### Law of horizontal deformation displacement of tunnels due to adjacent excavation

LI Lianxiang1,2, ZHANG Qiang1,2, SHI Jinjiang3, LIU Jiadian1,2, HOU Yingxue1,2

1. 1. Foundation Pit and Deep Foundation Engineering Research Center, Shandong University, Jinan 250061, Shandong, China;
2. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China;
3. Jinan Rail Transit Group Co., Ltd., Jinan 250014, Shandong, China
• Published:2021-03-01

Abstract: The horizontal displacement of the tunnel hance was divided into three parts. Based on the change of horizontal coefficients of subgrade reaction, the paper proposed the concept of “horizontal deformation displacement”, which was analyzed by the PLAXIS 3D. And the correlation formula between the maximum horizontal deformation displacement and the foundation pit width and the horizontal distance was obtained by fitting. The results showed that the horizontal deformation displacement decreased exponentially with the increase of the horizontal distance between the tunnel and the foundation pit, and the influence of the foundation pit width was ignored when the value of the horizontal distance was greater than the depth of the foundation pit. The formula derived in this paper could be used to calculate the horizontal convergence value of the tunnel adjacent to the excavation, the horizontal displacement of the tunnel hance, and the horizontal coefficients of subgrade reaction near the tunnel.

CLC Number:

• U45