地铁盾构法施工引起的地表沉降分析研究

发布时间：2018-06-08 12:28

本文选题：盾构法 + 隧道　；参考：《西安工业大学》2017年硕士论文

【摘要】：城乡一体化进程的逐步加快导致各大城市人口激增,城市交通面临严峻挑战。为解决城市的交通压力,地铁建设势在必行。盾构法以其施工安全、操作便捷等优势,得到全面的推广与应用。但此法施工会引发地层损失,严重时,则会造成地表塌陷、管线破裂、墙体裂缝等不良现象,影响周围环境。本文以西安地铁A站到B站区间隧道盾构施工为背景,对盾构掘进引发的地表沉降进行了分析。首先总结已有研究成果,对现场地表沉降观测数据进行梳理;然后利用有限元软件MIDAS/GTS模拟盾构掘进施工工艺,得出隧道开挖完成后的沉降数据,并结合现场地质条件、设计情况及施工参数等分析隧道盾构法施工引起地表沉降的一般规律和影响沉降值大小的因素。通过优化施工参数以及施工方案,提出控制地表沉降的有效措施。论文研究得出:(1)隧道上方覆土厚度对地表沉降有明显的影响,沉降量随着覆土厚度的增大而减小。在相同的覆土厚度下,埋深越大,地层的横向最大沉降量越大。(2)纵向地表沉降受掘进压力的影响较大,沉降量随着掘进压力的增大而减小。(3)采用等代层来模拟盾尾注浆时,等代层的弹性模量取值对地表沉降影响较小,而等代层的厚度对地表沉降有显著影响。(4)双线隧道施工时,不同的开挖方式所引起的地表沉降量相差甚微。先左线、后右线的开挖方式由于沉降叠加效果,使得两隧道中心沉降量不等。
[Abstract]:The accelerating process of urban and rural integration has led to a sharp increase in population in major cities, and urban transportation is facing severe challenges. In order to solve the traffic pressure, subway construction is imperative. The shield method has been popularized and applied in an all-round way because of its advantages of safe construction and convenient operation. However, the construction of this method will cause formation losses, if serious, will cause surface collapse, pipeline rupture, wall cracks and other adverse phenomena, affecting the surrounding environment. In this paper, the ground subsidence caused by shield tunneling is analyzed under the background of shield tunneling between station A and station B of Xi'an subway. Firstly, summarizing the existing research results, combing the observation data of ground surface settlement, then using the finite element software Midas / GTS to simulate the construction technology of shield tunneling, the settlement data after tunnel excavation is obtained, and combined with the field geological conditions, The general law of ground subsidence caused by shield tunneling method and the factors influencing the settlement value are analyzed. Through optimizing construction parameters and construction scheme, the effective measures to control surface subsidence are put forward. In this paper, it is concluded that the overlying soil thickness over the tunnel has an obvious effect on the surface subsidence, and the settlement decreases with the increase of the overlying soil thickness. Under the same overlying soil thickness, the greater the buried depth, the greater the maximum horizontal settlement of the stratum. (2) the longitudinal surface subsidence is greatly affected by the tunneling pressure, and the settlement decreases with the increase of the tunneling pressure, and the equivalent layer is used to simulate the shield tail grouting. The elastic modulus of the same generation layer has little influence on the surface settlement, while the thickness of the same generation layer has a significant effect on the surface settlement. Because of the settlement superposition effect, the settlement of the center of the two tunnels varies from the left line to the second right line.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43;U231.3

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