Study On Tunnel-Landslide Interaction During Tunnelling Through Landslide

China is a mountainous country. Corresponding to this, the disasters of landslide happen continually. Especially, with land being highly utilized this years, it's impossible to avoid landslide field totally when constructing freeways. Sometimes, because of certain reasons, the tunnel will go through or even go across the landslide. However in nowerdays, there is a lack of correlative researches on constructing tunnel across the landslide. And the experience of construction which can be used for reference is also limited. So, this thesis is about to be combined with the Suan Shui Wan road tunnel and Shan Shen Miao road tunnel, and will make a study on the construction program of road tunnel going through landslide.By using the FEM procedure of ANSYS, construction simulation of Suan Shui Wan road tunnel and Landslide simulation is conducted. Then this thesis draws the conclusion in process of tunnel construction on the following factors: the variational rule of primarily lining,the characteristic rule of horizontal displacement and stress of landslide,changing regulation of rim displacement.And this thesis analyzes the mutual variational rule between the landslide and tunnel, and also analyzes the reasonable construction method.This thesis also calculate the landslide safety factor by using the shear strength reduction method(SRM) with FEM. With the c-tanj reduction, the FEM model of landslide reaches instability, and the value of the nodal displacement just after slope failure has a big jump compared with that before failure. This actually means that no stress distribution can be achieved to satisfy both the yield criterion and global equilibrium. Slope failure and numerical non-convergence take place at the same time. So non-convergence in finite element program can be taken as a suitable evaluation criterion of slope failure. The safety factor is then obtained by c-tanj reduction algorithm.