水电站地下厂房结构抗震计算方法探讨

发布时间：2018-01-12 21:12

本文关键词：水电站地下厂房结构抗震计算方法探讨　出处：《岩土力学》2014年S1期 　论文类型：期刊论文

【摘要】：地下结构是水电站地下厂房抗震设计的关键,我国现行规范尚未对其抗震设计方法作出明确规定。结合汶川地震中映秀湾地下厂房结构震灾调查,采用拟静力法、反应谱法和时程法分别进行结构受力计算。结果表明,3种方法均能在一定程度上反应映力荷载作用下地下结构的破坏情况,为抗震设计提供理论依据。拟静力法计算结果偏安全,但其对顶拱、牛腿等局部结构计算有一定不合理之处;反应谱法能展现结构的薄弱部位,便于抗震加固,但在与围岩接触的结构分析中存在较大误差;时程法能精细反映地下结构的地震受力过程,计算结果与震害调查吻合较好,便于更为经济的工程设计。建议对安全级别高、规模大或处于高地震烈度区域的地下厂房结构采用时程法进行计算。
[Abstract]:The underground structure is the key to the seismic design of underground powerhouse of hydropower station. The current code of our country has not made the clear stipulation to its aseismic design method, combined with the earthquake disaster investigation of Yingxiu Bay underground powerhouse structure in Wenchuan earthquake. The quasi-static method, the response spectrum method and the time-process method are used to calculate the structural forces respectively. The results show that the three methods can reflect the failure of underground structures under enantiomeric load to a certain extent. It provides theoretical basis for seismic design. The results of pseudostatic method are relatively safe, but there are some unreasonable points in the calculation of local structures such as roof arch, corbel leg and so on. The response spectrum method can show the weak part of the structure, which is convenient for seismic reinforcement, but there is a big error in the analysis of the structure in contact with the surrounding rock. The time-log method can accurately reflect the seismic stress process of underground structure, and the calculated results are in good agreement with the seismic damage investigation, which is convenient for the more economical engineering design. It is suggested that the safety level be high. The structure of underground powerhouse with large scale or high seismic intensity is calculated by time-process method.
【作者单位】：长江设计院;武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家重点基础研究发展计划973项目资助(No.2010CB732005) 国家自然科学基金重大研究计划资助(No.91215301);国家自然科学基金资助(No.51279136,No.51209164) 中央高校基本科研业务费专项资金资助(No.2012206020203)
【分类号】：TV731.6
【正文快照】： 1引言我国西南地区兴建了一批大型水电站地下厂房洞室群。该地区属于地震多发带,地震烈度一般在VII度以上,地下厂房洞室的抗震性能直接关系到生成设备的正常运行和工作人员的生命安全。对汶川大地震震中区域映秀湾、渔子溪和耿达等水电站地下厂房洞室群的震后调查表明[1],(1)

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