摘要
文章基于Plaxis 3D软件建立了双圆盾构隧道掘进的数值模型。在不考虑盾尾注浆和开挖面稳定等因素下,研究了不同覆径比和双圆盾构机有无竖向支撑情况下的地表沉降和隧道周围土体变形。结果表明,由于海鸥型管片处的背土效应加剧了盾构对周围土层的扰动,在仅采用钢壳模拟双圆盾构机的情况下,盾构掘进引起的地层沉降较大。随着覆径比的增大,隧道上覆土层重量的增加使得双圆盾构施工引起的地表沉降槽变深、变宽。当盾构机内部存在竖向支撑时,支撑将隧道上方土体的沉降与下方土体的隆起中和“抵消”,从而有效提升双圆盾构机的竖向承载能力,减小周围地层的变形。
Based on Plaxis 3D software,the numerical model of DOT is established.Without considering the factors of shield tail grouting and excavation face stability,the ground surface settlement and soil deformation around the tunnel with different cover-diameter ratios and the machine of DOT with or without internal support are studied.The results show that the piggyback soil effect at the seagull segment aggravates the disturbance of the shield to the surrounding soil layer.In the case of only using steel shell to simulate the double circular shield machine,with the increase of the cover-diameter ratio,the weight of the overburden soil layer increases,which makes the ground surface settlement trough deeper and wider.The vertical support inside the shield machine is simulated.By changing the compressive stiffness of the support,the vertical bearing capacity of the double circular shield machine is effectively controlled.The support neutralizes the settlement of the soil above the tunnel and the uplift of the soil underneath so as to improve the soil deformation.
作者
温瑜琴
苏栋
邓碧
王雪涛
WEN Yuqin;SU Dong;DEND Bi;WANG Xuetao;CHEN Xiangsheng(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060;Underground Polis Academy,Shenzhen University,Shenzhen 518060)
出处
《现代隧道技术》
EI
CSCD
北大核心
2020年第S01期450-457,共8页
Modern Tunnelling Technology
基金
广东省重点领域研发计划项目(2019B111105001)
国家自然科学基金项目(51938008).
关键词
双圆盾构
数值模拟
地表沉降
地铁
DOT shield
Numerical simulation
Ground surface settlement
Metro
