Study on structural deformation characteristics and surface crack distribution of girder tunnel across Lenglongling fault caused by Menyuan earthquake#br#
ZHANG Yufang1，YUAN Kun1，ZHOU Wenjiao1，FAN Jiawei2
(1. Railway Engineering Research Institute，China Academy of Railway Sciences，Beijing 100081，China；2. China Academy of Railway Sciences，Beijing 100081，China)
Abstract：In order to explore the deformation characteristics and stress mechanism of tunnel structure under the dislocation of strike-slip fault，and clarify the mechanical status of strike-slip fault，the distribution rules of surface cracks caused by earthquake in Daliang tunnel are analysed by means of field investigation，geomechanical analysis and numerical simulation. The results show that：(1) the strike of the fault is NW60°，which is consistent with the location of the Lenglongling fault in the region and belongs to the Holocene Active fault. The occurrence of the interrupted layer of the tunnel is 195°∠79°，the width of weak layer is about 100 m，and the size of surface crack dislocation is 3 m. About 700 m to the south of the exit of Daliang tunnel，the horizontal displacement is 2.8 m，and the thrust displacement is 0.91 m，which has the characteristics of thrust strike-slip movement. (2) The mechanical mode of seismic failure is the combined action of NE-SW60° principal stress，unidirectional compression and pure shear. Considering the characteristics of thrust surface deformation at the boundary of the main fracture zone，the surface fractures have a thrust fault orogenic flower shape. (3) Through the analysis of geomechanics，under unidirectional force and moment on the fault，the distribution law of cracks on the surface is consistent with that of field investigation. (4) Before the Menyuan earthquake，the deformation and failure mode of Daliang tunnel was mainly affected by the regional principal compression stress on the direction of on SW60°. After the Menyuan earthquake，it was mainly affected by shearing and compression，and the tunnel structure was subjected to the principal compression stress on the direction of NE-SW60° and the strike-slip shear on the direction of NW60° accorded with Lenglongling fault. The investigation and analysis results provide a reference for the engineering design of high-speed railway tunnels crossing active faults.
张玉芳1，袁 坤1，周文皎1，范家玮2. 门源地震对跨冷龙岭断层的大梁隧道结构变形特征和地表裂缝分布规律研究[J]. 岩石力学与工程学报, 2023, 42(5): 1055-1069.
ZHANG Yufang1，YUAN Kun1，ZHOU Wenjiao1，FAN Jiawei2. Study on structural deformation characteristics and surface crack distribution of girder tunnel across Lenglongling fault caused by Menyuan earthquake#br#. , 2023, 42(5): 1055-1069.
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2023, Vol. 42 
