特大基坑对市域铁路安全风险及影响分析
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摘要
特大基坑施工易给周边环境敏感要求较高的市域铁路带来不利的安全影响,基坑围护应根据周边环境不同进行分段设计,临近市域铁路段采用混凝土斜撑与斜包撑进行支护,并结合基坑分块分段施工及时施加支撑体系,减少基坑无支撑防护时间,加固基坑主动区的土体,减少水土流失。采用数值计算方法对基坑开挖时温州市域铁路S1线桥台及周边站房的影响进行分析,结果表明,可知该方案对市域铁路的影响可控,设计合理。
The large foundation excavation will likely induce adverse effect on the operation of the adjacent rail transit, which is sensitive to the vibration and deformation. The design of the supporting structure for the foundation excavations near the rail transit should consider the site-specific environments. In this paper, a case history of the deep excavation near a rail transit line in Wenzhou is presented. The supporting for the proposed excavation area near the transit line was designed by using reinforced concrete rakers and earth berm support. Further, zoned excavation and temporary supporting system. Other effective methods, such as, reduce the time for the unsupported excavated area, ground improvement at the passive earth pressure zone at the bottom of excavation and minimize the soil erosion, could also considered. The paper also presents a numerical study results of foundation excavation effect on the transit bridge abutment of Line S1 and other adjacent train station structures.
The large foundation excavation will likely induce adverse effect on the operation of the adjacent rail transit, which is sensitive to the vibration and deformation. The design of the supporting structure for the foundation excavations near the rail transit should consider the site-specific environments. In this paper, a case history of the deep excavation near a rail transit line in Wenzhou is presented. The supporting for the proposed excavation area near the transit line was designed by using reinforced concrete rakers and earth berm support. Further, zoned excavation and temporary supporting system. Other effective methods, such as, reduce the time for the unsupported excavated area, ground improvement at the passive earth pressure zone at the bottom of excavation and minimize the soil erosion, could also considered. The paper also presents a numerical study results of foundation excavation effect on the transit bridge abutment of Line S1 and other adjacent train station structures.
引文
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[2] 姜浩.高速铁路桥梁墩台工后沉降分析与计算[D].北京建筑大学,2016.
[3] 温州市轨道交通S1线开通试运营[J].现代城市轨道交通,2019(2):86.
[4] 徐斌,裴伟伟,许振巍.温州滨江广场二期深基坑工程实例分析[J].工程质量,2016(8):68-72.
[5] 蔡晓荣.单排桩支撑体系在软土地基超大深基坑支护中的应用[J].建筑施工,2018,40(6):830-832+849.
[6] 刘晨,饶运东,许开军,等.基于MADIS/GTS的基坑复合土钉墙支护效果模拟分析[J].岩土工程学报,2012,34(S1):217-221.
[7] Chen Liu,Jichao Zhang,Keyi Wang.Technology of preventing the metro tunnel disaster caused by overhead excavation in underground space[J].Advanced Materials Research,2011.
[8] 王鑫.盾构施工下穿长春火车站南站房影响研究及控制措施[D].吉林建筑大学,2017.