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宏观结构面影响下水工隧洞地震响应分析

Dynamic Response Analysis of Hydraulic Tunnel under the Influence of Macroscopic Structural Plane
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摘要 针对地下工程中常见的非连续性岩体结构面,建立了一种等厚度薄层单元数学模型,并在此基础上提出了模拟宏观结构面的三维弹塑性数值模拟分析方法。针对云南省干河泵站引水隧洞软弱破碎段进行地震响应分析,研究了宏观结构面影响下水工隧洞的围岩破坏和支护结构受力特性。计算结果表明:结构面穿过区域,围岩破坏程度加剧,破坏深度和体积显著增加;水平向地震荷载作用下,衬砌结构腰墙部位的变形和应力明显大于顶拱和底拱,是抗震设计的薄弱环节;结构面穿过区域衬砌变形和应力明显增加,且结构面两侧受力呈现非对称型式,上盘大于下盘。 Aiming at the discontinuous rock mass structural plane in underground engineering,a mathematical model of equal-thickness thin layer element is established,and on this basis,a three-dimensional elastic-plastic numerical simulation analysis method for simulating the macroscopic structural planes is proposed.Based on the seismic response analysis of the weak broken section of Ganhe Pumping Station s diversion tunnel in Yunnan Province,the failure of surrounding rock and the stress characteristics of supporting structure under the influence of macroscopic structural plane are studied.The calculation results indicate that:(a)when the structural plane passes through the region,the failure degree of surrounding rock is aggravated,and the failure depth and volume are increased significantly;(b)under the horizontal seismic load,the deformation and stress of the waist wall in the lining structure are obviously larger than that of the top arch and bottom arch,which is the weak link of seismic design;and(c)the deformation and stress of the lining where the structural plane passes through are significantly increased,and the forces on both sides of the structural plane are asymmetrical,where the hanging wall is larger than the footwall.
作者 邓建 谢冰冰 DENG Jian;XIE Bingbing(Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,Hubei,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,Hubei,China)
出处 《水力发电》 CAS 2021年第11期57-63,共7页 Water Power
基金 国家重点基础研究发展计划(973)项目(2015CB057-904) 自主创新项目(CX2019Z29)。
关键词 结构面 弹塑性 水工隧洞 地震响应 围岩 变形 应力 structural plane elastic-plastic hydraulic tunnel seismic response surrounding rock deformation stress
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