土岩复合地层浅埋暗挖车站拆撑方案优选分析

发布时间：2018-01-22 20:53

本文关键词： 土岩复合地层浅埋暗挖地铁车站拆撑　出处：《现代隧道技术》2015年05期 　论文类型：期刊论文

【摘要】：隧道断面内临时格栅或型钢支撑的拆除,会打破结构系统原有的平衡。特别是在大断面浅埋隧道中,如果临时支撑拆除方式和时机不当,会造成初期支护变形过大或局部内力超过承载极限而发生安全事故。文章以某土岩复合地层中大跨度浅埋暗挖车站为例,通过建立三维模型,主要模拟了拱盖法施工的大断面隧道纵向撑拆过程,分析了不同拆撑顺序以及单次拆撑长度对隧道结构的影响。分析结果表明,选择交替拆撑顺序和单次6 m的拆撑长度,对拱顶沉降和地表沉降等周边环境的影响相对较小,施工更为安全。最后根据数值计算结果提出了拆撑引起成地表沉降控制标准的建议值,为以后类似工程提供参考。
[Abstract]:The removal of temporary grille or steel bracing in the tunnel section will break the original balance of the structural system, especially in the shallow tunnel with large section, if the temporary support removal mode and timing is not appropriate. This paper takes a large span shallow underground excavation station in a soil and rock composite stratum as an example to establish a three-dimensional model. This paper mainly simulates the longitudinal bracing process of large-section tunnel constructed by arch cover method, and analyzes the influence of different bracing sequence and single bracing length on the tunnel structure. The selection of alternate bracing order and the length of the single 6 m span has relatively little effect on the surrounding environment such as the dome settlement and the surface settlement. Finally, according to the results of numerical calculation, the suggested values of the control standard for surface subsidence caused by brace removal are put forward, which provides a reference for similar projects in the future.
【作者单位】：中国海洋大学环境科学与工程学院;北京城建设计研究总院有限责任公司;
【基金】：国家自然科学基金资助项目(41202204) 同济大学岩土及地下工程教育部重点实验室开放研究基金资助项目(KLE-TJGE-B1107) 青岛市地铁公司科研课题(SDSITC-0198710)
【分类号】：U455
【正文快照】： 刘涛1黄永亮1雷刚2(1中国海洋大学环境科学与工程学院,青岛266100;2北京城建设计研究总院有限责任公司,北京100037)修改稿返回日期:2014-06-101引言近年来,随着国民经济的快速发展,各大城市人口的急剧增加,城市规模的不断扩大,城市交通也变得拥堵不堪。加之城市发展中土地资源

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