reinforcement measures of soil-rock foundation tunnel by site investigation,theoretical research and numerical simulation. To carry out the work are as follows:①Collecting the relevant information of the tunnel such as survey, design,construction, etc. analyzing and investigating the cracking situation of the supportstructure.②We obtained the mechanical parameters of the soil-rock foundation through thenumerical modeling experiment. Using MATLAB command procedures combined withCAD to generate stochastic model of earth-rock aggregate and importing into theFLAC3D to do the three-axis numerical simulation experiment. Finally, according tothe results of the numerical simulation data, we know elastic modulus, cohesion,internal friction angle and Poisson’s ratio.③Using GTS to simulate the stability of the supporting structure of the soil-rockfoundation tunnel, stratum structure method and load structure method to simulate thestability of tunnel support structure under the current situation of the tunnel backfill andthe completion of the tunnel backfill. According to the result of simulation analyze thereason why tunnel cracks, and compare with the actual conditions.④Combined with the actual situation on tunnel and the theoretical analysis ofprevious experience. Determine the tunnel support structure reinforcement scheme.Numerical analyzing the reinforcement scheme, comparing with the result ofnon-reinforcement condition, and assess the effect of reinforcement.