doi:10.16186/j.cnki.1673-9787.2020030070

Received:2020/03/21

Revised:2020/10/15

Published:2022/01/10

Influence analysis of soil reinforcement range on existing shield tunnels orbital

MENG Qingkun , XU Guoyuan

School of Civil Engineering and Transportation， South China University of Technology， Guangzhou 510641 ， Guangdong， China

Abstract: In order to analyze the influences of different vault，arch bottoms and different transverse soil reinforcement ranges on the existing tunnel track and rail height difference，the Midas-gts finite element software was used in combination with the on-site construction，and based on the existing shield tunnel construction influence mechanism of the disturbance range，the project of a shield tunnel in Guangzhou obliquely crossing Line 11 was studied． The results showed that the settlement curve of the existing track was a“V”shape and the rail height difference curve was a“W”shape; Within a certain range，lateral soil reinforcement controls effect of the height difference between the track and the track was significant，and when the lateral reinforcement was 1D( D was the shield diameter) ，the control effect of the height difference between the existing track and the track was obvious; The maximum settlement of the existing track and the vault，the vault + arch bottom and the lateral reinforcement range had a logarithmic linear relationship with the arch bottom reinforcement range; The shield tunnel disturbance range was approximately 1D from both sides of the existing tunnel; The disturbance range of the shield tunnel was roughly within 1D on both sides of the existing tunnel． Therefore，the 1D range of soil on both sides of the shield tunnel was reinforced to prevent large deformation of the tunnel structure.

Key words:shield tunnel;rail height difference;finite element analysis;soil reinforcement difference

 土体加固范围对既有盾构隧道轨道的影响分析_孟庆坤.pdf