本文選題：偏壓　切入點：雙連拱隧道　出處：《重慶交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：公路連拱隧道作為一種特殊的結構形式,具有受地形條件限制小,線形順暢,引線占地少,跨度大,空間利用率高,結構整體性好以及綜合造價低等特點。但由于連拱隧道自身結構的特點,施工期間圍巖、隧道結構的受力狀況都十分復雜,影響連拱隧道在施工期間和運行穩(wěn)定性。因此,有必要對連拱隧道的施工過程進行研究。本文依托四川省閬中市嘉陵江四橋連接線東山連拱隧道工程,應用有限元軟件ABAQUS對隧道施工分步開挖過程進行了有限元數(shù)值分析,對偏壓作用下雙連拱隧道在整個施工過程的力學行為進行了分析研究,具體工作如下:①針對隧道不同的開挖順序,進行了六種方案的動態(tài)數(shù)值模擬,詳細分析了圍巖應力的變化情況、中隔墻和襯砌的應力狀態(tài)以及錨桿的受力特點。②將六種模擬方案分組,對比分析不同施工方案各關鍵工序的模擬結果,得到偏壓作用下連拱隧道施工的優(yōu)選方案為(方案一)先右后左的上臺階中隔壁法。③綜合分析各模擬方案,得到雙連拱隧道施工過程中,圍巖應力分布、中隔墻和支護結構受力變化的規(guī)律,指出施工期間圍巖在隧道拱頂及底部受力較大,中隔墻在隧道先開挖一側的壓應力大于后開挖一側的應力,與中隔墻交接處的襯砌受力復雜,易發(fā)生破壞。④從改變錨桿數(shù)量和長短的角度,計算分析圍巖應力分布、中隔墻的受力情況,對連拱隧道支護參數(shù)進行優(yōu)化,得出錨桿數(shù)量減少及長度減少一米后,隧道圍巖及支護受力均滿足設計及安全要求。
[Abstract]:As a special structural form, highway multi-arch tunnel has the advantages of small limitation of terrain, smooth alignment, small lead occupation, large span and high space utilization ratio. The structural integrity is good and the comprehensive cost is low. However, due to the structural characteristics of the multi-arch tunnel itself, the stress state of the surrounding rock and the tunnel structure during construction is very complicated, which affects the stability of the multi-arch tunnel during construction and operation. It is necessary to study the construction process of the multi-arch tunnel. Based on the Dongshan double-arch tunnel project of Jialing River 4th Bridge connecting line in Langzhong City, Sichuan Province, the finite element software ABAQUS is used to carry out the finite element numerical analysis on the excavation process of the tunnel construction step by step. The mechanical behavior of double-arch tunnel under biasing pressure is analyzed and studied in the whole construction process. The concrete work is as follows: 1. According to the different excavation sequence of the tunnel, the dynamic numerical simulation of six schemes is carried out. The variation of surrounding rock stress, the stress state of middle partition wall and lining and the stress characteristics of anchor rod are analyzed in detail. 2. The six simulation schemes are grouped, and the simulation results of each key process of different construction schemes are compared and analyzed. It is obtained that the optimal construction scheme of multi-arch tunnel under biasing pressure is as follows: (scheme one) the next door method in the upper steps, which is first right and left, synthetically analyzes the simulation schemes, and obtains the stress distribution of surrounding rock in the construction process of double-arch tunnel. The law of stress variation of middle partition wall and supporting structure is pointed out. It is pointed out that the stress of surrounding rock on the top and bottom of tunnel arch during construction is great, and the compressive stress of middle partition wall on the side of tunnel excavation is greater than that on the side of tunnel excavation later. The lining at the junction with the middle partition wall is complicated in force, and it is easy to break .4 from the angle of changing the number and length of the anchor rod, the stress distribution of surrounding rock and the stress situation of the middle partition wall are calculated and analyzed, and the supporting parameters of the multi-arch tunnel are optimized. It is concluded that after the reduction of bolt number and length by one meter, the surrounding rock and supporting forces of the tunnel can meet the design and safety requirements.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U455.4

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