本文選題：城市隧道 + 地表沉陷��； 參考：《中國(guó)礦業(yè)大學(xué)》2014年碩士論文

【摘要】：城市隧道施工會(huì)不可避免地引發(fā)一定程度的地表沉陷，，嚴(yán)重的地表沉陷事故會(huì)對(duì)人們的生命和財(cái)產(chǎn)安全造成嚴(yán)重威脅，于是隧道施工引發(fā)的地表沉陷機(jī)理問(wèn)題越來(lái)越受到人們的關(guān)注。同時(shí)，隨著地鐵建設(shè)的快速發(fā)展，城市隧道施工引發(fā)的地表沉陷事故越來(lái)越頻繁，故對(duì)城市隧道施工引發(fā)的地表沉陷機(jī)理進(jìn)行研究具有重要的學(xué)術(shù)價(jià)值和現(xiàn)實(shí)意義。 本文采用理論分析、數(shù)值模擬、工程實(shí)例相結(jié)合的手段，從壓力拱角度研究了城市隧道施工引發(fā)的地表沉陷機(jī)理，主要進(jìn)行了以下研究工作： （1）對(duì)隧道施工引發(fā)的地表沉陷全過(guò)程進(jìn)行了UDEC離散元數(shù)值模擬，得到地表沉陷全過(guò)程中壓力拱內(nèi)邊界外移的規(guī)律：若壓力拱內(nèi)邊界不斷外移至地表附近，則引起地表整體塌陷；若壓力拱內(nèi)邊界外移一定程度后停止外移，則地表僅出現(xiàn)一定程度的沉陷。 （2）對(duì)隧道施工引發(fā)地表沉陷的相關(guān)因素進(jìn)行正交試驗(yàn)分析，結(jié)果顯示圍巖條件對(duì)地表沉陷值及地表沉陷區(qū)寬度的影響最大，節(jié)理間距對(duì)隧道塌方面積的影響最為顯著。 （3）研究了錨桿支護(hù)、錨噴支護(hù)以及復(fù)合式襯砌支護(hù)對(duì)地表沉陷的影響，得到各種支護(hù)能不同程度限制巖土體中壓力拱內(nèi)邊界的外移，從而減小地表沉陷的結(jié)論。 （4）研究了全斷面法和臺(tái)階法施工對(duì)地表沉陷的影響，得到臺(tái)階法施工能有效限制巖土體中壓力拱內(nèi)邊界的外移，從而減小地表沉陷的結(jié)論。 （5）結(jié)合某工程實(shí)例進(jìn)行對(duì)比驗(yàn)證。結(jié)果表明：數(shù)值模擬得到的規(guī)律和結(jié)果與現(xiàn)場(chǎng)實(shí)測(cè)基本一致。
[Abstract]:Urban tunnel construction will inevitably lead to a certain degree of surface subsidence, serious surface subsidence accidents will pose a serious threat to people's lives and property safety. Therefore, people pay more and more attention to the surface subsidence mechanism caused by tunnel construction. At the same time, with the rapid development of subway construction, ground subsidence accidents caused by urban tunnel construction are more and more frequent. Therefore, it is of great academic value and practical significance to study the mechanism of surface subsidence caused by urban tunnel construction. The mechanism of surface subsidence induced by urban tunnel construction is studied from the angle of pressure arch. The main research work is as follows: 1) the UDEC discrete element numerical simulation of the whole process of surface subsidence caused by tunnel construction is carried out. The law of the internal boundary migration of the pressure arch during the whole process of surface subsidence is obtained: if the inner boundary of the pressure arch moves continuously to the vicinity of the surface, the whole surface collapses will be caused, and if the internal boundary of the pressure arch moves out to a certain extent, the external movement will be stopped. The results show that the surrounding rock condition has the greatest influence on the surface subsidence value and the width of the surface subsidence area, and the results show that the surrounding rock condition has the greatest influence on the surface subsidence value and the width of the surface subsidence zone, and the results show that the surrounding rock condition has the greatest influence on the surface subsidence value and the width of the surface subsidence zone. The influence of joint spacing on the area of tunnel collapse is most significant. (3) the influence of bolt support, bolt shotcrete support and composite lining support on surface subsidence is studied. It is concluded that various types of support can limit the internal boundary of pressure arch in rock and soil to some extent. In order to reduce the surface subsidence, the paper studies the influence of the full-section method and the step method construction on the surface subsidence, and concludes that the step method construction can effectively limit the external movement of the inner boundary of the pressure arch in the rock and soil. Therefore, the conclusion of reducing the surface subsidence is concluded. The results show that the laws and results obtained by numerical simulation are in good agreement with the field measurements.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU433;U455

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本文編號(hào)：1987507