天津市地铁五号线盾构施工地表沉降安全性分析与对策研究

发布时间：2018-07-03 18:41

本文选题：盾构施工 + 地表沉降　；参考：《中国民航大学》2015年硕士论文

【摘要】：近年来,城市地面交通压力越来越大,全国各大城市开始大力发展地下交通。在地下交通工程施工中,盾构法具有对环境影响小、稳定性好等优点,从而得到大家的青睐。但是盾构施工也避免不了对土体的扰动,所以我们必须要面对地下工程施工中一个不可忽视的难题——地表沉降。为此,本文结合天津地铁五号线盾构施工工程,对天津地区特有的地质条件下的盾构施工引起的地表沉降做了研究,研究内容如下:1.介绍了盾构法在我国的发展现状,以及已被广泛应用的各种地表沉降的计算和预测方法,以及各方法的优缺点及适用条件。2.充分了解盾构施工的每个工序、环节,分析可能导致土体扰动每一个步骤。对五号线的工程概况充分了解,重点研究其所处地质环境情况。3.根据前人的研究,以及天津市其他已完工的盾构施工资料,从施工因素和环境因素两个方面归纳了盾构施工所致地表沉降的致因因素,认为盾构施工所致的地表沉降不仅仅是某个因素单独作用的结果,或是每个因素的作用结果的简单叠加,而是多个因素综合作用的结果,各因素之间、因素与结果之间均存在着复杂的函数关系。4.对天津地铁五号线试验段的施工资料,包括施工监测数据和地质资料进行收集整理,并利用MATLAB神经网络工具箱中的BP神经网络,在基于多因素综合作用的的基础上建立了盾构施工所致地表沉降的预测模型,通过将预测结果与实际监测数据的对比,证明了该预测模型的有效性。5.在之后的实际盾构施工中利用该模型对沉降进行了预测,找出沉降较大的点,并分析其原因,最后提出有针对性的沉降控制措施。
[Abstract]:In recent years, the pressure of urban surface traffic is increasing, the major cities in China began to vigorously develop underground traffic. In the construction of underground traffic engineering, shield method has the advantages of little environmental impact and good stability. However, shield construction can not avoid the disturbance of soil, so we must face a difficult problem in underground engineering construction-surface settlement. Therefore, combined with the shield construction project of Tianjin Metro Line 5, this paper studies the ground subsidence caused by shield construction under the special geological conditions in Tianjin area. The research contents are as follows: 1. This paper introduces the development status of shield method in China, and the calculation and prediction methods of surface subsidence which have been widely used, as well as the advantages and disadvantages of each method and the applicable conditions. Fully understand each procedure and link of shield construction, and analyze each step that may lead to soil disturbance. Fully understand the engineering situation of Route 5, and focus on its geological environment. Based on the previous studies and other completed shield construction data in Tianjin, the factors causing ground subsidence caused by shield construction are summarized from two aspects: construction factors and environmental factors. It is considered that the ground subsidence caused by shield tunneling is not only the result of single action of one factor, or the simple superposition of the result of each factor, but also the result of the combined action of many factors. There is a complex functional relationship between the factors and the results. The construction data, including construction monitoring data and geological data, of the test section of Tianjin Metro Line 5 are collected and sorted, and the BP neural network in the MATLAB neural network toolbox is used. The prediction model of surface subsidence caused by shield tunneling is established on the basis of multi-factor comprehensive action. The validity of the prediction model is proved by comparing the prediction results with the actual monitoring data. The model is used to predict the settlement, find out the large settlement, and analyze the reasons. Finally, the corresponding settlement control measures are put forward.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43;U231.3

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