本文選題：地裂縫 + 地表沉降�。� 參考：《西安科技大學》2017年碩士論文

【摘要】：地裂縫是西安地鐵隧道建設(shè)過程所必須面臨的關(guān)鍵難題,如何正確處理地裂縫問題對地鐵隧道安全穩(wěn)定的影響將是地鐵建設(shè)過程中的關(guān)鍵所在,因此,進行地鐵隧道穿越地裂縫誘發(fā)的地表沉降規(guī)律及控制技術(shù)研究意義重大。論文依托西安地鐵1號線半坡～紡織城區(qū)間工程,采用理論分析、數(shù)值模擬和現(xiàn)場監(jiān)測相結(jié)合的方法對隧道穿越地裂縫引起的地表沉降規(guī)律進行研究,提出了地表沉降控制措施,指導(dǎo)了工程實踐。論文主要工作如下:(1)地裂縫災(zāi)害表現(xiàn)形式主要表現(xiàn)為周期性、有限性、方向性、緩變性和累進性、非均衡性和非對稱性以及地裂縫災(zāi)害的不可抗拒性。地鐵隧道無論從荷載還是變形方面都與無地裂縫時表現(xiàn)出較大差異,主要表現(xiàn)在兩個方面:①作用于隧道的荷載發(fā)生改變;②隧道底面出現(xiàn)了脫空現(xiàn)象。(2)通過對作用于隧道荷載的理論研究,建立了隧道穿越地裂縫的計算模型,并將地裂縫作用下隧道的受力過程分為沉降初期、脫空發(fā)展階段和完全脫空階段三個階段。(3)運用FLAC3D軟件對隧道穿越地裂縫引起的地表沉降規(guī)律進行研究,計算結(jié)果表明:隧道拱頂豎向和地表沉降值遠遠超過規(guī)范允許值,隧道上方的電建小區(qū)樓房基礎(chǔ)變形很大,易造成墻體傾斜甚至傾覆,必須采取合理有效的控制措施。(4)結(jié)合西安地鐵1號線半坡～紡織城區(qū)間暗挖段工程特點,從隧道結(jié)構(gòu)設(shè)計、地層加固設(shè)計和開挖步驟三方面提出了穿越地裂縫隧道引起的地表沉降控制技術(shù)措施。(5)給出了現(xiàn)場監(jiān)測方案設(shè)計,并完成了現(xiàn)場實測。通過分析實測監(jiān)測數(shù)據(jù),結(jié)果表明,采取文中提出的控制措施后,整個隧道穿越地裂縫的施工過程能夠確保隧道上方道路變形在允許范圍之內(nèi)和電建小區(qū)大樓變形得到有效控制,從而保證了隧道上方道路的正常使用和臨近樓房的安全穩(wěn)定;表明提出的控制措施合理且有效。
[Abstract]:Ground fissures are the key problems that must be faced in the process of subway tunnel construction in Xi'an. How to correctly deal with the influence of ground cracks on the safety and stability of subway tunnel will be the key point in the process of subway construction. It is of great significance to study the law and control technology of ground subsidence induced by ground fissures in subway tunnel. In this paper, based on the project between the slope of Xi'an Metro Line 1 and the textile city, the ground subsidence law caused by the tunnel passing through the ground fissure is studied by the methods of theoretical analysis, numerical simulation and field monitoring. The control measures of surface subsidence are put forward and the engineering practice is guided. The main work of this paper is as follows: (1) the main forms of ground fissure disasters are periodicity, finiteness, directionality, slow variation and progression, disequilibrium and asymmetry, and irresistibility of ground fissures. The subway tunnel is different from the ground crack in terms of load and deformation, mainly in two aspects: the change of the load acting on the tunnel by 1: 1; (2) through the theoretical research on the load acting on the tunnel, the calculation model of tunnel crossing ground fissure is established, and the stress process of the tunnel under the action of ground crack is divided into the initial stage of settlement. The ground subsidence law caused by tunnel crossing ground fissure is studied by using FLAC3D software. The calculation results show that the vertical and surface settlement values of tunnel vault are far more than the allowable value of the code. The building foundation of electric construction district above the tunnel is very large deformation, easy to cause wall incline or even overturn, must take reasonable and effective control measures. 4) combined with Xi'an Metro Line 1 semi-slope ~ textile urban area between the subsurface excavation engineering characteristics, from the tunnel structure design, it is necessary to take reasonable and effective control measures. The ground subsidence control measures caused by ground fissure tunnel are put forward from three aspects of ground reinforcement design and excavation steps. The design of site monitoring scheme is given and the field measurement is completed. Through the analysis of the measured monitoring data, the results show that, after taking the control measures proposed in this paper, The whole construction process of the tunnel through the ground crack can ensure that the deformation of the road above the tunnel is within the allowable range and the deformation of the building in the electric building can be effectively controlled, thus ensuring the normal use of the road above the tunnel and the safety and stability of the adjacent building; The results show that the proposed control measures are reasonable and effective.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U231.3;U456.3;P642.26

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