多层土中盾构隧道开挖面主动破坏极限支护力  

Active failure limit support force of shield tunnel excavation face in multi-layer soil

作　　者：黄应州 HUANG Yingzhou(Xiamen Shenzhen Railway Guangdong Co.,Ltd,Shenzhen 518052,Guangding,P.R.China)

机构地区：[1]厦深铁路广东有限公司,广东深圳518052

出　　处：《土木与环境工程学报(中英文)》2025年第2期134-140,共7页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(52108300)。

摘　　要：合理设计开挖面主动破坏极限支护力是维持盾构隧道稳定性的关键,目前,大部分主动破坏极限支护力计算方法难以完全适用于复杂盾构隧道工程设计。基于楔形体计算模型,考虑土拱效应影响下的侧压力系数,引入盾构隧道开挖倾角和渗流作用等参数,建立适用于多层土中开挖面主动破坏极限支护力计算模型并推导出解析解;结合实际工程案例,对影响主动破坏极限支护力的土体和设计参数进行分析。结果表明:主动破坏极限支护力随施工深度、地下水水位高度、土体重度和开挖倾角的增大而显著增大,随内摩擦角和黏聚力的增加而非线性减小;采用考虑土拱效应影响的侧压力系数有利于减小主动破坏极限支护力设计值;考虑渗流作用后主动破坏极限支护力显著增加;土层的参数变化对主动破坏极限支护力影响显著。Reasonably designing the active failure limit support force of the tunnel face is the key to maintaining the stability of the shield tunnel.At present,most of the limit support force calculation methods are not suitable for the complex shield tunnel engineering design.Based on the traditional wedge-shaped calculation model and considering the lateral pressure coefficient under the influence of soil arch effect,a calculation model for the active failure limit support force of the tunnel face in layered soil was established by introducing the excavation inclination angle and seepage effect.Combined with a practical engineering case,the soil and design parameters that affect the limit support force were analyzed.The results show that the limit support force of the tunnel face increases significantly with the increase of construction depth,groundwater level height,soil weight and excavation inclination angle,while decreases nonlinearly with the increase of internal friction angle and cohesion;When considering the lateral pressure coefficient under the influence of soil arching effect,the calculated value of the limit support force is reduced;The limit support force significantly increases after considering the effect of seepage;The parameter changes of different soil layers have a significant impact on the limit support force.

关 键 词：盾构隧道 主动破坏极限支护力 土拱效应 成层土 渗流 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]