本文選題：城市隧道 + 富水地區(qū)　； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：城市隧道修建難免會(huì)遇到地下水的問(wèn)題,特別是在我國(guó)南方城市,地下水位普遍較高,而地下水作為一種寶貴資源是城市正常運(yùn)轉(zhuǎn)所必不可少的條件,具有不可替代的重要作用,不能隨意抽排。對(duì)于城市地區(qū)的隧道修建應(yīng)著力把握兩點(diǎn)：一方面對(duì)隧址區(qū)的地下水滲流場(chǎng)演化規(guī)律進(jìn)行研究,通過(guò)地下水的滲流場(chǎng)變化,判斷地下水流向,對(duì)于重點(diǎn)區(qū)域嚴(yán)密監(jiān)控；另一方面還應(yīng)把握好富水環(huán)境中隧道襯砌結(jié)構(gòu)及荷載的選取和計(jì)算,考慮到城市隧道一旦出現(xiàn)嚴(yán)重事故將可能對(duì)周邊環(huán)境造成難以修復(fù)的破壞,必須保證設(shè)計(jì)斷面型式應(yīng)該充分滿足結(jié)構(gòu)安全性需求。本文依托深圳市水庫(kù)下游東部過(guò)境高速公路連接線工程,主要采用數(shù)值模擬的方法開(kāi)展相關(guān)研究,取得的主要研究?jī)?nèi)容及成果如下：(1)本文結(jié)合工程地質(zhì)和水文地質(zhì)勘察資料,建立深圳水庫(kù)下游地區(qū)城市隧道大型三維地下水滲流場(chǎng)模型,并利用現(xiàn)場(chǎng)初始鉆孔資料校核地下水位,探明了隧道開(kāi)挖前后滲流場(chǎng)演化規(guī)律。(2)利用本工程的勘察、設(shè)計(jì)資料,建立水庫(kù)下游富水地區(qū)的城市隧道三維有限差分模型,進(jìn)行流固耦合分析。通過(guò)提取并分析控制點(diǎn)的水壓變化規(guī)律,對(duì)該地區(qū)隧道襯砌的水壓力折減系數(shù)進(jìn)行研究,得出適用于本工程的水壓力折減系數(shù)參考值。(3)分析得到了隧道開(kāi)挖后的地下水位變化以及水壓力折減系數(shù)參考值選取范圍。根據(jù)實(shí)際工程中隧道結(jié)構(gòu)斷面型式和分布情況,選取典型的隧道區(qū)間,進(jìn)行隧道結(jié)構(gòu)內(nèi)力分析研究,并判斷襯砌結(jié)構(gòu)安全性,對(duì)于解決此類問(wèn)題,本文提出了一種綜合多種軟件計(jì)算手段獲取更為準(zhǔn)確的襯砌結(jié)構(gòu)力學(xué)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.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U451.4

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本文編號(hào)：1938585