To explore the ground deformation mechanism after prereinforcement
induced by overlargediameter shield tunneling, a case
study is conducted on a shield tunneling in Jihua west road extension line
crossing underneath a dam. Threedimensional numerical
simulation is conducted to examine the ground settlement control effect by
various ground reinforcement schemes. Findings are as follows: (1) The soil
deformation is effectively controlled by prereinforcing the soil above the
shield tunnel, and the maximum surface settlement decreases by approximately
50% after the ground reinforcement. (2) The optimal reinforcement depth is
reinforcing to the bottom of the tunnel by jet grouting piles. However, the
three different reinforcement depths to the arch, the arch waist, and the arch
bottom have similar control effects on the ground deformation, which can be
rationally selected based on the principle of economy and efficiency. (3) The
different reinforcement lengths along the shield advancing direction affect the
deformation of reinforced area, thus, the reinforcement area can only be
determined according to the crossing length.
LI Zhifeng, JIANG Jun, WEN Yuqin, SU Dong, ZENG Guodong, YANG Tengyu, YU Hongxin
. ThreeDimensional Numerical Simulation of
Reinforcement of Dam Crossed by OverlargeDiameter Shield Used in Jihua West Road Extension Line#br#[J]. Tunnel Construction, 2023
, 43(S2)
: 122
-128
.
DOI: 10.3973/j.issn.2096-4498.2023.S2.013
