Jinfeng Tunnel Project for the 8B Contract Section of Xinxu Expressway in Hunan Province

Xinxu Expressway is the third horizontal in the expressway network of "five verticals and seven horizontals" in our province. The Jinfeng Tunnel in this project is a project-controlling project. The left line is 362m long and the right line is 368m long. It is a tunnel with a small clear distance. The surrounding rock of the cave is mainly composed of moderately weathered argillaceous limestone. The joints and fissures are relatively developed, the rock quality is soft, and the stability of the surrounding rock is poor. The slope direction is opposite, the drainage is not effective, and the construction is difficult. The company's construction personnel overcome difficulties, complete the construction tasks with quality and quantity, and contribute to the promotion of resource development in central Hunan and the implementation of the strategy of "developing western Hunan".