本文選題：淺埋暗挖法隧道施工 + 地表沉降�。� 參考：《中國地質(zhì)大學(北京)》2017年碩士論文

【摘要】：我國近幾年的城市化發(fā)展迅速,城市規(guī)模不斷擴大,地上交通壓力隨之越來越大,地下交通模式被更多的運用到城市建設當中。地鐵一般建設在人口密集、地上建筑較多或者有城市主干道的地段。為了不影響地上交通與建筑,在一些隧道開挖過程中只能采用暗挖法。淺埋暗挖工程中,地表沉降是一項十分重要的安全參考因素,通過地表沉降的累積量與速率可以大致了解工程現(xiàn)階段的狀況。在本文中,首先介紹了淺埋暗挖法施工的原理與常見施工方法,之后介紹了對地表沉降影響的研究的發(fā)展狀況,還介紹了實際工程中監(jiān)控測量的實施。文章主體部分是對實際監(jiān)測數(shù)據(jù)的分析與相關的數(shù)值模擬,依據(jù)溫陽路站的實際工程資料與監(jiān)測數(shù)據(jù),結(jié)合理論分析與數(shù)值模擬結(jié)合方法,運用MIDAS/GTS進行施工過程模擬,分析不同開挖支護方式對地表沉降的影響,得出以下幾點結(jié)論:1、實際工程中對管線變形限制嚴格的區(qū)域需要布置標準管線沉降監(jiān)測點,不能用簡易監(jiān)測點代替;2、隧道縱向上,開挖段面的影響區(qū)域在3倍洞徑范圍,超過3倍洞徑后影響減小,在1到1.5倍洞徑區(qū)域內(nèi)影響最大,此時地表沉降速率最大。橫向上沉降規(guī)律基本符合Peck公式所描素,沉降槽呈正態(tài)分布趨勢。3、在本文類似工程條件下,采用不同開挖支護方案對地表沉降的影響按從小到大排序為:雙側(cè)壁導洞法、CD法、單側(cè)壁導洞法、臺階法、全斷面開挖法。臺階法開挖產(chǎn)生的沉降值比CD法與單側(cè)壁導洞法多出50%左右。在隧道截面與本工程類似的情況下不適宜采用全斷面開挖方式;4、隧道開挖過程中支護體系受力主要位于隧道截面的肩部與仰拱兩側(cè),在進行支護結(jié)構(gòu)設計時應當增加這些部位支護結(jié)構(gòu)的強度。
[Abstract]:In recent years, the urbanization in China has developed rapidly, the scale of the city is expanding, and the pressure on the ground is becoming more and more heavy. The underground transportation mode is more used in the urban construction. The subway is generally built in a densely populated, ground building or the main road of the city. In order to not affect the ground traffic and construction, some tunnels are in the tunnel. In the process of excavation, the method of excavation can only be used. In shallow excavation, ground subsidence is a very important safety reference factor. Through the accumulation and rate of surface subsidence, the current state of the project can be roughly understood. In this paper, the principle and common construction methods of shallow buried excavation method are introduced first, and then the ground is introduced. The development of the research on the influence of the surface subsidence and the implementation of the monitoring and measuring in the actual project. The main part of the article is the analysis of the actual monitoring data and the related numerical simulation. According to the actual engineering data and the monitoring data of the Wen Yang Road station, combining the theoretical analysis with the numerical simulation method, the construction process is carried out by MIDAS/GTS. Simulation and analysis of the influence of different excavation and support methods on the surface subsidence, draw the following conclusions: 1, in the actual project, the area where the pipeline deformation is restricted strictly requires the arrangement of standard pipeline settlement monitoring points, and can not be replaced with simple monitoring points; 2, the tunnel vertical, the area of the excavation section is over 3 times the diameter of the hole, over 3 times the hole diameter. The effect is greatest in the area of 1 to 1.5 times the diameter of the hole, and the surface subsidence rate is the largest. The law of lateral subsidence is basically in line with the Peck formula, and the settlement trough is.3. Under the similar engineering conditions, the effect of different excavation support schemes on the surface subsidence is: the double wall guide method, CD Method, single side wall guide, step method, full section excavation method, the settlement value produced by step method is more than 50% more than that of CD method and single side wall guide hole method. Under the similar situation of tunnel section with this project, the full section excavation method is not suitable. 4, the force of the support system is mainly located in the shoulder and the inverted arch of the tunnel section during the tunnel excavation. On the side, the strength of supporting structures should be increased when supporting structure design is carried out.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.4;TU433
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本文編號：1907176