摘要
对于盾构隧道施工产生的地表沉降的预测及控制一直是工程界亟待解决的难题.依托南京市地铁3号线明发广场站～绕城北区间隧道的工程实例,运用地层损失理论及现场监测等手段进行了盾构隧道沉降分析,并对其沉降控制措施进行了研究,结果表明：盾构隧道施工过程中引起的地层损失是导致地表沉降的主要原因;地层损失理论中的Peck公式适用于黏土层和砂岩层中盾构隧道沉降预测,其精确度满足工程要求.盾构隧道沉降的影响因素较多,且在整个盾构施工过程中各个阶段产生的沉降机理、规律各不相同.通过注浆加固、严格控制盾构机姿态、管片组装质量可减小地应力损失,减小盾构施工引起的地表沉降.所得结论对于类似工程有极大借鉴意义.
It is a difficult problem to predict and control the settlement of the shield tunnel construction. By the engineering example of the Nanjing UMT line 3 Mingfa square - circle city north running tunnel is supported, used the ground loss theories and field monitoring to analyze the shield tunnel settlement and research the settlement con- trol measure. The results show that the main reason of causing settlement is ground loss; the Peck formula applies to predict settlement in clay layer and sandstone formation, its accuracy satisfies the requirement; the influencing factors of shield tunnel settlement is major. The settlement mechanism and rule are different in the whole construc- tion process. The grouting reinforcement, controlling the shield posture and controlling the assembly quality could decrease the ground loss and the settlement. The conclusion has a great reference for the similar projects.
出处
《科学技术与工程》
北大核心
2013年第32期9569-9573,共5页
Science Technology and Engineering
基金
山西省交通运输厅科研项目(2012-1-1)资助
关键词
地层损失
盾构隧道
沉降
控制措施
ground loss shield tunnel settlement control measure
