Stability analysis of Zhonggong tunnel through coal seam

Xiamen-Chengdu expressway is “the 16th horizontal stroke” of the national reticulated highway system called “7918” which is planned by the country. Ruijin-Ganzhou expressway is a part of Xiamen-Chengdu in Jiangxi province, also a part of “the 4th horizontal stroke” of the main framework highway reticulation called “Three vertical and Four horizontal” in south of Jiangxi. Zhonggong Tunnels is located in Yudou county of Ganzhou City, and near by Shijing village of Hefeng town, which left the tunnel length 4180 m, Right tunnel 4185 meters long, and is the longest highway in Jiangxi Province in the construction of the tunnel. During construction, the tunnel through a coal formation, the emergence of rock instability, severe vault settlement. This paper analyzes the deformation caused by soft coal Tunnel reasons that topography, geological structure, lithology, water´s role and initial support is to generate strong enough deformation of soft ground Tunnel major factor.. The use of the basic principles of mechanics, the establishment of the weak seam digital simulation model of the tunnel; proposed digital simulation of deformation of soft coal Tunnel approach, an example to verify the digital simulation of soft ground tunnel surrounding rock deformation method is correct sex.