【摘要】：研究目的:以北京地鐵八號線某區(qū)間隧道盾構(gòu)工程為依托,采用FLAC模擬預(yù)測盾構(gòu)施工引起的地表及其附近建筑物的變形規(guī)律,為盾構(gòu)隧道施工安全通過地表建筑物時的合理施工參數(shù)確定和現(xiàn)場監(jiān)測方案的制定提供技術(shù)支撐。研究結(jié)論:(1)采用數(shù)值模擬得到北京地鐵隧道盾構(gòu)施工引起的地表變形規(guī)律,地表橫向沉降曲線在水平方向上基本對稱,建筑物對其周圍區(qū)域地表變形影響較大,對其所在區(qū)域地表變形影響相對較小,最大差異沉降為8,09 mm;(2)數(shù)值模擬預(yù)測結(jié)果表明兩隧道開挖對地表影響的范圍主要在兩隧道中心左右各36 m,開挖面影響區(qū)域為開挖面前方24 m及開挖面后方20 m范圍內(nèi),施工時應(yīng)重點監(jiān)測;(3)實踐表明實測曲線與數(shù)值模擬曲線吻合較好,數(shù)值模擬是預(yù)測盾構(gòu)施工對地表及鄰近建筑物變形影響規(guī)律的有效手段;(4)研究成果可用于地鐵盾構(gòu)施工對地表鄰近建筑物的變形控制方案的制定。
[Abstract]:The purpose of this paper is to use FLAC simulation to predict the deformation law of the ground surface and nearby buildings caused by shield tunneling based on the shield engineering of a certain section of Beijing Metro Line 8. It provides technical support for the determination of reasonable construction parameters and the formulation of on-site monitoring scheme for shield tunnel construction safely through surface buildings. The conclusions are as follows: (1) numerical simulation is used to get the law of surface deformation caused by shield tunneling in Beijing subway tunnel. The lateral settlement curve of the ground surface is symmetrical in the horizontal direction, and the building has a great influence on the surface deformation in the surrounding area. The influence on the surface deformation of the area is relatively small, and the maximum differential settlement is 80.09 mm;. (2) the results of numerical simulation and prediction show that the influence range of the excavation on the surface of the two tunnels is mainly about 36 m each in the center of the two tunnels, and the influence area of the excavating surface is within 24 m in front of the excavating surface and 20 m behind the excavating surface. (3) practice shows that the measured curve is in good agreement with the numerical simulation curve, and the numerical simulation is an effective method to predict the influence of shield construction on the deformation of the surface and adjacent buildings. (4) the research results can be used to formulate the deformation control scheme of the ground adjacent buildings during the shield tunneling construction.
【作者單位】： 西安科技大學(xué);
【基金】：陜西省教育廳自然科學(xué)專項(2010JK667)資助
【分類號】：U455.43

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