摘要
利用泥水盾构隧道开挖面平衡稳定原理,对泥水介质渗透的微观机理进行分析。同时,以具体工程为研究对象,结合流固耦合基本原理对由于开挖面泥水渗流所引起的隧道开挖位移场进行计算分析。研究结果表明:泥水介质向开挖面前方土体渗流时,将引起隧道地表附加沉降,且泥水压力大于主动土压力时,泥水压力越大,附加沉降量越大,但总沉降量越小;泥膜渗透系数越小、泥膜厚度越大附加沉降越小;适当增加施工进度有助于减少附加沉降。因此,在高渗透性地层条件下采用泥水盾构施工时,应确保泥水介质的质量,适当提高施工进度,尽量减少泥水渗透对开挖面稳定性及地表变形的不利影响。
Based on the principle that slurry shield maintaining the stability of tunnel face, the micro mechanism of slurry infiltration was explored. The ground surface settlement due to slurry infiltration of slurry shield tunneling was analyzed using fluid-solid coupling theory. The results show that penetration of slurry into front soil in tunnel face results in additional ground surface settlement, which increases with the increase of the slurry pressure that is no less than earth pressure at rest （but the total settlement decreases with the increase of the pressure） and permeability coefficient of filter cake, decreases with thickness of filter cake. The appropriately increasing of construction schedule helps to reduce additional surface settlement. Therefore, while tunneling in highly permeable ground with slurry shield, the slurry quality should be ensured to reduce the excess water pressure. In addition, the construction schedule should also be appropriately increased to minimize the adverse effects of the slurry infiltration on the stability of tunnel face and the surface deformation.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第2期785-791,共7页
Journal of Central South University:Science and Technology
基金
湖南省教育厅重点研究项目(09A016)
上海市博士后基金重点资助项目(08R214210)
关键词
泥水盾构
泥浆渗透
地表变形
流固耦合
slurry shield tunnel
slurry infiltration
surface deformation
fluid-solid coupling theory
