Numerical Simulation of the Stability of Front Slope at the Entrance of Tunnel for Cutting Slope

In order to guarantee tunnel construction safe, the stability of the front slope at the entrance of tunnel was improved by cutting slope with anchor, jet concrete and steel net. At first, the geological condition of front slope at the entrance of the tunnel was investigated. Then, the mechanism of cutting slope to improve the stability of front slope was analyzed. At last, the angle and configure of cutting slope with alluviation residual soil was simulated. The result was shown that when front slope angle was more than thirty degrees, it was obvious and feasible to improve its stability through cutting slope. When its angle was less than thirty degrees, cutting slope was not feasible. It was result that the safety factor of front slope was more than one point six and it was safe enough to meet the need of tunnel excavation.