基于围岩应力变化率确定盾构隧道竖向荷载的等效荷载高度取值方法  

Equivalent Load Height Determination Method for Shield Tunnel Vertical Load Based on Surrounding Rock Stress Change Rate

作　　者：何林根 黄钟晖 康潇月 刘昊 吕林海 姚超凡[1] 王士民[1] HE Lingen;HUANG Zhonghui;KANG Xiao-yue;LIU Hao;LYU Linhai;YAO Chaofan;WANG Shimin(Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,610031,Chengdu,China;Nanning Rail Transit Co.,Ltd.,530029,Nanning,China)

机构地区：[1]西南交通大学交通隧道教育部重点实验室,成都610031 [2]南宁轨道交通集团有限责任公司,南宁530029

出　　处：《城市轨道交通研究》2025年第4期182-190,共9页Urban Mass Transit

摘　　要：[目的]现有复杂地质条件下,盾构隧道荷载模式与计算方法的适用性和精确性存在不足,有必要基于围岩应力变化率确定盾构隧道竖向荷载等效荷载高度的取值。[方法]根据相似地层条件下已建盾构工程,提出一种基于围岩荷载临界应力变化率确定竖向荷载的方法。结合南宁地铁5号线盾构隧道工程,开展越江盾构隧道穿越土岩复合地层竖向荷载取值方法以及影响因素对竖向荷载变化规律的研究。[结果及结论]基于相似地层条件的已建盾构工程,以围岩荷载临界应力变化率参考值取2%为确定竖向荷载高度取值的依据。数值计算结果表明,埋深对等效荷载高度的影响显著,地下水赋存情况对于等效荷载高度的影响相对较小。[Objective] The applicability and accuracy of the load modes and calculation methods of shield tunnels under existing complex geological conditions are insufficient.It is necessary to determine the equivalent load height value of the shield tunnel vertical load based on the surrounding rock stress change rate.[Method] Based on the built shield tunneling project under similar stratigraphic conditions,a method for determining vertical load based on the critical stress change rate of surrounding rock load is proposed.Combined with the shield tunnel project of Nanning Metro Line 5,the vertical load value method of the cross-river shield tunnel passing through the earth-rock composite strata and the influencing factors on the vertical load change law are studied.[Result & Conclusion] Based on the built shield projects with similar stratigraphic conditions,a reference value of 2% is taken as the critical stress change rate of the surrounding rock load to determine the vertical load height value.The numerical calculation results show that the influence of burial depth on the equivalent load height is significant,while the influence of groundwater occurrence on the equivalent load height is relatively smaller.

关 键 词：地铁 盾构隧道 应力变化率 等效荷载高度 

分 类 号：U451[建筑科学—桥梁与隧道工程] U455.43[交通运输工程—道路与铁道工程]