本文選題：淺埋暗挖隧道 + 現(xiàn)場(chǎng)監(jiān)測(cè)　； 參考：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：隨著城市軌道交通的飛速發(fā)展,城市地鐵正在加速建設(shè)當(dāng)中。目前,淺埋暗挖法是城市地鐵施工常用的一種方法,地鐵開挖會(huì)引起地層移動(dòng)而導(dǎo)致不同程度的位移和沉降,車輛在行駛過程中也會(huì)對(duì)隧道結(jié)構(gòu)的變形造成影響,而對(duì)黃土地區(qū)地鐵施工受地表車輛荷載的影響研究較為少見。針對(duì)上述問題,本文以西安市地鐵四號(hào)線飛天路~航天大道站區(qū)間工程實(shí)例為依托,采用現(xiàn)場(chǎng)監(jiān)測(cè)和數(shù)值模擬相結(jié)合的研究方法,對(duì)黃土地區(qū)淺埋暗挖地鐵隧道的沉降與變形進(jìn)行了研究。主要工作如下:結(jié)合隧道現(xiàn)場(chǎng)施工對(duì)地表下沉、拱頂沉降、水平收斂和圍巖壓力進(jìn)行監(jiān)測(cè),通過對(duì)監(jiān)測(cè)結(jié)果分析,得到了地鐵開挖對(duì)隧道及周邊環(huán)境的影響規(guī)律。運(yùn)用ANSYS有限元軟件建立了雙線平行地鐵隧道開挖的數(shù)值模型,分析了隧道開挖對(duì)地表沉降、初期支護(hù)、地下管線的影響。通過將數(shù)值模擬結(jié)果與實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比,驗(yàn)證了模型的合理性。進(jìn)一步的研究發(fā)現(xiàn),隧道洞口處的拱頂沉降、初期支護(hù)主應(yīng)力相比隧道其它斷面較大。結(jié)合實(shí)際工程,對(duì)隧道洞口處初期支護(hù)的振動(dòng)響應(yīng)問題進(jìn)行了瞬態(tài)分析。分別研究了在單線車輛荷載和雙線車輛荷載作用下,隧道初期支護(hù)在不同車速、載重下的振動(dòng)響應(yīng)。結(jié)果表明雙線車輛同向行駛的情況下對(duì)結(jié)構(gòu)產(chǎn)生的影響最為不利。此外,車輛相對(duì)行駛相遇時(shí)對(duì)隧道支護(hù)結(jié)構(gòu)產(chǎn)生的振動(dòng)響應(yīng)也較大。文章研究成果對(duì)評(píng)價(jià)隧道結(jié)構(gòu)受車輛荷載的影響,以及對(duì)地鐵隧道結(jié)構(gòu)設(shè)計(jì)理論的完善有一定參考價(jià)值。
[Abstract]:With the rapid development of urban rail transit, urban subway is accelerating construction. At present, shallow excavation method is a common method in urban subway construction. Subway excavation will cause ground movement, resulting in different degrees of displacement and settlement, and the vehicle will also have an impact on the deformation of tunnel structure in the course of driving. However, it is rare to study the influence of surface vehicle load on subway construction in loess area. In view of the above problems, based on the engineering example of Feitian Road ~ Aerospace Avenue Station in Xi'an Metro Line No. 4, this paper adopts the research method of combining field monitoring and numerical simulation. The settlement and deformation of shallow-buried subway tunnel in loess area are studied. The main work is as follows: combined with the site construction of the tunnel to monitor the ground subsidence, vault settlement, horizontal convergence and surrounding rock pressure, through the analysis of the monitoring results, the influence of subway excavation on the tunnel and its surrounding environment is obtained. The numerical model of double-line parallel subway tunnel excavation is established by using ANSYS finite element software, and the influence of tunnel excavation on ground subsidence, initial support and underground pipeline is analyzed. The rationality of the model is verified by comparing the numerical simulation results with the measured data. It is found that the initial support principal stress is larger than that of other sections of the tunnel. Combined with the actual engineering, the transient analysis of the vibration response of the initial support at the tunnel entrance is carried out. In this paper, the vibration response of tunnel initial support at different speed and load is studied under the action of single line vehicle load and double line vehicle load respectively. The results show that the double-track vehicle has the most adverse effect on the structure when it is running in the same direction. In addition, the vibration response of the vehicle to the tunnel support structure is larger when the vehicle meets each other. The research results of this paper have some reference value for evaluating the influence of vehicle load on tunnel structure and improving the design theory of subway tunnel structure.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.4;U231.3

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