摘要
盾构超挖引发土体损失,将会对地表产生不同程度沉降。为了探究出土体损失率和隧道中心点沉降值之间的关系,通过盾构超挖模型实验,考虑埋深和土体损失率因素对地表沉降变化规律的影响。研究结果表明:1D、2D和3D位置的土体损失率和隧道中心点的沉降值呈现二次曲线关系且对地表沉降程度呈现逐步变缓的趋势;随着埋深深度的增加,地表隧道中心点的沉降值在减小,在最大土体损失率为12%情况下,随着隧道管埋深位置从1D至3D,隧道正上方地表中心点沉降值从5.86 mm降低至3.55 mm;随着埋深深度和土体损失率的增加,地表沉降槽逐渐增宽并趋于稳定,砂土沉降槽宽度在20 cm-40 cm之间。该结果将对城市交通盾构施工对地表沉降控制提供借鉴作用。
Soil loss caused by over-excavation of shield will result in different degrees of settlement on the surface.In order to explore the relationship between the soil loss rate and the settlement value of the tunnel center point,the influ ence of the buried depth and soil loss rate factors on the surface subsidence change law is considered through the shield over-excavation model experiment.The results show that the soil loss rate at 1D,2D and 3D positions and the settle ment value at the center point of the tunnel show a quadratic curve and the degree of surface subsidence gradually slows down;with the increase of the buried depth,the surface tunnel center The settlement value of the point is de creasing.When the maximum soil loss rate is 12%,the settlement value of the center point of the surface of the tunnel is reduced from 5.86mm to 3.55mm as the buried depth of the tunnel tube is from 1D to 3D.The depth of the buried depth and the loss rate of the soil increase,the surface settlement trough gradually widens and tends to be stable,and the sand subsidence trough width is between 20cm-40cm.The result will provide a reference for the control of surface settlement of urban traffic shield construction.
作者
黄赵美
曹广勇
李秉坤
马海军
HUANG ZhaoMei;CAO GuangYong;LI BingKun;MA HaiJun(School of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China;Anhui Key Laboratory of Building Structure and Underground Engineering,Anhui Jianzhu University,Hefei 230601,China)
出处
《安徽建筑大学学报》
2019年第4期13-16,58,共5页
Journal of Anhui Jianzhu University
关键词
模型试验
沉降值
盾构隧道
砂土
model test
settlement value
shield tunnel
sand
