盾构隧道叠置下穿地下道路的施工变形规律研究  

Research on the construction deformation induced by shield tunneling with an underground road overlapped on it

作　　者：杨潇[1] 李明宇[2] YANG Xiao;LI Mingyu(College of Civil Engineering,Tongji University,Shanghai,200092,China;College of Civil Engineering,Zhengzhou University,Henan Zhengzhou,450001,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]郑州大学土木工程学院,河南郑州450001

出　　处：《河北工程大学学报（自然科学版）》2018年第3期49-53,共5页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金项目(51508520)

摘　　要：在盾构近接工程中,既有地下道路正下方进行盾构下穿具有极大的施工风险。考虑盾构施工中隧道、土和地下道路的变形耦合作用,采用有限差分法,建立了盾构叠置下穿地下道路施工的三维数值计算模型,对盾构施工引起的周边土体位移和地下结构变形展开研究。结果表明,盾构施工主要引起了三面围合区域内部的土体位移,而在围合区域外部几乎没有土体移动,在隧道中轴线上方地下道路的顶板和底板发生较大的附加变形,三面围合下隧道衬砌环的横鸭蛋变形相比半无限空间中有所减弱。In shield tunneling approaching projects,the construction activities are of large risks for shield tunneling with an underground road overlapped on it. Considering the coupling deformation of tunnel and underground road,the analysis-calculation model of shield tunneling below an underground road is established with Finite-Difference-Method. Thus,soil movement and underground structure deformation can be acquired. The results show that soil movement appears mainly in three enveloped area. For underground road,the additional deformation is much heavier on the top plate and bottom plate above the tunnel crown. Moreover,the“horizontal egg”deformation of shield lining for three enveloped situation decreases compared with semi-infinite situation.

关 键 词：盾构隧道 地下道路 叠置下穿 有限差分法 施工变形 

分 类 号：U452[建筑科学—桥梁与隧道工程]