Simulation Study on Surrounding Rock Deformation of Strongly Weathered Sandstone Tunnel Supported by Pipe Shed

Abstract Strongly weathered sandstone belongs to the category of soft rock and is easily deformed and damaged during tunnel excavation. In order to explore the control effect of the pipe shed advanced support on the deformation of the strongly weathered sandstone tunnel. This paper uses FLAC3D software to simulate the excavation and support of strongly weathered sandstone, and compares the deformation before and after the support. Through analysis and research, it is found that the pipe roof support has greatly improved the amount of deformation and horizontal convergence of the tunnel vault. The dome subsidence and horizontal convergence are reduced from 162mm and 126mm to 19mm and 13mm respectively, and the reduction is 143mm and 113mm respectively. It can provide experience for similar projects in the future.