本文關鍵詞： 地鐵隧道 盾構開挖 附加應力場 地表沉降 Peck公式 隨機介質(zhì)理論 參數(shù)反演 數(shù)值模擬　出處：《中南大學》2014年碩士論文　論文類型：學位論文

【摘要】：摘要：隨著全國城市地下軌道建設的興起,地鐵隧道盾構開挖由于其廣泛的地層適用性以及經(jīng)濟優(yōu)越性而得到迅速的發(fā)展,成為全國各大城市地鐵建設的首要選擇。為研究盾構開挖對周圍土體影響,控制地鐵隧道盾構開挖對地表沉降變形以及對周圍建筑物變形影響,需要對隧道盾構開挖所引起的周圍土體附加應力以及地表沉降規(guī)律進行分析,獲得區(qū)域性盾構施工經(jīng)驗,為類似地層地鐵隧道盾構施工提供理論背景,以確保盾構開挖時地表建筑物的安全性和適用性。本文結合南京三號線常府街-夫子廟區(qū)間地鐵隧道土壓平衡式盾構施工項目,采用彈性理論解研究了隧道盾構開挖對周圍土層產(chǎn)生的附加應力場；運用隨機介質(zhì)理論、Peck公式以及數(shù)值計算分析了隧道盾構開挖所引起的地表以及建筑物沉降變形。本文主要研究內(nèi)容如下： 1.對隧道開挖區(qū)間段盾構施工參數(shù)以及地表沉降值進行統(tǒng)計分析,并結合統(tǒng)計結果評價盾構施工在所研究土層段的施工質(zhì)量；整理所研究開挖區(qū)間段地表縱向及橫向沉降測點實測沉降值,獲得了完整的現(xiàn)場實測資料。 2.結合南京地鐵三號線常府街-夫子廟區(qū)間段右線盾構開挖實例,采用彈性力學Mindlin公式在土體中一點的應力解以及源匯法,對盾構施工區(qū)域面積進行積分,獲得盾構開挖面附加推力、盾殼與周圍土體之間的摩擦力以及盾尾土體損失對周圍土體所引起的附加應力場分布區(qū)域以及規(guī)律。 3.結合隧道盾構開挖導致的地面縱向沉降點按施工時序所產(chǎn)生的沉降曲線,分析了盾構推進時地表沉降五個階段的變化規(guī)律。應用Peck公式、隨機介質(zhì)理論,分別通過最小二乘法、Powell優(yōu)化法反演其縱向沉降公式計算參數(shù),并正算隧道盾構開挖所導致的地表橫向沉降曲線并與實測橫向沉降曲線進行對比,所得結果與實測值基本一致,證實了所獲得的反演參數(shù)的正確性,能用以指導盾構施工。考慮地表沉降槽范圍內(nèi)建筑物結構剛度對地表沉降槽分布的影響,結合工程實例,利用修正的Peck公式計算建筑物沉降曲線,并與Peck公式計算地表沉降曲線進行對比分析,得出修正Peck公式計算結果更接近現(xiàn)場實測值。 4.應用大型通用有限元軟件ABAQUS建立三維模型分析了雙線隧道盾構施工分步開挖導致周圍土體附加應力分布規(guī)律,以及其對地表沉降的影響,并與理論計算值以及實測值進行對比分析以指導施工。圖78幅,表34個,參考文獻91篇
[Abstract]:Absrtact: with the rise of urban underground track construction in China, shield tunneling of subway tunnel has been developed rapidly because of its wide ground applicability and economic superiority. In order to study the influence of shield excavation on surrounding soil mass, to control the influence of shield excavation on ground subsidence and deformation of surrounding buildings, It is necessary to analyze the additional stress of surrounding soil and the law of ground subsidence caused by shield tunneling in order to obtain the experience of regional shield construction and provide the theoretical background for the shield construction of subway tunnel in similar strata. In order to ensure the safety and applicability of the surface buildings during shield excavation, this paper combines the earth pressure balance shield construction project of the subway tunnel in Changfujie-Fuzimiao section of Nanjing No.3 line. The additional stress field caused by shield tunneling is studied by using elastic theory. The surface and building settlement deformation caused by shield tunneling is analyzed by using Peck formula of stochastic medium theory and numerical calculation. The main contents of this paper are as follows:. 1. Statistical analysis of shield construction parameters and surface settlement value of tunnel excavation section, and evaluation of the construction quality of shield construction in the studied soil layer combined with statistical results; The measured settlement values of the longitudinal and transverse settlement measuring points in the excavation section are sorted out, and the complete field measured data are obtained. 2. With the example of shield excavation in the section of Changfujie Fumiao section of Nanjing Metro Line No. 3, the area of shield construction area is integrated by using the stress solution of one point of elastic mechanics Mindlin formula in soil and the method of source and sink. The additional thrust of shield excavation surface, the friction between shield shell and surrounding soil, and the distribution of additional stress field caused by the loss of shield tail soil to surrounding soil are obtained. 3. According to the settlement curve produced by the construction time series, the variation law of the five stages of ground subsidence during shield tunneling is analyzed. The Peck formula and stochastic medium theory are applied to analyze the variation of the ground longitudinal settlement points caused by shield tunneling. The parameters of the longitudinal settlement formula are inversed by the least square method and Powell's optimization method respectively, and the transverse settlement curves caused by shield tunneling are calculated and compared with the measured transverse settlement curves. The results are in good agreement with the measured values. It is proved that the obtained inversion parameters are correct and can be used to guide shield construction. Considering the influence of structural stiffness on the distribution of ground subsidence trough in the range of ground subsidence trough, the paper combines with an engineering example. The modified Peck formula is used to calculate the settlement curve of buildings and compared with the Peck formula to calculate the surface settlement curve. The calculated results of the modified Peck formula are closer to the field measured values. 4. The three-dimensional model is established by using ABAQUS, which is a general finite element software. The distribution law of additional stress in surrounding soil caused by two-line shield tunneling and its influence on surface settlement are analyzed. In order to guide construction, 78 figures, 34 tables and 91 references were compared with theoretical calculated values and measured values.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.43;U231.3

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