The Stability Evaluation Of Tunnel Which Through The Mined-out Area

Goaf problem is an urgent need to resolve new issues in tunnel construction in Mine Highway. In our country, The research about tunnel stability across goaf is very little. In this paper, Shanxi Lingshi goaf tunnel geological conditions as the original mining conditions, the application of ground penetrating radar to carry out both goaf advanced detection and construction detection. On the basis of determining the location of mined-out area and scale.Analysis the mechanism of overlying Split block structure rock "activation". Analysis different locations split paragraph structure of the overlying block of stress state of rock and unstable forms.Use ANSYS finite element method to establish the geological conditions of mining tunnels under the goaf mathematical model of stability analysis. Focus on such factors as the relative position of the mining goaf deep, flat area, space height, the loose overlying lithology and thickness to impact of the tunnel stability. Mining to identify different geological conditions,different tunnel conditions of the tunnel goaf a safe distance of the critical impact, according to an analysis of observation data combined with the stability of support and management of mined-out area and the tunnel construction technology programs.Establish goaf numerical simulation for comprehensive governance program, based on geological conditions surrounding the special section of the tunnel through the mined-out area. During the construction process, detect stress and displacement to the surrounding rock structure, through comparison of the numerical calculation and test results at the scene of the tunnel to evaluate the safety. And theoretical analysis based on reality to finite element Numerical simulation to similar areas goaf tunnel stability.