穿越城区连拱隧道合理施工工法研究

发布时间：2018-03-03 05:10

本文选题：连拱隧道　切入点：施工工法　出处：《铁道标准设计》2017年10期 　论文类型：期刊论文

【摘要】：以重庆市沙坪坝区的站西站东路下穿道工程为依托,深入研究穿越城区连拱隧道的合理施工工法,从沉降、结构、施工、经济性等方面对比台阶法和CD法,并优化CD法的施工工序,确定对沉降变形起控制作用的施工关键工序。结果表明:修建穿越城区的连拱隧道,采用CD法引起的拱顶及地表沉降量、支护结构承受的最大拉压应力及围岩坍塌范围较台阶法大幅减少;优化后的CD法在控制沉降、结构受力、施工组织方面具有综合优势,其在施工中对地表及拱顶沉降起控制作用的关键工序对相应部位的拱顶及地表累计沉降的影响比重均达到10%以上。
[Abstract]:Based on the project of the East Road of the station west of Chongqing Shapingba District, this paper deeply studies the reasonable construction method of crossing the multi-arch tunnel in the urban area, and compares the step method with the CD method from the aspects of settlement, structure, construction and economy, etc. The construction procedure of CD method is optimized to determine the key construction procedure which can control the settlement and deformation. The results show that the construction of multi-arch tunnel through urban area, the amount of arch roof and surface subsidence caused by CD method, The maximum tensile and compressive stress and the surrounding rock collapse range of the supporting structure are greatly reduced compared with the step method, and the optimized CD method has comprehensive advantages in controlling the settlement, bearing the force of the structure, and organizing the construction. The key processes of controlling the settlement of the earth's surface and vault in construction have an effect of more than 10% on the corresponding part of the vault and the accumulated settlement of the earth's surface.
【作者单位】：西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;成都市双流区政府投资项目评审中心;
【基金】：中国铁路总公司科技研究开发计划项目(2014G010) 重庆市应用开发计划重点项目(cstc2014yykf B30003)
【分类号】：U455.4

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