摘要
以引汉济渭二期南干线黄土塬盾构隧洞为工程背景,基于浅埋盾构隧道松动土压力理论考虑黄土基本物理特性对土拱效应的影响,推导盾构隧道松动土压力、土拱效应发挥程度理论解,分析松动土压力、土拱效应影响因素的敏感性。结果表明:相比Terzaghi解、黎春林解,考虑黄土抗剪强度、不完全土拱的本文解土压力结果最接近数值解;松动土压力、土拱效应影响因素的敏感性等级依次为盾构半径、地层损失、注浆压力、地表均布荷载、管片刚度,除地表均布荷载与土拱效应发挥程度呈反相关,其余均呈正相关关系;各影响因素下松动土压力与土拱效应变化相同,土拱效应与土压力比均呈线性变化,表明土拱效应可以很好地反映隧道上部土体松动土压力大小;施工质量越好、注浆压力越大、隧道半径越大、埋深越浅,则土拱角度越大、土拱效应越小、管片受到的松动土压力则越大。
Taking the loess shield tunnel of the south main line of the second phase of Hanjiang-to-Weihe River Water Diversion Project as the engineering background,based on the theory of loosening soil pressure of shallow buried shield tunnel and considering the influence of basic physical properties of loess on soil arching effect,the paper attempts to derive the theoretical solution to loosening soil pressure and soil arching effect of shield tunnels,as well as to analyze the sensitivity of influencing factors to loosening soil pressure and soil arching effect.The results show that compared with Terzaghi's Solution and Li Chunlin's Solution,the soil pressure results from the solution proposed in the paper that considering the shear strength of loess and incomplete soil arching effect are closest to the numerical solution.The sensitivity levels of the influencing factors of loosening soil pressure and soil arching effect are in order the shield radius,ground loss,grouting pressure,uniform surface load and segment stiffness.Except that the uniform load on the surface is negatively correlated with the degree of soil arching effect,the rest influencing factors are positively correlated.The variation law of loosening soil pressure is the same as soil arching effect under various influencing factors,and the soil arching effect as well as soil pressure ratio change linearly.It shows that the soil arching effect can well reflect the loosening soil pressure of the upper soil of the tunnel.The better the construction quality,the greater the grouting pressure,and the larger the tunnel radius and the shallower the buried depth,then the greater the soil arching angle,the weaker the soil arching effect,and the greater the loosening soil pressure on the segment.
作者
赵凯
谢良甫
钱建固
晋智毅
马莉
ZHAO Kai;XIE Liangfu;QIAN Jiangu;JIN Zhiyi;MA Li(College of Architecture and Engineering,Xinjiang University,Urumqi 830046;Department of Geotechnical Engineering,Tongji University,Shanghai 200092)
出处
《现代隧道技术》
CSCD
北大核心
2024年第S01期454-465,共12页
Modern Tunnelling Technology
基金
自治区高校基本科研业务费科研项目-培育类项目(XJEDU2023P010)
新疆维吾尔自治区科学技术厅自治区青年基金项目(2022D01C81)
陕西省自然科学基础研究计划-引汉济渭联合基金项目(2021JLM-50)
关键词
黄土隧洞
盾构隧洞
松动土压力
土拱效应
管片受力
Loess tunnel
Shield tunnel
Loosening soil pressure
Soil arching effect
Segment stress
