富水区城市隧道渗流场及衬砌结构内力分析

发布时间：2018-05-26 19:18

本文选题：城市隧道 + 富水地区　；参考：《西南交通大学》2015年硕士论文

【摘要】：城市隧道修建难免会遇到地下水的问题,特别是在我国南方城市,地下水位普遍较高,而地下水作为一种宝贵资源是城市正常运转所必不可少的条件,具有不可替代的重要作用,不能随意抽排。对于城市地区的隧道修建应着力把握两点：一方面对隧址区的地下水渗流场演化规律进行研究,通过地下水的渗流场变化,判断地下水流向,对于重点区域严密监控；另一方面还应把握好富水环境中隧道衬砌结构及荷载的选取和计算,考虑到城市隧道一旦出现严重事故将可能对周边环境造成难以修复的破坏,必须保证设计断面型式应该充分满足结构安全性需求。本文依托深圳市水库下游东部过境高速公路连接线工程,主要采用数值模拟的方法开展相关研究,取得的主要研究内容及成果如下：(1)本文结合工程地质和水文地质勘察资料,建立深圳水库下游地区城市隧道大型三维地下水渗流场模型,并利用现场初始钻孔资料校核地下水位,探明了隧道开挖前后渗流场演化规律。(2)利用本工程的勘察、设计资料,建立水库下游富水地区的城市隧道三维有限差分模型,进行流固耦合分析。通过提取并分析控制点的水压变化规律,对该地区隧道衬砌的水压力折减系数进行研究,得出适用于本工程的水压力折减系数参考值。(3)分析得到了隧道开挖后的地下水位变化以及水压力折减系数参考值选取范围。根据实际工程中隧道结构断面型式和分布情况,选取典型的隧道区间,进行隧道结构内力分析研究,并判断衬砌结构安全性,对于解决此类问题,本文提出了一种综合多种软件计算手段获取更为准确的衬砌结构力学特征的方法。
[Abstract]:Urban tunnel construction will inevitably encounter the problem of groundwater, especially in southern cities of China, the groundwater level is generally high, and groundwater as a precious resource is an indispensable condition for the normal operation of the city. It has an irreplaceable important function and can not be pumped at will. Two points should be grasped for the tunnel construction in urban area: on the one hand, the evolution law of groundwater seepage field in tunnel area is studied, through the change of groundwater seepage field, the flow direction of groundwater is judged, and the key area is closely monitored; On the other hand, we should also grasp the selection and calculation of tunnel lining structure and load in water-rich environment, considering that once a serious accident occurs in a city tunnel, it may cause irreparable damage to the surrounding environment. It is necessary to ensure that the design section type should fully meet the structural safety requirements. Based on Shenzhen Reservoir East Transit Expressway connection Project, this paper mainly uses numerical simulation method to carry out related research. The main research contents and results obtained are as follows: 1) this paper combines engineering geology and hydrogeological survey data. The model of large-scale 3D groundwater seepage field of urban tunnel in downstream area of Shenzhen reservoir is established, and the groundwater table is checked by the initial drilling data in the field, and the evolution rule of seepage field before and after tunnel excavation is proved. (2) the investigation and design data of this project are used. Three-dimensional finite difference model of urban tunnel in the water-rich area downstream of reservoir is established, and the fluid-solid coupling analysis is carried out. The water pressure reduction coefficient of tunnel lining in this area is studied by extracting and analyzing the variation law of water pressure at the control point. The reference value of water pressure reduction coefficient for this project is obtained. The range of reference value of groundwater table and water pressure reduction coefficient after tunnel excavation is obtained by analyzing the reference value of water pressure reduction coefficient. According to the cross-section type and distribution of tunnel structure in actual engineering, the typical tunnel section is selected, the internal force of tunnel structure is analyzed and studied, and the safety of lining structure is judged. In this paper, a new method for obtaining more accurate mechanical characteristics of lining structure is presented.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.4

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