雙孔平行地鐵隧道盾構(gòu)施工地表沉降分布規(guī)律研究
發(fā)布時間：2018-11-22 19:13
【摘要】：盾構(gòu)法施工中不可避免地會對周圍地層產(chǎn)生擾動影響,故加強盾構(gòu)施工變形控制顯得尤為重要。文章以某城市地鐵盾構(gòu)隧道工程為研究背景,采用理論分析和數(shù)值模擬方法,研究了雙孔平行隧道施工地表沉降分布規(guī)律及影響因素,提出了改進的雙線隧道地表沉降預(yù)測方法,并與現(xiàn)場實測數(shù)據(jù)進行了對比分析。研究結(jié)果表明:隧道間距越大,形成"W"形沉降曲線特征越明顯;隧道埋深越小,沉降曲線由"V"形向"W"形轉(zhuǎn)變所需的隧道間距L越小;土質(zhì)條件越好,地層擾動影響范圍越小,"W"形沉降槽特征也越顯著;采用C=L/2i來描述雙線平行隧道地表沉降分布特征是可行的,隨C值增大地表沉降曲線分布由"V"形—"鍋底"形—"W"形發(fā)展,"W"形非對稱性分布特征與隧道相對間距有關(guān);由本文提出的雙線盾構(gòu)施工引起的地表沉降計算公式計算出的地表沉降預(yù)測值與實測沉降曲線吻合較好,可用于雙線隧道施工地表沉降變形預(yù)測,對盾構(gòu)隧道研究具有重要理論指導(dǎo)和實踐意義。
[Abstract]:It is inevitable that the surrounding strata will be disturbed in shield construction, so it is very important to strengthen the deformation control of shield construction. Taking the shield tunneling project of a city subway as the research background, this paper studies the distribution law of ground surface settlement and its influencing factors in the construction of two-hole parallel tunnel by using theoretical analysis and numerical simulation method. In this paper, an improved method for predicting the surface settlement of two-line tunnel is proposed and compared with the field measured data. The results show that the larger the tunnel spacing, the more obvious is the characteristic of forming "W" shape settlement curve, and the smaller the tunnel depth is, the smaller the tunnel spacing L is required for the transition from "V" shape to "W" shape. The better the soil condition is, the smaller the influence range of formation disturbance is, and the more obvious are the characteristics of "W" shaped subsidence trough. It is feasible to use C=L/2i to describe the distribution characteristics of surface settlement of double-line parallel tunnels. With the increase of C value, the distribution of surface settlement curve develops from "V" shape to "pot bottom" shape to "W" shape. The asymmetry distribution of "W" shape is related to the relative distance between tunnels. The predicted value of surface settlement calculated by the formula proposed in this paper is in good agreement with the measured settlement curve, which can be used to predict the surface settlement deformation of double-line tunnel construction. It has important theoretical guidance and practical significance for shield tunnel research.
【作者單位】： 中南大學(xué)土木工程學(xué)院;中建五局土木工程有限公司;廈門軌道交通集團有限公司;
【基金】：國家自然科學(xué)基金資助項目(51478484,51308551,51678571) 中南大學(xué)中央高校基本科研業(yè)務(wù)費專項基金資助項目(2016zzts063) 中建五局土木工程有限公司基金資助項目(02012016YN77)
【分類號】：U231.3;U455.43
本文編號：2350285
[Abstract]:It is inevitable that the surrounding strata will be disturbed in shield construction, so it is very important to strengthen the deformation control of shield construction. Taking the shield tunneling project of a city subway as the research background, this paper studies the distribution law of ground surface settlement and its influencing factors in the construction of two-hole parallel tunnel by using theoretical analysis and numerical simulation method. In this paper, an improved method for predicting the surface settlement of two-line tunnel is proposed and compared with the field measured data. The results show that the larger the tunnel spacing, the more obvious is the characteristic of forming "W" shape settlement curve, and the smaller the tunnel depth is, the smaller the tunnel spacing L is required for the transition from "V" shape to "W" shape. The better the soil condition is, the smaller the influence range of formation disturbance is, and the more obvious are the characteristics of "W" shaped subsidence trough. It is feasible to use C=L/2i to describe the distribution characteristics of surface settlement of double-line parallel tunnels. With the increase of C value, the distribution of surface settlement curve develops from "V" shape to "pot bottom" shape to "W" shape. The asymmetry distribution of "W" shape is related to the relative distance between tunnels. The predicted value of surface settlement calculated by the formula proposed in this paper is in good agreement with the measured settlement curve, which can be used to predict the surface settlement deformation of double-line tunnel construction. It has important theoretical guidance and practical significance for shield tunnel research.
【作者單位】： 中南大學(xué)土木工程學(xué)院;中建五局土木工程有限公司;廈門軌道交通集團有限公司;
【基金】：國家自然科學(xué)基金資助項目(51478484,51308551,51678571) 中南大學(xué)中央高校基本科研業(yè)務(wù)費專項基金資助項目(2016zzts063) 中建五局土木工程有限公司基金資助項目(02012016YN77)
【分類號】：U231.3;U455.43
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