摘要
以杭州地铁三号线小和山站暗挖段隧道工程为背景,基于Pasternak弹性地基梁理论及数值模拟计算,研究了软弱破碎地层CRD法施工过程中管棚的挠度变化和地表沉降规律。研究表明,开挖面处管棚挠度最大,管棚挠度变化曲线呈“凹”型;管棚支护下地表沉降值约为无管棚支护的1/4;有管棚工况下,隧道上断面开挖时地表沉降速率远大于下断面开挖时。从理论与计算层面均证明了浅埋松软地层中管棚注浆加固技术的优越性。
In this paper,based on the tunnel engineering of the subsurface excavation section of the Xiaoheshan Station of Hangzhou Metro Line 3,based on the Pasternak elastic foundation beam theory and numerical simulation calculations,the deflection changes and surface settlement laws of the pipe-roofs during the CRD method construction in weak and fractured formations are studied.Research shows that the deflection of pipe shed at the excavation surface is the largest,and the curve of pipe shed deflection is"concave";the surface settlement under pipe shed support is about 1/4 of that without pipe shed support;Under the condition of pipe shed,the surface settlement rate during the excavation of the upper section of the tunnel is much greater than that of the lower section.Both theoretical and numerical calculations have proved the superiority of the pipe roof grouting reinforcement technology in shallow-buried soft ground.
作者
董凌岳
杨克形
麻超
刘世奇
Dong Lingyue;Yang Kexing;Ma Chao;Liu Shiqi(School of Civil Engineering,Zhejiang University of Technology,Hangzhou 310032,China;The Third Engineering Co.,Ltd.of China Railway Seventh Group,Xi'an 710032,China)
出处
《北方交通》
2021年第5期79-83,共5页
Northern Communications
关键词
弹性地基梁理论
软弱破碎地层
管棚支护
CRD法
地表沉降
Elastic foundation beam theory
Weak and broken stratum
Pipe-roofs support
CRD method
Ground settlement
