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  本文選題：盾構(gòu)隧道 + 地表沉降��； 參考：《寧波大學(xué)》2014年碩士論文

【摘要】：盾構(gòu)法施工技術(shù)具有機械化程度高、掘進速度快、對地層擾動相對較小、環(huán)境影響程度低等特點，在城市軌道交通工程中受到廣泛應(yīng)用。盡管，盾構(gòu)法施工較明挖隧道擾動小，但仍然對土層有一定擾動，對隧道、管線、路面、臨近建筑物和構(gòu)筑物都會產(chǎn)生一系列不利影響。由于寧波屬于軟土地區(qū)，場地施工條件并不是很好，地下水位高，土層的含水率高，軟土壓縮性高、強度低、靈敏度高、透水性低，無論是設(shè)計還是施工均缺少盾構(gòu)法施工對周邊環(huán)境影響規(guī)律的研究和道路與地表建筑物沉降控制及其防治技術(shù)的經(jīng)驗，尚存在許多需要深究的技術(shù)問題。為此，本文以寧波軌道交通1號線和2號線部分區(qū)間為工程背景，研究了土壓平衡盾構(gòu)在寧波地區(qū)施工引起的地表和深層土體的變形特征。主要內(nèi)容包括： 1、選取典型區(qū)間監(jiān)測斷面，結(jié)合所處地層特性和盾構(gòu)施工參數(shù)，，對盾構(gòu)掘進過程中各斷面的單線橫向地表沉降特征、雙線橫向地表沉降特征以及隨著盾構(gòu)推進縱向地表沉降變化特征進行了分析研究。 2、選取典型區(qū)間監(jiān)測斷面，結(jié)合所處地層特性和盾構(gòu)施工參數(shù)，對盾構(gòu)掘進對深層土體在垂直于盾構(gòu)軸線方向的水平位移進行了研究，并得到了盾構(gòu)開挖對周邊深層土體的影響范圍。 3、統(tǒng)計了100組單線地表橫向沉降數(shù)據(jù)，采用最小二乘法和一元線性回歸對實測沉降槽曲線進行擬合，并與Peck預(yù)測公式相比較，反算得出沉降槽寬度系數(shù)K和地層損失率Vl的分布范圍和概率密度，并給出建議值。 4、采用Flac3D有限差分程序，對盾構(gòu)開挖過程進行了模擬。引入了等代層模擬盾構(gòu)管片外圍漿液與土的混合物，考慮了盾尾壁后注漿后漿液硬化、漿液壓力消散過程，運用理論與數(shù)值計算軟件推導(dǎo)出了在不同注漿壓力下漿液壓力的變化方程，分析和總結(jié)了注漿量、注漿壓力、土艙壓力三個因素對地表沉降的影響規(guī)律，并將實測值與計算值對比分析。
[Abstract]:Shield construction technology is widely used in urban rail transit engineering because of its high degree of mechanization, high speed of excavation, relatively small disturbance to strata and low degree of environmental impact. Although the shield tunneling method has less disturbance than the open excavation tunnel, it still has a certain disturbance to the soil layer, which will have a series of adverse effects on the tunnel, pipeline, road surface, adjacent buildings and structures. Because Ningbo belongs to the soft soil area, the site construction condition is not very good, the underground water level is high, the soil moisture content is high, the soft soil compressibility is high, the strength is low, the sensitivity is high, the water permeability is low, Both design and construction lack the research on the influence law of shield construction on the surrounding environment, the experience of settlement control and prevention technology of road and surface buildings, and there are still many technical problems that need to be studied deeply. In this paper, the deformation characteristics of surface and deep soil mass caused by earth pressure balance shield tunneling in Ningbo area are studied in the background of some sections of Ningbo Rail Transit Line 1 and Line 2. The main elements include: 1. Select the monitoring section of typical section, combine the stratigraphic characteristics and shield construction parameters, and analyze the single line lateral surface subsidence characteristics of each section during shield tunneling. The characteristics of horizontal surface subsidence along double lines and the variation characteristics of longitudinal surface subsidence with shield tunneling are analyzed and studied. 2. Selecting the monitoring section of typical section, combining the characteristics of stratum and the parameters of shield construction, the horizontal displacement of deep soil in the direction perpendicular to the axis of shield tunneling is studied. The influence range of shield excavation on surrounding deep soil is obtained. (3) 100 groups of lateral surface subsidence data of single line are counted, and the measured settlement trough curve is fitted by least square method and linear regression, and compared with Peck prediction formula. The distribution range and probability density of subsidence trough width coefficient K and formation loss rate Vl are obtained and the suggested values are given. 4. The excavation process of shield is simulated by Flac3D finite difference program. The equivalent layer is introduced to simulate the mixture of slurry and soil around the shield segment, and the process of slurry hardening and slurry pressure dissipation is considered. The variation equation of grouting pressure under different grouting pressure is deduced by using theory and numerical calculation software. The influence of grouting quantity, grouting pressure and soil chamber pressure on surface subsidence is analyzed and summarized. The measured value is compared with the calculated value.
【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43

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