Abstract A fault fracture zone is one of the common adverse geological phenomena encountered in tunnel projects,
which often results in water inflows, collapses and other disasters. So it is a key risk to be controlled during the construction of tunnels. Taking Wuzhishan Tunnel project as a study case, this paper conducted a research in the grouting and sealing technology for tunnels in the fault fracture zone based on ecological protection. The study results showed that (1) from the perspective of ecological protection, the calculation methods for limited drainage volume to recover the water table in a given period of time were put forward respectively for pre-grouting and post-grouting schemes.In terms of Wuzhishan Tunnel project, the limited drainage volumes to recover the water table in one year was 1.82m3/(d·m) and 0.96 m3/(d·m) respectively for pre-grouting and post-grouting schemes; (2) combined with the limited drainage volume of groundwater and the drainage volume after grounting for surrounding rock, a method was proposed to calculate the grouting ring thickness of surrounding rock. In the pre-grouting and post-grouting schemes of Wuzhishan Tunnel, the grouting ring thickness corresponding to the recovery of water table in one year was 2.07 m and 4.5 m, respectively.
Abstract：
A fault fracture zone is one of the common adverse geological phenomena encountered in tunnel projects,
which often results in water inflows, collapses and other disasters. So it is a key risk to be controlled during the construction of tunnels. Taking Wuzhishan Tunnel project as a study case, this paper conducted a research in the grouting and sealing technology for tunnels in the fault fracture zone based on ecological protection. The study results showed that (1) from the perspective of ecological protection, the calculation methods for limited drainage volume to recover the water table in a given period of time were put forward respectively for pre-grouting and post-grouting schemes.In terms of Wuzhishan Tunnel project, the limited drainage volumes to recover the water table in one year was 1.82m3/(d·m) and 0.96 m3/(d·m) respectively for pre-grouting and post-grouting schemes; (2) combined with the limited drainage volume of groundwater and the drainage volume after grounting for surrounding rock, a method was proposed to calculate the grouting ring thickness of surrounding rock. In the pre-grouting and post-grouting schemes of Wuzhishan Tunnel, the grouting ring thickness corresponding to the recovery of water table in one year was 2.07 m and 4.5 m, respectively.
ZHANG Dewen SU Dingwu
.Study on Grouting and Sealing for Tunnels in the Fault Fracture Zone Based on Ecological Protection[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(3): 46-52
2022, Vol. 59 