【摘要】：為了有效拓展城市發(fā)展空間，緩解地面交通壓力，太原市于近年開展了地鐵建設(shè)，而地鐵2號線成為太原規(guī)劃的首條地鐵線路。以往實踐表明，城市地鐵建設(shè)容易引起周邊地面的變形，嚴重時可能危及周圍建筑及地下管線的安全。但太原市乃至整個山西地區(qū)此前從未進行過地鐵建設(shè)，針對此類問題沒有相關(guān)的經(jīng)驗可供參考，因此，研究太原地鐵2號線建設(shè)對周邊地面變形的影響是十分必要的。 本文以太原地鐵2號線中心街車站作為對象，收集整理了區(qū)域內(nèi)的自然條件，水文地質(zhì)背景等資料，了解了區(qū)域的地質(zhì)環(huán)境和水文地質(zhì)條件，在項目區(qū)進行了工程勘察，研究了項目區(qū)的工程地質(zhì)及水文地質(zhì)條件，通過野外抽水試驗及室內(nèi)土工試驗，了解了項目區(qū)各個地層的物理力學(xué)指標與滲透性，通過勘察成果及試驗所得數(shù)據(jù)，建立了研究區(qū)域的水文地質(zhì)概念模型。以流固耦合理論為依托，運用FLAC3D將水文地質(zhì)模型轉(zhuǎn)化為空間三維結(jié)構(gòu)模型并分別對不同工況下地層的水平位移與地表的沉降進行了模擬求解。 通過分析上述模擬計算結(jié)果，得出不同工況下基坑在降水與開挖后引起周邊地表變形的規(guī)律：在無支護的情況下，基坑降水開挖7m時，基坑發(fā)生大的水平變形，局部超過5m，基坑發(fā)生坍塌；基坑降水開挖時，基坑開挖面的水平位移相比其他區(qū)域更大；周邊地表的沉降變形以基坑為中心呈環(huán)狀向外擴展，其中基坑角落的區(qū)域變形范圍較大，，為其他位置1.2～1.5倍；地面的沉降變形程度并不是越靠近基坑越大，最大沉降區(qū)域處于距基坑一定距離的位置，模擬顯示，最大沉降區(qū)距基坑邊緣約為7m；相比于不考慮耦合的計算結(jié)果，考慮耦合的計算方式與實際工程更為吻合；根據(jù)模擬結(jié)果，當選用地下連續(xù)墻搭配3道支撐作為支護結(jié)構(gòu)時，地表的水平及沉降變形均減小到要求范圍內(nèi)。 論文成果在一定程度上總結(jié)出了深基坑降水開挖引起周邊地表變形的規(guī)律，為中心街車站合理選擇支護方式以減少對周邊地表變形的影響提供理論依據(jù)，為太原市類似的地鐵工程在如何削弱對周邊環(huán)境不利影響的方面提供了研究思路與方法，積累了研究經(jīng)驗。
[Abstract]:In order to effectively expand the space of urban development and relieve the ground traffic pressure, Taiyuan City has carried out subway construction in recent years, and Metro Line 2 has become the first subway line planned in Taiyuan. The past practice shows that the construction of urban subway is easy to cause the deformation of the surrounding ground, which may endanger the safety of the surrounding buildings and underground pipelines. However, Taiyuan City and even the whole Shanxi area have never carried out subway construction before, so it is necessary to study the influence of Taiyuan Metro Line 2 construction on the surrounding ground deformation. Taking the Central Street Station of Taiyuan Metro Line 2 as the object, this paper collected and sorted out the natural conditions, hydrogeological background and other data in the area, understood the regional geological environment and hydrogeological conditions, and carried out engineering survey in the project area. The engineering geology and hydrogeological conditions of the project area are studied. Through field pumping test and indoor geotechnical test, the physical and mechanical indexes and permeability of each stratum in the project area are understood, and the survey results and the data obtained from the test are obtained. The hydrogeological conceptual model of the study area is established. Based on the fluid-solid coupling theory, the hydrogeological model is transformed into a three-dimensional spatial structural model by FLAC3D, and the horizontal displacement and ground subsidence under different working conditions are simulated and solved respectively. By analyzing the simulation results above, the rules of ground deformation caused by dewatering and excavation under different working conditions are obtained: when the foundation pit is dewatering and excavating for 7 m, the foundation pit has a large horizontal deformation, and the local deformation exceeds 5 m. Collapse of foundation pit; The horizontal displacement of excavation surface is larger than that of other regions during dewatering excavation. The settlement and deformation of the surrounding surface is circumscribed in the center of the foundation pit, and the deformation range in the corner of the foundation pit is larger, which is 1.5 times as large as that in the other positions. The settlement deformation degree of the ground is not more and more close to the foundation pit, and the maximum settlement area is located at a certain distance from the foundation pit. The simulation shows that the maximum settlement area is about 7 m from the edge of the foundation pit. Compared with the calculation results without considering coupling, the calculation method of considering coupling is more consistent with the actual engineering. According to the simulation results, the horizontal and settlement deformation of the ground surface can be reduced to the required range when the underground continuous wall is selected with three braces as the supporting structure. To some extent, the paper summarizes the law of surface deformation caused by dewatering excavation of deep foundation pit, which provides a theoretical basis for the reasonable selection of supporting methods to reduce the influence on the surrounding surface deformation at the central street station. This paper provides the research ideas and methods for the similar subway projects in Taiyuan on how to weaken the adverse effects on the surrounding environment, and accumulates the research experience.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU753.66;TU433

【參考文獻】

相關(guān)期刊論文 前10條

1 陳健;;某臨江超深基坑工程降水計算與設(shè)計分析[J];地下空間與工程學(xué)報;2009年S1期

2 宗金輝;楊路華;張國宗;;天津銅鑼灣廣場深基坑開挖流固耦合分析[J];河北農(nóng)業(yè)大學(xué)學(xué)報;2008年04期

3 許光森;;滲透系數(shù)的簡易計算方法[J];東北水利水電;1992年12期

4 魏婕;李玉岐;;考慮流固耦合效應(yīng)的基坑變形分析[J];低溫建筑技術(shù);2008年02期

5 劉建航,劉國彬,范益群;軟土基坑工程中時空效應(yīng)理論與實踐(下)[J];地下工程與隧道;1999年04期

6 王智勇,周群建,蔡群;深基坑降水對周邊環(huán)境影響分析[J];地下工程與隧道;2000年03期

7 崔亞莉,邵景力,謝振華,賈汀;基于MODFLOW的地面沉降模型研究——以北京市區(qū)為例[J];工程勘察;2003年05期

8 楊天亮;葉觀寶;呂遠強;;地面沉降流固耦合模型在深大基坑降水工程中的應(yīng)用[J];工程勘察;2008年03期

9 孫淑賢;考慮滲流力的基坑涌砂分析[J];工程勘察;1998年02期

10 楊寶珠;仲曉梅;;基于FLAC-3D的深基坑開挖過程數(shù)值分析[J];河北工程大學(xué)學(xué)報(自然科學(xué)版);2008年03期

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