大型地下洞室群地震水平加速度传播特征研究
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摘要
考虑了高山峡谷基岩场地的深度衰减效应,假设地震危险性分析提供的水平峰值加速度的所在位置,选用攀枝花—会理地震波,通过基线校正和高频滤波作为实际地震动输入,利用FLAC3D软件对某水电站大型地下洞室群进行了地震水平加速度传播特性的研究。数值分析结果表明,厂房周围监测点水平加速度时程和输入地震水平加速度时程相似,但存在0.08～0.12s的滞后时差,输入地震动水平峰值加速度向上传播时具有放大效应,在洞室群附近放大两倍左右。所得结果对大型地下洞室群地震动传播特征问题研究具有一定的参考意义。
The depth attenuation effect in gorge bedrock site was considered,and the location of horizontal peak acceleration provided in the seismic hazard analysis report was assumed.One of the Panzhihua-Huili earthquake records,by baseline correction and high frequency filtering,was selected as the actual seismic input for numerical simulation on horizontal seismic acceleration propagation of large underground cavern group in some hydraulic power station by software FLAC3D.The results show that the time history of horizontal accelerations around caverns are similar to that of input seismic acceleratioo but legs behind about 0.08~0.12s with the input record.The input peak acceleration can be amplified during vertical propagation,with about twice amplification around caverns.This research results can give a reference to the study on the horizontal seismic propagation of large-scale underground cavern group.
The depth attenuation effect in gorge bedrock site was considered,and the location of horizontal peak acceleration provided in the seismic hazard analysis report was assumed.One of the Panzhihua-Huili earthquake records,by baseline correction and high frequency filtering,was selected as the actual seismic input for numerical simulation on horizontal seismic acceleration propagation of large underground cavern group in some hydraulic power station by software FLAC3D.The results show that the time history of horizontal accelerations around caverns are similar to that of input seismic acceleratioo but legs behind about 0.08~0.12s with the input record.The input peak acceleration can be amplified during vertical propagation,with about twice amplification around caverns.This research results can give a reference to the study on the horizontal seismic propagation of large-scale underground cavern group.
引文
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[5]宋林,孟昭博,吴敏哲,等.双层岛式地铁车站结构地震反应分析[J].世界地震工程,2010,26(2):187-192.Song Lin,Meng Bozhao,Wu Minzhe,et al.Dynamic response analysis of a two layer subway station structure under earthquake[J].World Earth-quake Engineering,2010,26(2):187-192.
[6]边金,陶连金,王文沛,等.强震下地铁车站结构动力响应特性[J].世界地震工程,2010,26(2):114-118.Bian Jin,Tao Lianjin,Wang Wenpei,et al.Dynamic response characteristics of underground subway station during the strong earthquake[J].World Earthquake Engineering,2010,26(2):114-118.
[7]李海波,马行东,李俊如,等.地震荷载作用下地下岩体洞室位移特征的影响因素分析[J].岩土工程学报,2006,28(3):358～362.LI Haibo,MA Xingdong,LI Junru,et al.Study on influence factors of rock cavern displacement under earthquake[J].Chinese Journal ofGeotechnical Engineering,2006,28(3):358-362.
[8]王如宾,徐卫亚,石崇,等.高地震烈度区岩体地下洞室动力响应分析[J].岩石力学与工程学报,2009,28(3):568-575.WANG Rubin,XU Weiya,SHI Chong,et al.Dynamic response analysis of rock underground caverns in highly seismic region[J].Chinese Jour-nal of Rock Mechanics and Engineering,2009,28(3):568-575.
[9]李小军,卢滔.水电站地下厂房洞室群地震反应显式有限元分析[J].水力发电学报,2009,28(5):1877-1882.LI Xiaojun,LU Tao.Explicit finite element analysis of earthquake response for underground caverns of hydropower stations[J].Journal of Hydroe-lectric Engineering,2009,28(5):1877-1882.
[10]胡聿贤.地震工程学[M].北京:地震出版社,2006.HU Yuxian.Earthquake engineering[M].Beijing:Earthquake Press,2006.
[11]张玉敏,盛谦,朱泽奇,等.深度衰减效应对大型地下洞室群强震响应的影响分析[J].岩土力学,2010,31(10):3197-3202.ZHANG Yumin,SHENG Qian,ZHU Zeqi,et al.Influence of depth attenuation on seismic response of large underground cavern group[J].Rockand Soil Mechanics,2010,31(10):3197-3202.
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