Abstract:

Taking the construction of the entrance section of Gangcheng tunnel of SJSV bid section on TaiyuanZhongweiYinchuan railway as an example, the authors discuss the rapid construction of tunnels in new loess ground in this paper. Sequential excavation is executed in new loess ground, which minimizes the deformation of the surrounding ground and the primary reinforcement and eliminates the need to install temporary support. In addition, sequential excavation method can solve the traditional problem of restricted working space induced by installing temporary support in new loess ground. The construction scheme is optimized, effective countermeasures are developed, ordinary equipments are allocated, which results in rapid construction of the tunnel in new loess ground.