排水管道上跨地铁车站防渗分析与处理

发布时间：2018-03-23 19:28

本文选题：地铁防水　切入点：管道泄漏　出处：《北京交通大学》2015年硕士论文

【摘要】：目前,随着中国经济实力的大幅增强和城镇化程度的不断加深,越来越多的人涌进大城市中,使得本就不甚通畅的城市交通变得更加拥堵。为了解决交通拥堵问题,为市民创造更加便利的出行条件,很多城市加入到如火如荼的地铁建设热潮中来。由于地铁车站结构多数埋设在地面以下甚至地下水位以下,使得其长期承受周围岩土体中渗流场的影响和侵蚀,影响结构安全与耐久性。地铁车站结构的防水防渗问题一直是工程界的一大难题。随着地铁车站数量的增加,不可避免地与市政地下管线产生交叉影响问题,如果地铁车站结构位于市政排水管道下方,一旦管道发生漏水,势必会对地铁结构防水防渗造成不良影响。如何降低和杜绝这种影响,是本文研究的内容。本文以昌平区市政排水管道上跨地铁昌平线南邵车站为工程背景,采用理论分析与数值模拟相结合的方法,研究地基不均匀沉降下地下排水管道泄漏所引起的渗流场的扩散规律及其对周围土体和地铁车站造成的影响,提出解决措施,并对两种治理方法分别进行了数值模拟分析与研究。主要工作如下：(1)结合昌平区地下排水管道上跨地铁车站工程,对地基不均匀沉降情况进行了分析,研究和分析了土体和管道的受力变形情况。(2)采用“渗流理论”,对管道渗漏引起的渗流场扩散情况进行分析与研究。(3)建立渗流分析模型,对土工膜防渗法的防渗效果进行了模拟与研究。(4)利用PFC2D程序,建立粘土中劈裂注浆颗粒流数值模型。研究了在围压恒定,注浆压力不同条件下,土体内的压力变化规律以及浆液扩散规律,通过分析,得到最佳注浆压力。(5)对两种防渗处理方法进行了对比分析。
[Abstract]:At present, with the substantial increase in China's economic strength and the deepening level of urbanization, more and more people are flocking into large cities, making the already unsmooth urban traffic more congested. In order to solve the traffic congestion problem, To create more convenient conditions for citizens to travel, many cities have joined the boom in subway construction. As most subway station structures are buried below the ground and even below the groundwater level, This makes it endure the influence and erosion of seepage field in surrounding rock and soil for a long time, and affects the safety and durability of structure. The waterproof and seepage prevention problem of subway station structure is always a big problem in the engineering field. With the increase of the number of subway stations, Inevitably there is a cross impact problem with the municipal underground pipeline. If the subway station structure is located below the municipal drainage pipe, once the pipe leaks, It will inevitably have a bad effect on the waterproofing and impermeability of subway structure. How to reduce and put an end to this influence is the content of this paper. This paper takes the Nanshao Station on Changping District Municipal drainage Pipeline as the engineering background. By combining theoretical analysis with numerical simulation, the diffusion law of seepage field caused by leakage of underground drainage pipeline under uneven settlement of foundation and its influence on surrounding soil and subway station are studied, and the solutions are put forward. The main work is as follows: (1) combined with the underground drainage pipeline crossing subway station project in Changping District, the uneven settlement of the foundation is analyzed. The seepage analysis model is established by using "seepage theory" to analyze and study the seepage field diffusion caused by pipeline leakage. The anti-seepage effect of geomembrane anti-seepage method is simulated and studied. (4) using PFC2D program, a numerical model of split grouting particle flow in clay is established. Under the condition of constant confining pressure and different grouting pressure, a numerical model of split grouting particle flow in clay is established. Based on the analysis of the law of pressure variation and slurry diffusion in soil, the optimum grouting pressure is obtained. (5) the two anti-seepage treatment methods are compared and analyzed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU992.23

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