發(fā)布時(shí)間：2018-03-03 13:55

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

【摘要】：隨著我國(guó)城市規(guī)模的不斷擴(kuò)大和經(jīng)濟(jì)建設(shè)的飛速發(fā)展,城市化問(wèn)題越來(lái)越嚴(yán)重,軌道交通在解決城市交通問(wèn)題中扮演重要的角色。目前國(guó)內(nèi)外城市地鐵地下隧道施工多以盾構(gòu)法施工法為主,但對(duì)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(gòu)法施工相比,淺埋暗挖隧道施工具有上覆巖土層薄,對(duì)地面環(huán)境影響大,圍巖受力復(fù)雜,安全隱患多等特點(diǎn)。因此,開(kāi)展本論文研究,對(duì)指導(dǎo)工程安全施工具有重要的理論意義和應(yīng)用價(jià)值。論文以合肥地鐵2號(hào)線的某一隧道斷面為研究背景,采用隧道理論計(jì)算、有限元數(shù)值模擬分析和監(jiān)測(cè)數(shù)據(jù)分析相結(jié)合的方法,對(duì)淺埋暗挖隧道結(jié)構(gòu)的支護(hù)受力特征和圍巖穩(wěn)定性等方面進(jìn)行了研究,研究的主要內(nèi)容和成果如下:1根據(jù)國(guó)內(nèi)外研究的現(xiàn)有資料,對(duì)隧道圍巖變形和支護(hù)結(jié)構(gòu)的公式推導(dǎo),確定地鐵淺埋暗挖隧道的圍巖壓力,以及隧道襯砌結(jié)構(gòu)受力大小及特征。2通過(guò)大量的工程實(shí)例并結(jié)合理論推導(dǎo),得出支護(hù)結(jié)構(gòu)在圍巖壓力作用下的計(jì)算公式適用于淺埋暗挖隧道。并應(yīng)用合肥地鐵工程實(shí)例進(jìn)行對(duì)理論公式進(jìn)行驗(yàn)算校核。3通過(guò)建立二維數(shù)值模型模擬CRD法和雙側(cè)壁導(dǎo)坑法施工,對(duì)比分析此兩種方法比較不同施工方法的隧道開(kāi)挖時(shí)地表沉降變化,初期支護(hù)的內(nèi)力特征和位移規(guī)律,提取隧道模型的計(jì)算結(jié)果,以及在不同工法開(kāi)挖下引起的隧道的變形隧道初期支護(hù)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(jié)論。4二維數(shù)值模型模擬CRD法和雙側(cè)壁導(dǎo)坑法施工,提取結(jié)果以圍巖位移場(chǎng)、應(yīng)力場(chǎng)和初期支護(hù)結(jié)構(gòu)內(nèi)力值。對(duì)CRD法和雙側(cè)壁導(dǎo)坑法這兩種施工方法對(duì)比分析,發(fā)現(xiàn)這兩種方式在位移場(chǎng)控制方面差別不是很大,但在圍巖應(yīng)力場(chǎng)和支護(hù)結(jié)構(gòu)內(nèi)力方面,雙側(cè)導(dǎo)坑法優(yōu)于CRD法。5通過(guò)建立淺埋暗挖隧道施工的三維數(shù)值模型,并與監(jiān)測(cè)數(shù)據(jù)進(jìn)行對(duì)比分析,得出此種結(jié)構(gòu)的地表沉降規(guī)律,初期支護(hù)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(dǎo)類似隧道工程的施工。6通過(guò)實(shí)際監(jiān)測(cè)數(shù)據(jù)和數(shù)值模擬結(jié)果的對(duì)比分析,得出三維數(shù)值模擬結(jié)果是合理的,以及在開(kāi)挖時(shí)期對(duì)開(kāi)挖尺度和開(kāi)挖進(jìn)度的控制,并做到邊開(kāi)挖邊支護(hù)的保護(hù)措施。各項(xiàng)位移的規(guī)律和最大位移值基本是吻合的,說(shuō)明了數(shù)值模擬的結(jié)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(xué)位授予單位】：安徽建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U231.3;U451

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