Affiliation:
1. 1 School of Resources and Safety Engineering Central South University Changsha Hunan 410083 China csu.edu.cn
2. 2 Shenzhen Huiyan Expressway Co. Ltd. Shenzhen Guangdong 518081 China
3. 3 Hunan Polytechnic of Water Resources and Electric Power Changsha Hunan 410131 China
4. 4 Nanning Rail Transit Co. Ltd. Nanning Guangxi China 530028
Abstract
Abstract
Since the safety and stability of the original tunnel structure are easily affected by the adjacent foundation pit excavation, it is strongly necessary to study the deformation evolution of tunnels during the adjacent foundation pit excavation. With regard to the two cases that tunnel is adjacently located at the right and bottom of foundation pit, the influence of different supporting methods, including pile support, bolt support, pile-bolt support, and shotcrete-bolt support, on the tunnel stability was investigated on the basis of the whole excavation process numerical simulation of deep foundation pit for determining the best foundation pit supporting beneficial to the stability of adjacent tunnel. The results indicate that both one-step excavation and multistep excavation have great influences on the displacement of adjacent tunnels, wherein the influences on the tunnel located at the right of foundation pit are greater than those at the bottom of foundation pit. Multistep excavation is recommended for the foundation pit adjacent to shallow tunnel. In the case of the tunnel located on the bottom of the foundation pit, the maximum stress generated around the tunnel is small, the maximum stress area is limited, and the displacement of tunnel monitoring points is also small. For the tunnel located at the right of the foundation pit, the pile-bolt supporting can effectively limit the displacement of soil between the tunnel and the foundation pit, reduce the maximum stress and the maximum stress distribution area, and effectively control the tunnel displacement.
Funder
Project (2021) of Study on Flood Disaster Prevention Model of Nanning Rail Transit
Education Department of Hunan Province
Water Conservancy Science and Technology Major Project of Hunan Province
CRSRI Open Research Program
Science and Technology Hunan Civil Air Defense Research Project
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