Study on the law and computational method of ground surface settlement induced by double-line tunnel excavation
LU Jian1，YAO Aijun1，ZHENG Xuan2，ZHANG Jiantao3，4，TIAN Tian1
(1. The Key Laboratory of Urban Security and Disaster Engineering，Ministry of Education，Beijing University of Technology，Beijing 100124，China；2. China Nuclear Power Engineering Co.，Ltd.，Beijing 100840，China；3. China Academy of Building Research，Beijing 100013，China；4. CABR Foundation Engineering Co.，Ltd.，Beijing 100013，China)
Abstract：Based on the numerical simulation method and the field measured data，the law and computational method of the ground surface settlement initiated by the excavation of the double-line tunnel located in the upper-soft and lower-hard stratum are studied. The results show that after the completion of the tunnel excavation，the lateral settlement curve of the ground surface is asymmetrically distributed. The ground surface settlement above the preceding tunnel is larger than the ground surface settlement above the rear tunnel. During the excavation of the double-line tunnel，the location of the maximum settlement of ground surface gradually moves from the centerline of preceding tunnel to the direction of the rear tunnel，and the settlement mainly occurs before the trailing tunnel crosses the monitoring section. The numerical simulation results indicate that the depth and spacing of the tunnel significantly influence the ground surface settlement. Therefore，the influence of tunnel depth and tunnel spacing on ground surface settlement is recommended to be fully considered during tunnel design stage. In addition，the non-linear fitting analysis of orthogonal experimental results presents that the parameter i in the calculation formula of ground surface settlement is independent of the tunnel excavation order，and the maximum settlement ratio γ decreases slightly with the increase of tunnel spacing. When the staggered distance of the excavation is within the longitudinal influence range of tunnel excavation，γ has a little change. Accordingly，the parameter γ is introduced to improve the calculation formula of ground surface settlement for double-line tunneling scenarios，and the calculation formula is validated by comparing the calculated results with the measured data.
卢 健1，姚爱军1，郑 轩2，张剑涛3，4，田 甜1. 地铁双线隧道开挖地表沉降规律及计算方法研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3735-3747.
LU Jian1，YAO Aijun1，ZHENG Xuan2，ZHANG Jiantao3，4，TIAN Tian1. Study on the law and computational method of ground surface settlement induced by double-line tunnel excavation. , 2019, 38(S2): 3735-3747.
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2019, Vol. 38 
