城市地铁隧道开挖对既有管线的影响分析

发布时间：2018-01-03 05:28

本文关键词：城市地铁隧道开挖对既有管线的影响分析　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着城市经济的不断发展,城市地铁日益发挥着重要作用,它给城市带来巨大的社会经济效益、社会效益和军事效益,但同时也给复杂的市政管网带来了一系列的安全问题。地铁建设在穿越地下管线时,每次隧道开挖都会不可避免地对地下管线引起扰动,从而使其受力变形,如果管线变形过大,超过其允许安全变形,管线将会出现裂缝甚至断裂,导致事故的发生。市政管网系统作为城市的生命线,它的安全与否直接危害着国民生产建设和人民的生命财产安全,因此研究管线变形规律具有重要的现实意义和深远的理论意义。本论文以典型Winkler地基梁模型计算了管线的变形和内力,并结合现场实测和数值模拟系统研究了地下管线的变形规律,论文取得主要内容和结论有:(1)系统总结了地下管线的相关知识,包括管线类别、材质、接口方式以及监测方法等。(2)基于Winkler地基梁模型建立了管线的微分控制方程,然后求解微分方程得出了管线的位移和内力表达式,最后进行了参数敏感性分析,研究出了管线埋深、管材、管隧倾角、管径和管壁厚等不同因素对管线位移和内力的影响规律。(3)以西安地铁3号线建工路-咸宁路区间工程背景为依托,分析研究了地铁隧道开挖对垂直管线和平行管线的影响规律,结论指出在浅埋暗挖法中,当管线与隧道走向垂直时,地表最终沉降曲线形式为“双峰”形式,其沉降最大值分别位于两隧道轴线正上方;当管线平行于隧道轴线时,管线的变形会因隧道施工先后顺序不同而发生差异沉降,但是最终沉降基本趋于一致。(4)采用数值模拟,分析比较了不同工法对管线的影响,结论指出在台阶法、环形开挖留核心土法、CRD法和双侧壁导坑四种工法中,其对管线影响最大的是上下台阶法,其次为预留核心土法、CRD法,影响最小的是双侧壁导坑法。(5)系统总结了地下管线的安全判别方法,并以此提出了地下管线的安全控制措施。
[Abstract]:With the development of city economy, city subway has played an increasingly important role, it brought to the city a huge social and economic benefits, social benefits and military benefits, but also to the complexity of the municipal pipe network has brought a series of security problems in the subway construction. Through underground pipelines, will inevitably cause disturbance of underground pipelines each tunnel excavation, so the deformation, if the pipeline deformation is too large, exceed the allowable deformation of pipeline safety, there will be cracks or even rupture, causing accidents. As the lifeline of the city municipal pipe network system, its security directly affects the construction of national production and people's life and property safety, practical of great significance and far-reaching theoretical significance. So the research of pipeline deformation based on a typical Winkler foundation beam model to calculate the deformation and internal force of pipeline, and combined with the Deformation field measurement and numerical simulation system of underground pipeline, the main contents and conclusions are: (1) summarizes the related knowledge of underground pipelines, including pipeline type, material, interface and monitoring methods. (2) the Winkler foundation beam model was established based on line differential equations, and then to solve the differential equation of the displacement and internal force formula of pipeline, the parameter sensitivity analysis of the buried depth of pipelines, pipe, pipe tunnel inclination, the influence of different factors of diameter and wall thickness of pipeline displacement and internal force. (3) the construction of Metro Line 3 in Xi'an road - Xianning road engineering background as the basis, analysis of the subway tunnel excavation influence on vertical pipeline and parallel pipeline, the conclusion pointed out that the underground excavation of shallow buried tunnel and pipeline, when perpendicular to the surface, the final settlement curve Type of "Shuangfeng" form, the maximum settlements are located at two above tunnel axis is parallel to the tunnel axis; when the pipeline, the pipeline deformation due to different tunnel construction sequence and differential settlement, but the final settlement is basically consistent. (4) by numerical simulation, analysis and comparison of the effects of different methods on the conclusion points out that in the pipeline, step method, ring cutting method, CRD method and meshshotcreting firstly the four methods, the impact of the pipeline is the biggest step method, followed by core indigenousreserve, CRD method, the minimum impact of meshshotcreting firstly method. (5) summarized the safety criterion the method of underground pipeline, and puts forward the safety control measures of underground pipelines.

【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U231.3;U456.3;TU990.3

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