地铁黄土地层中盾构隧道地表沉降控制技术研究

Control Technology in Loess Strata Metro Shield Tunnel Surface Settlement

地铁盾构施工技术在黄土地层中应用广泛。但由于黄土地层结构复杂,使得地铁盾构施工技术存在很多安全隐患。地铁盾构隧道地表沉降控制技术与盾构安全施工紧密联系,因此,对地铁黄土地层中盾构隧道地表沉降控制技术研究极具实用价值。以西安地铁为研究对象,首先基于土力学理论,对引起地铁黄土地层中盾构隧道地表沉降的因素进行分析,然后利用半解析法以及数值分析法分析各因素对地表沉降的影响规律。在此基础上,提出了隧道施工穿越古城墙的新方法,增强了土体力学性能参数,提高了经济效益,降低了地铁盾构隧道地表沉降现象。为西安未来地铁隧道施工的发展提供借鉴,也为已有隧道技术提供了新的模式。

The construction of subway shield technology is widely used in loess strata. However,due to the complex structure of loess formations,makes the construction of metro shield technology,and lead to many security risks. Metro Shield Tunnel Shield surface subsidence control technology is close to safety construction,therefore,the subway tunnel shield loess strata surface subsidence control technology very practical value. Taking Xi＇ an Metro for the study,first based on soil mechanics theory,analyze the factors of leading to the formation of loess subway tunnel shield surface settlement,and then analyze the influence of various factors on the surface subsidence using semi-analytical method and numerical analysis. On this basis,we propose a new method of tunneling through the ancient city wall,and enhance the physical properties of soil parameters,improve economic efficiency and reduce the surface subway shield tunnel subsidence phenomenon. Not only provide a reference for future development of Xi＇ an metro tunnel construction,but also provide a new model of existing tunneling technology.