摘要
壁后注浆是盾构隧道施工的关键环节,对控制地表变形影响显著。为建立同步注浆引起的地表变形计算理论,在分析同步注浆对隧道周围土体的作用机理的基础上,将同步注浆对地层的压力效应概化为半无限弹性体中的柱形孔扩张问题,采用镜像法导出了同步注浆引起地表变形的计算式。通过一具体实例,分析了影响同步注浆引起地表变形的因素,结果表明:同步注浆引起的地表变形值受注浆压力、隧道埋深、隧道开挖半径、初始水土压力、土体弹性模量、泊松比等因素影响。
The back-filled grouting is a key step in shield tunnel construction, which has a significant influence on controlling the ground surface deformation. For the purpose of establishing a calculation theory of the ground surface deformation caused by synchronous grouting, the pressure effect of synchronous grouting on the surrounding soils is simplified as an expansion problem of cylindrical cavity in semi-infinite elastic solid. Based on the mechanism analysis of synchronous grouting acting on the surrounding soils, a formula for calculating the ground surface deformation resulting from synchronous grouting is deduced by using the image method. Through a specific example, the influencing factors of the ground surface deformation caused by synchronous grouting are analyzed as well. The results show that the ground surface deformation caused by synchronous grouting is affected by many factors such as grouting pressure, tunnel depth, excavation radius, initial soil and water pressure, elastic modulus and Poisson's ratio of soils.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2014年第4期618-624,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51178052)
关键词
盾构隧道
同步注浆
地表变形
镜像法
shield tunnel
synchronous grouting
ground surface deformation
image method
