【摘要】 地下地震动参数研究是洞室群等地下工程进行抗震设防的关键性基础。通常的地下地震动参数研究针对的是常规场地,而对水电站地下洞室群所特有的高山峡谷工程区域缺乏针对性考虑。以金沙江白鹤滩水电站右岸地下洞室群作为工程实例,从幅值、持时及频谱三大参数角度,对高山峡谷地区洞室群工程区域地震动沿埋深的变化规律进行了研究,并探讨了考虑不同地震动参数的差异。层间错动带及洞室空腔对地震波幅值具有一定程度的减小作用,对频谱特征有近似"低通滤波"的特性,对持时显示出较明显的增加作用,但其机理有待深入研究。高山峡谷地形对地震动幅值和频谱参数的影响较大,对持时参数的影响较小。结果表明,对于高山峡谷地形中的洞室工程,不宜直接搬用常规场地的地震动参数成果。研究成果对西部地区水电站地下厂房洞室群的抗震设计具有一定的参考作用。更多还原

【Abstract】 Ground motion parameter study is a basis for seismic design of underground houses,yet regular sub-ground motions parameter study may ignore the unique alpine gorge topography effect.In this paper,the sub-ground motions parameters for Baihetan underground house is studied from the point of view of amplitude,duration,and spectrum.Differences between various ground motion parameters are discussed.The fault zones possess suppressing effect on amplitude parameters,low-pass filtering effect on spectrum parameters,and enlarging effect on duration parameters,for which further study is required.Influence of alpine gorge topography is significant on amplitude and spectrum,yet negligible on duration.It is suggested that without specialized study,results from regular sub-ground motions parameter study may not be suitable for underground houses in alpine gorge area.更多还原