新人工填筑土地层超大断面隧道施工导致的地表沉降及其控制措施

发布时间：2018-02-27 12:01

  本文关键词： 新人工填筑土层 超大断面隧道 地表沉降 拱顶沉降 地层固结沉降 控制措施　出处：《中国铁道科学》2017年06期 　论文类型：期刊论文

【摘要】：以贵阳立体交通枢纽工程龙洞堡机场隧道工程为背景,综合运用现场测试、模型试验及数值计算方法,对超厚新人工填筑土地层超大断面隧道施工导致的地表沉降及其控制对策进行研究。基于实测的隧道拱顶沉降,根据既有的计算方法计算拱顶全部沉降;通过室内模型试验和三维数值模拟得到因地层损失引起的地表沉降占拱顶全部沉降的比率;根据拱顶全部沉降和比率计算得到隧道施工导致的地表沉降;再根据实测的地表总沉降,确定隧道施工和土体自身固结分别导致的地表沉降占地表总沉降的比例。结果表明:隧道施工导致的地表沉降是拱顶沉降的35%~36%,占地表总沉降的20%~34%,土体固结导致的地表沉降占地表总沉降的66%~80%,可见土体固结是导致地表沉降的主要因素。由此提出控制地表沉降的主要对策:通过地表钢管桩注浆加固,对土层进行改良;对拱部进行中管棚超前支护;采用大拱脚弧形导坑预留核心土台阶法开挖隧道;设置H175型钢钢架加强初期支护,二次衬砌尽可能地紧跟初期支护施作。
[Abstract]:Based on the project of Longdongbao Airport Tunnel of Guiyang Three-dimensional Traffic Hub Project, the field test, model test and numerical calculation method are used synthetically. In this paper, the surface settlement caused by the construction of super-thick artificial oversized tunnel and its control measures are studied. Based on the measured settlement of the tunnel arch, the total settlement of the arch is calculated according to the existing calculation method. Through indoor model test and three-dimensional numerical simulation, the ratio of ground subsidence caused by ground loss to total settlement of arch roof is obtained, and the surface settlement caused by tunnel construction is calculated according to the total settlement and ratio of arch roof. And then according to the measured total surface subsidence, The results show that the surface settlement caused by tunnel construction and soil self consolidation is 35 / 36 of dome settlement, 20 / 34 of total surface settlement and 20 / 34 of total surface settlement, and the consolidation of soil is caused by consolidation of soil mass. The surface settlement covers an area of 66% 80% of the total settlement. It can be seen that the consolidation of soil is the main factor leading to the surface settlement. Therefore, the main countermeasures to control the surface settlement are put forward: the reinforcement of the surface steel pipe pile by grouting, The soil layer is improved; the arch is supported in advance by the pipe shed; the tunnel is excavated by the method of retaining the core earth step in the arch arch arc; the H175 steel frame is set up to strengthen the initial support; the secondary lining is as close as possible to the initial support.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;西南交通大学陆地交通地质灾害防治技术国家工程实验室;西南交通大学土木工程学院;中国中铁二院工程集团有限责任公司;
【基金】：国家自然科学基金资助项目(51378435) 贵州省科技计划项目(黔科合GZ字[2013]3016)
【分类号】：P642.26;U455.4

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