摘要
小净距双线隧道施工将诱发地层不对称沉降,从而引起运营盾构隧道非对称沉降变形。利用两阶段分析法,考虑先后隧道施工相互影响,提出了小净距双线隧道下穿施工诱发运营盾构隧道纵向变形的简化预测方法。首先,考虑隧道前后施工对地层叠加扰动影响,建立双线隧道施工诱发地表沉降和深层沉降的简化预测方法;其次,将隧道开挖引起的自由土体沉降施加于既有盾构隧道之上,通过有限差分法得到既有隧道纵向变形的数值解答;最后,与既有工程实测数据对比,验证了所提方法的可靠性。所得结论能为相关工程提供一定的理论支持。
The excavation of twin tunnels in close clearance may cause the unsymmetrical settlement of the soil and the unsymmetrical longitudinal displacement of the in-service shield tunnels. Using the two-stage analysis method, a simplified analytical method is proposed to predict the longitudinal displacements of in-service shield tunnels due to the construction of the twin tunnels beneath it, which can consider the influences of the interaction between the construction of the twin tunnels. First, considering the overlapped impacts of first and subsequent tunnelling on the ground disturbance, a simplified prediction method for estimation of the surface settlement and subsurface settlements caused by the construction of the twin tunnels is proposed. Second, by imposing the induced free ground settlement on the existing shield tunnel, the longitudinal displacement of existing shield tunnel is solved numerically by using the finite difference method. Eventually, the effectiveness of the proposed method is verified by measured data from a case study.The conclusions may provide some theoretic basis for correlative engineering.
作者
吕金剑
李忠超
龙华东
梁荣柱
陈峰军
程康
Lyu Jinjian;Li Zhongchao;Long Huadong;Liang Rongzhu;Chen Fengjun;Cheng Kang(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Wuhan Muicipal Construction Group Co.Ltd.,Wuhan 430023,China;China Railway 11th Bureau Group Co.Ltd.,Wuhan 430061,China;Shanghai Construction Group Co.Ltd.,Shanghai 200080,China)
出处
《科技通报》
2022年第11期94-100,共7页
Bulletin of Science and Technology
基金
国家自然科学基金资助项目(41807262)
上海市科学技术委员会科研计划项目(18DZ1205106)。
关键词
双线隧道
既有隧道
深层沉降
隧道沉降
twin tunnels
existing tunnel
subsurface settlement
tunnel settlement
