深圳大学学报（理工版）2024，Vol.41Issue(3)：377-386,10.DOI:10.3724/SP.J.1249.2024.03377
超大直径盾构下穿高铁路基的沉降数值分析
Numerical simulation analysis of settlement for super-large diameter shield tunneling undercrossing high-speed railway subgrade
摘要
Abstract
To explore the settlement characteristics of intercity railway subgrade induced by super-large diameter shield tunneling,taking the Lianghu Tunnel Project in Wuhan as an example,we establish a three-dimensional refined numerical model of the railway subgrade-soil-tunnel by using the finite element software Plaxis.The influences of the ground loss ratio,tunnel face support pressure,and grouting pressure at the shield tail on the settlement law of the intercity railway subgrade above the tunnel are investigated during shield tunneling.The simulation results show that during the process of shield penetration into the composite strata,the surface of the ballast layer of the high speed railroad foundation experiences varying degrees of settlement in the direction of shield tunnel excavation.When the ground loss ratio caused by shield tunneling increases from 1.0%to 1.6%,the maximum settlement of the railway subgrade increases by about 20.4%from 18.86 mm to 22.71 mm.When the tunnel face support force is 0.7 to 1.4 times the lateral static earth pressure of the tunnel vault,the difference in the deformation of the railway subgrade caused by shield tunneling under different tunnel face support pressures is minor(less than 0.67 mm).The grouting pressure obviously influences the settlement of the railway subgrade.As the grouting pressure increases,the settlement of the railway subgrade decreases significantly.When the grouting pressure of the tunnel crown increases to 3 times the lateral static earth pressure of the crown(648 kPa)or more,the maximum differential settlement along the railway subgrade does not exceed the specification requirement(≤5 mm/10 m).The results of the study can provide references for setting excavation parameters for the super-large-diameter shield undercrossing high-speed railway subgrade.关键词
隧道工程/超大直径盾构/盾构施工/下穿铁路/沉降控制/地表沉降/数值模拟Key words
tunnel engineering/super-large diameter shield/shield construction/undercrossing high-speed railway/settlement control/ground surface settlement/numerical simulation分类
建筑与水利引用本文复制引用
娄洪峻,苏栋,林星涛,王雪涛,宋明..超大直径盾构下穿高铁路基的沉降数值分析[J].深圳大学学报（理工版）,2024,41(3):377-386,10.基金项目
National Natural Science Foundation of China(51938008,52090084) 国家自然科学基金资助项目(51938008,52090084) （51938008,52090084）
