摘要
在考虑多种断层错动位移模式的基础上,建立穿越活动断裂带的隧洞数值模型,进行跨活断裂隧洞断层错动的数值计算,开展不同断层错动位移模式对隧洞衬砌的变形与内力的影响研究。选择断层带中隧洞结构变形的最可能的模式——固支梁支座垂直位移时梁的结构变形作为断层带错动位移模式,即为"S"型错动位移模式。考虑"S"型与"直线型"两种位移模式对铰接设计隧洞结构变形与内力的影响。结果表明:考虑断层带错动位移模式下,错动作用时衬砌受影响的范围主要集中在断层破碎带附近,衬砌内力峰值出现在断层带与上下盘交界处;断层错动位移模式不同,断层错动时衬砌变形以及所受内力的分布规律基本相同。但衬砌拱顶垂直位移曲线、衬砌所受内力在断层带剧变程度以及峰值大小相差较大;"S"型位移模式相对于"直线型"在对铰接衬砌的变形以及受力上有较大的差异。在进一步研究断层错动位移模式时,可对跨断层隧洞的影响研究上考虑"S"型位移模式。
Based on the consideration of various fault dislocation displacement patterns,this paper first establishes a tunnel numerical model that drills through an active fault zone,then carries out numerical calculation on tunnel shear displacement caused by the active fault,and finally studies the influence of different fault dislocation displacement patterns on the deformation and internal force of tunnel lining.The most probable pattern for deformation of the tunnel structure in the fault zone,that is,the structural deformation of the fixed support beam due to the vertical displacement of the support,is selected as the dislocation displacement mode of the fault zone,namely the "S" type displacement pattern. The influence of "S" type and "linear" type displacement patterns on structural deformation and internal force of the articulated tunnel is considered.The calculation results show that:considering the dislocation displacement pattern of the fault zone,the affected area of the lining under dislocation action is mainly concentrated in the vicinity of the fault fracture zone. The peak lining internal force appears at the ends of the shear zone. The distribution rules of lining deformation and internal forces are basically the same regardless of the displacement patterns of fault dislocation. However,the vertical displacement curve of the lining arch and the variation and the peak value of the internal force of the lining in the fault zone vary greatly for different displacement patterns of fault dislocation. Compared with "linear" displacement pattern, "S" displacement pattern has great difference in deformation and stress of articulated lining. In order to further study the influence of fault dislocation displacement pattern on cross-fault tunnel, "S" displacement pattern can be considered.
作者
周光新
崔臻
盛谦
吴海斌
付兴伟
ZHOU Guangxin;CUI Zhen;SHENG Qian;WU Haibin;FU Xingwei(School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;China Three Gorges Corporation,Beijing 100038,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2021年第6期1323-1330,1349,共9页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(U21A20159,52079133,51991393)
长江科学院开放研究基金资助项目(CKWV2019746/KY)
暨南大学“重大工程灾害与控制”教育部重点实验室(20200904002)资助。
关键词
隧洞
活动断裂带
断层错动位移模式
衬砌变形
“S”型位移模式
tunnel
active fault zone
fault displacement pattern
deformation and internal force response
S-type displacement pattern
