CAJ | 학술논문

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。
지하결구시수전참지하엄방항진설계적관건，아국현행규범상미대기항진설계방법작출명학규정。결합문천지진중영수만지하엄방결구진재조사，채용의정역법、반응보법화시정법분별진행결구수력계산。결과표명，3충방법균능재일정정도상반응영력하재작용하지하결구적파배정황，위항진설계제공이론의거。의정역법계산결과편안전，단기대정공、우퇴등국부결구계산유일정불합리지처；반응보법능전현결구적박약부위，편우항진가고，단재여위암접촉적결구분석중존재교대오차；시정법능정세반영지하결구적지진수력과정，계산결과여진해조사문합교호，편우경위경제적공정설계。건의대안전급별고、규모대혹처우고지진열도구역적지하엄방결구채용시정법진행계산。
According to numerous in-situ investigations of earthquake disasters, it is widely regarded that underground structure is of key significance for seismic design of underground cavern. Since no specified simulation methods are definitely issued in the specifications for seismic design of hydraulic structures in China, three common seismic calculation methods of underground structure including quasi-static analysis method, response spectrum method and time-history method are discussed. Numerical calculation are conducted using these methods for underground powerhouse structures of Yingxiuwan hydropower station under Wenchuan earthquake; and calculation results are analyzed based on the in-situ investigation of earthquake disasters. The results show that three methods can reflect the dynamic failure of underground structures to some extent and provide a theoretical basis for the seismic design. It is also shown that the calculation results of the quasi-static analysis method is prior to more safer design and unreasonable for simulating top arch and corbel; response spectrum method can estimate weak parts of structure, but not exactly in interaction analysis of concrete structure and surrounding rock; time-history method is able to precisely simulate the seismic response process under the earthquake disaster; and calculation result is best consistent with in-situ investigation of earthquake disasters, which is better for precise and economic engineering design. Time-history method is suggested to be used for dynamic calculation for the underground powerhouse of high level security, large-scale or in high seismic intensity region.