Abstract:

Based on the analysis of the gypsum breccia ground in Z5 bid section of Taihangshan tunnel on ShijiazhuangTaiyuan passengerdedicated railway, the authors summarize the compositions and engineering characteristics of the gypsum breccia ground and make classification of the ground. Due to the engineering characteristics and risks of the gypsum breccia ground, corresponding construction schemes and construction methods are adopted. After comparison and contrast, "top heading and bench" excavation method is selected, which solves the problem of swelling, collapse and large deformation easy to occur during construction and ensures safe and rapid tunneling. This paper can provide reference for similar projects in the future.

Key words: gypsum breccia, engineering characteristics tunnel construction