本文選題：隧道 + CD法��； 參考：《重慶交通大學》2015年碩士論文

【摘要】：本論文的研究以博羅石鼓隧道為依托,該隧道主體位于軟弱圍巖中,結合實際工程研究軟弱圍巖下隧道施工的方法,對今后類似的軟巖隧道施工方法提供參考。論文主要根據(jù)隧道地質(zhì)條件、水文地質(zhì)條件以及各種地質(zhì)資料,以數(shù)值模擬分析和現(xiàn)場監(jiān)控量測相結合的手段,展開對隧道在施工過程中力學行為研究,通過有限元軟件ANSYS模擬中隔壁法(以下簡稱CD法)和雙側壁導坑法開挖淺埋暗挖隧道,計算分析了圍巖、初支應力及位移的力學性現(xiàn)象。具體成果如下:(1)巖性、巖體結構和裂隙、地應力、工程因素等都是影響軟弱圍巖下隧道結構穩(wěn)定性的因素,而軟弱圍巖下隧道結構的破壞特征包括破壞方式多、變形量大、變形速度高、持續(xù)時間長、破壞范圍大和位置不一等。破壞的模式包括掉塊、膨脹破壞、擠壓破壞、滑動破壞等。(2)根據(jù)依托工程實際地質(zhì)情況,文中利用有限元軟件ANSYS進行CD法和雙側壁導坑法的三維建模數(shù)值分析,通過計算數(shù)據(jù)分析可以得出圍巖、初期支護的應力和位移值,對比規(guī)范并結合工程經(jīng)驗圍巖、初期支護受力均低于強度規(guī)范值,都滿足設計規(guī)范的強度要求;圍巖、初期支護的位移變化均符合規(guī)范要求。根據(jù)計算結果,雙側壁導坑法對沉降的控制更為有效,其最終沉降值約為CD法的一半。初支的應力也較CD法小,偏向于安全。但兩種方法的計算結果均符合《公路隧道設計規(guī)范》(JTG D70-2004)極限位移判斷公路隧道拱頂沉降變形控制值要求。因此,本工程CD法和雙側壁導坑法均可以采用,但從工藝、成本、工期、經(jīng)濟學方面考慮,CD法優(yōu)于雙側壁導坑法。(3)綜合了各項因素考慮,CD法較雙側壁導坑法優(yōu)勢明顯,是本工程中所選用的方法,其有利于大型機械施工,工序間相互影響較小,安全和經(jīng)濟性較為明顯,對于快速施工意義重大。
[Abstract]:The research of this paper is based on the Bolo Shigu tunnel, which is located in the weak surrounding rock. Combining with the actual engineering, the paper studies the construction method of the tunnel under the soft rock, and provides a reference for the similar soft rock tunnel construction method in the future. According to the tunnel geological conditions, hydrogeological conditions and various geological data, the paper studies the mechanical behavior of the tunnel in the construction process by means of numerical simulation analysis and field monitoring and measurement. By using the finite element software ANSYS to simulate the shallow excavation tunnel by the adjoining wall method (CD method) and the double-side wall guide pit method, the mechanical phenomena of surrounding rock, initial support stress and displacement are calculated and analyzed. The concrete results are as follows: lithology, rock mass structure and fissure, in-situ stress, engineering factors and so on are all factors that affect the stability of tunnel structure under weak surrounding rock. The failure characteristics of tunnel structure under weak surrounding rock include many failure modes and large deformation. The deformation speed is high, the duration is long, the damage range is large and the position is different. The failure modes include mass drop, expansion failure, extrusion failure, sliding failure and so on. According to the actual geological conditions of the engineering, the 3D modeling numerical analysis of CD method and double-side wall guide pit method is carried out by using the finite element software ANSYS in this paper. Through the analysis of calculation data, the stress and displacement values of surrounding rock and initial support can be obtained. Compared with the code and combined with engineering experience surrounding rock, the initial support force is lower than the strength standard value, which all meet the strength requirements of the design code. The displacement changes of the initial support are in accordance with the requirements of the code. According to the calculation results, the method of double-side wall guide pit is more effective in controlling the settlement, and its final settlement value is about half of that of CD method. The stress of the initial branch is smaller than that of the CD method, and the stress is more safe than that of the CD method. However, the calculation results of the two methods are in line with the limit displacement of JTG D70-2004) for judging the control value of the settlement and deformation of the arch roof of the highway tunnel. Therefore, both the CD method and the double-side wall method can be used in this project, but in terms of technology, cost, time limit and economics, the CD method is superior to the double-side wall method in considering all factors, and the advantages of CD method are obvious than that of the double-side wall method. It is the method chosen in this project, which is beneficial to large-scale mechanical construction, with little interaction between working procedures, obvious safety and economy, and is of great significance for rapid construction.
【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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