本文選題：淺埋 + 小凈距　； 參考：《重慶交通大學》2014年碩士論文

【摘要】：隨著城市經濟的不斷發(fā)展，中西部大開發(fā)的不斷深入，交通行業(yè)的發(fā)展已經進入一個高峰期。隨著城市路面交通的不斷飽和，城市內汽車量逐漸增多，地面交通已經不能滿足日益增長的交通需求，發(fā)展地下交通便成為解決交通壓力的一個非�？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雜，我們要在保證隧道安全的同時也要減小隧道施工對周圍環(huán)境的影響。本文以重慶軌道交通6號線中梁山1#隧道和南變電所洞室作為工程依托對象，主要研究內容和理論成果如下： ①對淺埋暗挖隧道開挖引起地表沉降的機理進行詳細分析，闡述了隧道開挖引起地表沉降的影響因素和預測地表沉降方法的國內外研究現(xiàn)狀。 ②系統(tǒng)地總結了淺埋小凈距平行隧道施工力學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力場的變化以及如何利用有限元對隧道的開挖過程進行模擬。 ③對隧道圍巖的穩(wěn)定性和其失穩(wěn)機理作了研究，同時對弱面體圍巖的弱面屈服準則和弱面最不利位置也作了一些判定。 ④對隧道深淺埋進行系統(tǒng)的劃分，，對隧道施工引起圍巖松散壓力的形成進行理論分析，對圍巖松散壓力的傳統(tǒng)計算方法和修正方法進行了比較，對隧道開挖后的圍巖的應力和變形作了彈塑性分析，并簡要描述了隧道開挖引起地表變形的損害形式。 ⑤通過設計資料了解重慶市軌道交通6號線中梁山1#隧道和南變電所洞室的施工特點，在確保隧道施工安全的前提下必須要減小對周邊環(huán)境的影響，通過控制隧道的埋深條件，運用大型有限分軟件ANSYS對隧道進行了二維有限元數(shù)值模擬分析。由數(shù)值模擬分析得出的結果對地表沉降、隧道結構應力和應變、襯砌支護的內力等方面進行綜合對比研究，對計算結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將來出現(xiàn)的相似工程提供設計和施工建議。
[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.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.4

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