本文選題：淺埋 + 小凈距�。� 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：隨著城市經(jīng)濟(jì)的不斷發(fā)展，中西部大開發(fā)的不斷深入，交通行業(yè)的發(fā)展已經(jīng)進(jìn)入一個(gè)高峰期。隨著城市路面交通的不斷飽和，城市內(nèi)汽車量逐漸增多，地面交通已經(jīng)不能滿足日益增長(zhǎng)的交通需求，發(fā)展地下交通便成為解決交通壓力的一個(gè)非�？尚械拇胧�。在地下交通工程中淺埋小凈距平行隧道是交通建設(shè)中常常遇到的一種隧道類型，然而，淺埋小凈距平行隧道較一般的隧道更為復(fù)雜，我們要在保證隧道安全的同時(shí)也要減小隧道施工對(duì)周圍環(huán)境的影響。本文以重慶軌道交通6號(hào)線中梁山1#隧道和南變電所洞室作為工程依托對(duì)象，主要研究?jī)?nèi)容和理論成果如下： ①對(duì)淺埋暗挖隧道開挖引起地表沉降的機(jī)理進(jìn)行詳細(xì)分析，闡述了隧道開挖引起地表沉降的影響因素和預(yù)測(cè)地表沉降方法的國(guó)內(nèi)外研究現(xiàn)狀。 ②系統(tǒng)地總結(jié)了淺埋小凈距平行隧道施工力學(xué)基本原理及其施工方法，介紹了有限元基本原理、有限元離散化的涵義、隧道開挖過程圍巖應(yīng)力場(chǎng)的變化以及如何利用有限元對(duì)隧道的開挖過程進(jìn)行模擬。 ③對(duì)隧道圍巖的穩(wěn)定性和其失穩(wěn)機(jī)理作了研究，同時(shí)對(duì)弱面體圍巖的弱面屈服準(zhǔn)則和弱面最不利位置也作了一些判定。 ④對(duì)隧道深淺埋進(jìn)行系統(tǒng)的劃分，，對(duì)隧道施工引起圍巖松散壓力的形成進(jìn)行理論分析，對(duì)圍巖松散壓力的傳統(tǒng)計(jì)算方法和修正方法進(jìn)行了比較，對(duì)隧道開挖后的圍巖的應(yīng)力和變形作了彈塑性分析，并簡(jiǎn)要描述了隧道開挖引起地表變形的損害形式。 ⑤通過設(shè)計(jì)資料了解重慶市軌道交通6號(hào)線中梁山1#隧道和南變電所洞室的施工特點(diǎn)，在確保隧道施工安全的前提下必須要減小對(duì)周邊環(huán)境的影響，通過控制隧道的埋深條件，運(yùn)用大型有限分軟件ANSYS對(duì)隧道進(jìn)行了二維有限元數(shù)值模擬分析。由數(shù)值模擬分析得出的結(jié)果對(duì)地表沉降、隧道結(jié)構(gòu)應(yīng)力和應(yīng)變、襯砌支護(hù)的內(nèi)力等方面進(jìn)行綜合對(duì)比研究，對(duì)計(jì)算結(jié)果分析得出了一些基本規(guī)律，并由此確定最優(yōu)的隧道埋置深度，本文的研究成果可對(duì)將來出現(xiàn)的相似工程提供設(shè)計(jì)和施工建議。
[Abstract]:With the development of the urban economy and the development of the central and western regions, the development of the transportation industry has entered a peak period. With the continuous saturation of urban road traffic and the increasing number of vehicles in the city, the ground transportation can no longer meet the increasing traffic demand. Therefore, the development of underground traffic becomes a very feasible measure to solve the traffic pressure. In underground traffic engineering, shallow tunnel with small clear distance is a kind of tunnel type that is often encountered in traffic construction. However, shallow tunnel with small net distance is more complicated than ordinary tunnel. We should not only ensure tunnel safety, but also reduce the impact of tunnel construction on the surrounding environment. This paper takes the tunnel of Zhongliangshan 1# tunnel and south substation of Chongqing rail transit line 6 as the object of engineering support. The main research contents and theoretical results are as follows The main contents are as follows: 1. The mechanism of surface settlement caused by shallow excavation tunnel excavation is analyzed in detail. The influencing factors of surface settlement caused by tunnel excavation and the research status of forecasting surface settlement methods at home and abroad are expounded. 2. The basic construction mechanics principle and construction method of shallow buried parallel tunnel with small net distance are summarized systematically. The basic principle of finite element method and the meaning of discretization of finite element are introduced. The variation of surrounding rock stress field during tunnel excavation and how to simulate the excavation process by finite element method. 3. The stability and instability mechanism of tunnel surrounding rock are studied, and the yield criterion of weak face and the most unfavorable position of weak surface are also determined. (4) systematic division of tunnel depth and shallow burying, theoretical analysis of formation of surrounding rock loose pressure caused by tunnel construction, comparison of traditional calculation method and correction method of surrounding rock loose pressure. The stress and deformation of surrounding rock after tunnel excavation are analyzed and the damage forms of surface deformation caused by tunnel excavation are described briefly. 5. Through the design data to understand the construction characteristics of the tunnel of Zhongliangshan 1# Tunnel and the South Substation of Chongqing Rail Transit Line 6, under the premise of ensuring the safety of the tunnel construction, we must reduce the influence on the surrounding environment and control the condition of the buried depth of the tunnel. The two-dimensional finite element numerical simulation of the tunnel is carried out by using the large-scale finite-component software ANSYS. The results obtained from numerical simulation analysis are compared with each other in the aspects of surface settlement, stress and strain of tunnel structure, and internal force of lining support, and some basic laws are obtained from the analysis of calculation results. The results of this paper can provide design and construction suggestions for similar projects in the future.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.4

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