摘要
为了探究盾构开挖面失稳与既有地下管线间的相互影响机制,进一步完善下穿既有管线盾构开挖面失稳扰动理论,结合上海地铁14号线下穿DN3500合流管线的工程背景,通过数值方法,针对下穿既有管线盾构开挖面失稳开展模拟和分析,研究不同工况既有地下管线存在下的开挖面失稳机制以及开挖面失稳对既有管线的影响规律。研究结果表明:既有管线与开挖面相对位置关系不同,其相互影响的范围和程度也不同,当既有管线与开挖面间的水平净距为0.5D时,既有管线对开挖面土体失稳扰动的影响最大,既有管线的存在将明显抑制开挖面失稳往地表的扩展;当既有管线与开挖面间的水平净距为1.0D时,开挖面失稳对既有管线的影响很大,此时既有管线变形很大,且主要以竖向沉降为主。
In order to analysis the interaction mechanism between the instability of shield excavation face and the existing pipeline,and improve the soil disturbance theory of shield excavation face instability under existing pipeline,numerical simulation and analysis on the instability of shield excavation face under the existing pipeline was carried out based on the project of Shanghai Metro Line 14 crossing DN3500 pipeline.The results show that:(1)The relative position relationship between the existing pipeline and the excavation surface is different,and the scope and degree of their mutual influence are also different.(2)When the horizontal clear distance between the existing pipeline and the excavation surface is 0.5 D,the influence of the existing pipeline on the soil disturbance of excavation surface instability is the largest,and the existence of the existing pipeline will obviously inhibit the expansion of the excavation surface instability to the ground.(3)When the horizontal clear distance between the existing pipeline and the excavation surface is 1.0 D,the excavation surface instability has the greatest impact on the existing pipeline,at this time,the deformation of the existing pipeline is the largest,and the main deformation is vertical settlement.
作者
孙廉威
方宇翔
沈雯
Sun Lianwei;Fang Yuxiang;Shen Wen(Shanghai Construction Group Co.,Ltd.,Shanghai 200080,P.R.China;Engineering Faculty,China University of Geosciences(Wuhan),Wuhan 430074,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第S01期278-284,共7页
Chinese Journal of Underground Space and Engineering
基金
上海市青年科技英才扬帆计划(19YF1421000)
上海建工集团股份有限公司重点科研项目(19JCYJ-08)
关键词
既有管线
盾构隧道
开挖面失稳
数值分析
existing pipeline
shield tunnel
excavation face instability
numerical analysis
