Study on transverse deformation and cracking property of shield-driven tunnel induced by adjacent excavation
YANG Yubing1，ZHOU Biao2，XIE Xiongyao2
(1. College of Water Conservancy and Civil Engineering，South China Agricultural University，Guangzhou，Guangdong 510642，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China)
Abstract：The left shield tunnel between two stations of Ningbo metro line No.1 was damaged as a result of adjacent excavation. Cracks，concrete spalling and chipping appeared in the reinforced concrete segments due to the large displacement and transverse deformation of tunnel. The damage and cracking characteristics of this tunnel was summarized according to results of the on-site inspection and measurement. The transverse deformation and cracking property of shield tunnel induced by the adjacent excavation was numerically and separately studied，and the tendency of cracking was also numerically predicted. The numerical prediction of the vertical convergence was lower than the field data，and the rigid body displacement was mainly induced by the dewatering inside the excavation pit. The transverse deformation mode of tunnel lining ring，“horizontal oval”，actually determines its cracking range. The crown and invert of tunnel were the most vulnerable positions. The relative maximum crack width appeared around these positions. These predictions were agreed well with the field observations. The macro cracks at the invert of tunnel would run through the depth of reinforce concrete segment and become penetrating cracks if the increment of vertical convergence reached up to 1% tunnel external diameter.
杨雨冰1，周 彪2，谢雄耀2. 邻近基坑施工作用下盾构隧道横向变形及开裂特性研究[J]. 岩石力学与工程学报, 2016, 35(S2): 4082-4093.
YANG Yubing1，ZHOU Biao2，XIE Xiongyao2. Study on transverse deformation and cracking property of shield-driven tunnel induced by adjacent excavation. , 2016, 35(S2): 4082-4093.
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2016, Vol. 35 
