摘要
研究地面出入式盾构隧道施工引起的土体变形计算方法.建立隧道上浮至土体边界顶部的隧道开挖断面收敛模型,基于随机介质理论,推导出浅覆土地面出入式盾构隧道施工时由于土体损失引起的土体变形计算公式.通过实例对所提出的方法进行了验证,并研究了盾构轴线与水平面的夹角α不同对土体变形的影响.研究结果表明:采用本文方法得出的地表沉降预测结果与实测值及有限元模拟值吻合较好,土体水平变形预测结果与实测值基本吻合,证明了方法的可靠性;随着α增大,盾构上仰掘进时,由土体损失引起的纵向地表沉降呈减小趋势,而横向地表沉降曲线影响范围变大;盾构下探掘进时,纵向地表沉降呈增大趋势;本文方法适用于地面出入式盾构法施工中浅覆土段(≤0.5倍的盾构机外直径)的土体变形预测.
The method to calculate the soil deformation during ground penetrating shield tunnelling is investigated in this paper.Convergence model of tunnel excavation section when tunnel floats on top of soil boundary is established.Based on stochastic medium theory,the ground loss-induced soil deformation formula during construction of ground penetrating shield tunnel is deduced.The results of the proposed method are demonstrated by an example.Besides,the influence of the angle,namedα,which is between the shield axis and the horizontal plane on soil deformation is studied.The results show that the predicted surface settlement in this method is consistent with the actual measurements and the finite element simulation values.In addition,the predicted horizontal displacement in this method matches with the actual measurements mostly.As a result,the method is proved reliable.With the increase ofα,the longitudinal ground loss-induced surface settlement decreases,and the influence range of the horizontal surface settlementcurve widens when the shield is driving upwards.However,the longitudinal surface settlement tends to increase when the shield is driven downwards.The method can be applied to predict soil deformation in the shallow cover section(which means the cover is less than or equal to 0.5 times of outside diameter of the shield)in the construction of ground penetrating shield tunnels.
作者
魏纲
黄文
WEI Gang;HUANG Wen(School of Engineering,Zhejiang University City College,Hangzhou 310015,China)
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2019年第3期35-42,73,共9页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
浙江省科技厅公益技术研究项目(2016C33051)
住房和城乡建设部2015年科学技术项目计划(2015-K5-026)~~
关键词
地面出入式盾构
土体变形
随机介质理论
浅覆土
ground penetrating shield
soil deformation
stochastic medium theory
shallow cover
