大直径盾构下穿大量老龄浅基民居沉降控制研究

发布时间：2018-07-01 20:18

本文选题：盾构下穿 + 密集建筑物　；参考：《长安大学》2017年硕士论文

【摘要】：随着盾构法施工的日渐成熟,盾构线路的选择从最初的适合软土地层,逐步发展为适合各类地层的施工,从常规的沿空旷地带以及城市道路下前行,发展为沿地面环境复杂、地面建筑较多的地下敷设。随之而来,各种盾构施工问题也随之显现,施工难度逐渐加大,对地面、房屋沉降的要求也随之提高。为此,如何抑制沉降,确保盾构施工中上方建筑物的安全,是盾构施工技术中重点解决的问题。莞惠城际某标段穿越地质多变的复合地层,地层自上至下依次为素填土、淤泥质粉质粘土、粉质粘土、全风化、强风化及弱风化混合片麻岩,隧道下穿大朗镇黎贝岭村、巷尾、巷头以及大井头村,上覆建筑物密集,覆盖率达90%以上,多为七八十年代老龄浅基民居,施工难度大,安全风险高。论文以莞惠城际某标段盾构施工为基础,通过现场实际效果及理论分析,总结出盾构下穿大量老龄浅基民居沉降控制的关键技术。论文通过研究项目地层地质环境等综合因素论述了盾构机选型的基本特征,针对复合地层下穿密集房屋群的特征因素,通过对房屋主动注浆及跟踪注浆加固、各地层掘进参数控制、盾构机通过特殊地质段、复合地层泥膜保压、盾构下穿繁华老城区的地面安全管理工作的研究,通过采用监控量测信息化指导方法,进行盾构掘进的管控及预控,从而实现了大直径盾构下穿大量老龄浅基民居过程中的安全稳定,为今后类似工程提供经验。
[Abstract]:With the increasing maturity of shield construction, the selection of shield road line from the initial suitable for soft soil layer, gradually developed into suitable for all kinds of strata construction, from the conventional along the open areas and urban roads, the development of complex ground environment, Underground laying with more ground buildings. Subsequently, various kinds of shield construction problems also appear, the construction difficulty increases gradually, the ground, housing settlement requirements are also raised. Therefore, how to restrain the settlement and ensure the safety of the buildings above the shield construction is an important problem to be solved in the shield construction technology. A certain section of Guanghui city passes through the complex strata with changeable geology. From top to bottom, the strata are plain fill, silty clay, total weathering, strong weathering and weak weathering mixed gneiss. Under the tunnel, it passes through Libeling Village, Dalong Town, and ends the roadway. The overlying buildings in Xiantou and Dajingtou villages are overlying with coverage of more than 90%. Most of them are old and shallow base houses in the 1970s and 1980s. The construction is difficult and the safety risk is high. Based on the shield construction of a certain section of Guanhui city, the paper summarizes the key technology of settlement control of a large number of residential buildings with shallow foundation under shield tunneling through the actual results and theoretical analysis on the spot. In this paper, the basic characteristics of shield machine type selection are discussed by studying the comprehensive factors such as the geological environment of the project, and aiming at the characteristic factors of the dense building group under the composite stratum, the active grouting and tracing grouting are used to reinforce the building. Research on the parameter control of tunneling in different places, shield machine through special geological section, compound layer mud film to keep pressure, ground safety management work under shield tunneling through prosperous old urban area, through adopting information guidance method of monitoring and measurement, The control and pre-control of shield tunneling are carried out to realize the safety and stability in the process of large diameter shield tunneling through a large number of aging shallow residential buildings, which provides experience for similar projects in the future.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43;TU433

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