本文選題：隧道　切入點：淺埋暗挖　出處：《安徽建筑大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著我國城市規(guī)模的不斷擴大和經(jīng)濟建設的飛速發(fā)展,城市化問題越來越嚴重,軌道交通在解決城市交通問題中扮演重要的角色。目前國內(nèi)外城市地鐵地下隧道施工多以盾構法施工法為主,但對特殊地段和部位因施工環(huán)境所限,采用淺埋暗挖工法施工的隧道工程也為數(shù)不少。與盾構法施工相比,淺埋暗挖隧道施工具有上覆巖土層薄,對地面環(huán)境影響大,圍巖受力復雜,安全隱患多等特點。因此,開展本論文研究,對指導工程安全施工具有重要的理論意義和應用價值。論文以合肥地鐵2號線的某一隧道斷面為研究背景,采用隧道理論計算、有限元數(shù)值模擬分析和監(jiān)測數(shù)據(jù)分析相結合的方法,對淺埋暗挖隧道結構的支護受力特征和圍巖穩(wěn)定性等方面進行了研究,研究的主要內(nèi)容和成果如下:1根據(jù)國內(nèi)外研究的現(xiàn)有資料,對隧道圍巖變形和支護結構的公式推導,確定地鐵淺埋暗挖隧道的圍巖壓力,以及隧道襯砌結構受力大小及特征。2通過大量的工程實例并結合理論推導,得出支護結構在圍巖壓力作用下的計算公式適用于淺埋暗挖隧道。并應用合肥地鐵工程實例進行對理論公式進行驗算校核。3通過建立二維數(shù)值模型模擬CRD法和雙側壁導坑法施工,對比分析此兩種方法比較不同施工方法的隧道開挖時地表沉降變化,初期支護的內(nèi)力特征和位移規(guī)律,提取隧道模型的計算結果,以及在不同工法開挖下引起的隧道的變形隧道初期支護下的軸力和彎矩、水平收斂位移、拱頂下沉位移、隧底隆起位移,分析變化規(guī)律,得出初步結論。4二維數(shù)值模型模擬CRD法和雙側壁導坑法施工,提取結果以圍巖位移場、應力場和初期支護結構內(nèi)力值。對CRD法和雙側壁導坑法這兩種施工方法對比分析,發(fā)現(xiàn)這兩種方式在位移場控制方面差別不是很大,但在圍巖應力場和支護結構內(nèi)力方面,雙側導坑法優(yōu)于CRD法。5通過建立淺埋暗挖隧道施工的三維數(shù)值模型,并與監(jiān)測數(shù)據(jù)進行對比分析,得出此種結構的地表沉降規(guī)律,初期支護的受力特征和洞內(nèi)凈空收斂、拱頂沉降和地面沉降的變化規(guī)律,可指導類似隧道工程的施工。6通過實際監(jiān)測數(shù)據(jù)和數(shù)值模擬結果的對比分析,得出三維數(shù)值模擬結果是合理的,以及在開挖時期對開挖尺度和開挖進度的控制,并做到邊開挖邊支護的保護措施。各項位移的規(guī)律和最大位移值基本是吻合的,說明了數(shù)值模擬的結果是正確合理的。
[Abstract]:With the continuous expansion of urban scale and the rapid development of economic construction in China, the problem of urbanization is becoming more and more serious. Rail transit plays an important role in solving urban traffic problems. At present, shield method is the main method in the construction of underground tunnels in cities at home and abroad, but the special areas and parts are limited by the construction environment. Compared with shield tunneling, shallow tunneling has the characteristics of thin overlying rock and soil layer, great influence on ground environment, complex stress on surrounding rock, and many hidden safety problems. The research of this paper has important theoretical significance and application value for guiding engineering safety construction. This paper takes a tunnel section of Hefei Metro Line 2 as the research background and adopts tunnel theory calculation. By combining finite element numerical simulation analysis with monitoring data analysis, the supporting force characteristics and surrounding rock stability of shallow tunneling structure are studied. The main contents and results of the study are as follows: 1 according to the existing research data at home and abroad, the deformation of tunnel surrounding rock and the formula of supporting structure are deduced, and the surrounding rock pressure of shallow buried tunnel is determined. As well as tunnel lining structure force size and characteristics .2 through a large number of engineering examples and combined with theoretical derivation, It is concluded that the formula of supporting structure under the action of surrounding rock pressure is suitable for shallow burying tunnel, and the theoretical formula is checked and checked by the example of Hefei metro project. 3. Through establishing two dimensional numerical model to simulate CRD method and double tunnel. Sidewall pit construction, Comparing these two methods with different construction methods, the surface subsidence, the internal force characteristics and the displacement law of the initial support are compared, and the calculated results of the tunnel model are extracted. The axial force and bending moment, horizontal convergent displacement, arch sinking displacement, bottom uplift displacement of the tunnel deformation caused by different excavation methods under the initial support of the tunnel are analyzed. Conclusion .4 Two-dimensional numerical model is used to simulate the construction of CRD method and double-sidewall tunnel method, and the results are obtained from the displacement field of surrounding rock, stress field and internal force of initial supporting structure. The comparison and analysis of two construction methods, CRD method and double-sidewall tunnel method, are made. It is found that the two methods are not very different in the control of displacement field, but in the stress field of surrounding rock and the internal force of the supporting structure, the double-side pit method is superior to the CRD method in establishing the three-dimensional numerical model of shallow tunneling construction. By comparing and analyzing with the monitoring data, the law of surface subsidence of this kind of structure, the stress characteristics of initial support and the convergence of clearance in the tunnel, the variation law of vault settlement and land subsidence are obtained. Through the comparison and analysis of actual monitoring data and numerical simulation results, it can be concluded that the three-dimensional numerical simulation results are reasonable, and the excavation scale and schedule are controlled during the excavation period. The law of displacement is basically consistent with the maximum displacement value, which shows that the results of numerical simulation are correct and reasonable.
【學位授予單位】：安徽建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U231.3;U451

【參考文獻】

相關期刊論文 前10條

1 顧美婷;;合肥地鐵深基坑開挖對臨近建筑物沉降的影響分析[J];安徽建筑大學學報;2016年06期

2 彭園;錢江;翟全磊;榮超;;Midas GTS三維數(shù)值分析在隧道偏壓淺埋洞口段的應用及技術實踐[J];公路;2016年06期

3 姚愛軍;盧健;邱忠旺;王文森;蔡長欣;;土巖復合地層中地鐵施工Peck沉降預測公式改進[J];鐵道建筑;2016年06期

4 鄭穎人;邱陳瑜;;普氏壓力拱理論的局限性[J];現(xiàn)代隧道技術;2016年02期

5 王春學;;淺埋暗挖隧道雙側壁導坑法施工技術[J];價值工程;2016年06期

6 張連杰;武雄;謝永;吳晨亮;;含水量及上覆壓力對重塑膨脹土抗剪強度的影響分析[J];中國地質(zhì)災害與防治學報;2015年04期

7 陳春來;趙城麗;魏綱;丁智;;基于Peck公式的雙線盾構引起的土體沉降預測[J];巖土力學;2014年08期

8 孫斐;;淺談合肥地區(qū)軌道交通工程地質(zhì)勘察監(jiān)理[J];工程與建設;2014年03期

9 王勝軍;;Midas GTS在淺埋偏壓隧道開挖分析中的應用[J];土工基礎;2013年02期

10 楊福麟;劉永林;胡斌;;武漢地鐵隧道開挖引起地表沉降的數(shù)值模擬研究[J];工程地質(zhì)學報;2013年01期

相關博士學位論文 前1條

1 房倩;高速鐵路隧道支護與圍巖作用關系研究[D];北京交通大學;2010年

相關碩士學位論文 前4條

1 婁海成;淺埋偏壓大斷面隧道圍巖變形與支護受力研究[D];北京交通大學;2015年

2 周鋒;大斷面淺埋暗挖隧道施工方法及其穩(wěn)定性研究[D];西安建筑科技大學;2013年

3 夏恩明;城市地鐵隧道圍巖穩(wěn)定性研究[D];重慶大學;2012年

4 喻偉;淺埋偏壓隧道施工圍巖變形與支護結構受力分析[D];重慶交通大學;2012年

，

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