地下厂房洞室群动力反应时程分析
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摘要
采用动力时程分析法,对杨房沟水电站地下厂房洞室群地震反应进行了三维非线性数值模拟,分析了洞周围岩的加速度、位移时程变化及应力分布特征.计算结果表明,在地震荷载作用下,洞室高边墙对加速度有一定放大效应;洞周围岩地震位移波形与输入地震波形一致,围岩各质点间的相对变形及围岩永久变形均较小;围岩应力分布较为合理,最大主应力及最小主应力幅值较小,地下洞室群在设计地震荷载作用下抗震稳定性较好.
The dynamic response of underground caverns under seismic load is analyzed using time-history analysis method and 3D nonlinear dynamic model.The time-history of acceleration,displacement and distribution of stress field are discussed.The results show that the free surfaces and high sidewall of powerhouse have amplification effect on acceleration.The wave form of earthquake displacement response of surrounding rock is consistent with that input earthquake;and the permanent displacement and relative displacement due to earthquake are small.The stress of surrounding rock is relatively well distributed under seismic loading;and surrounding rock has low maximum principal stress and minor principal stress.Underground caverns are stable under design earthquake load.
The dynamic response of underground caverns under seismic load is analyzed using time-history analysis method and 3D nonlinear dynamic model.The time-history of acceleration,displacement and distribution of stress field are discussed.The results show that the free surfaces and high sidewall of powerhouse have amplification effect on acceleration.The wave form of earthquake displacement response of surrounding rock is consistent with that input earthquake;and the permanent displacement and relative displacement due to earthquake are small.The stress of surrounding rock is relatively well distributed under seismic loading;and surrounding rock has low maximum principal stress and minor principal stress.Underground caverns are stable under design earthquake load.
引文
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[2]刘如山,胡少卿,石宏彬.地下结构抗震计算中拟静力法的地震荷载施加方法研究[J].岩土工程学报,2007,29(2),237-242.
[3]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.
[4]石崇.含弱面岩体的地震动力响应分析及工程应用[D].南京:河海大学,2008.
[5]左双英,肖明.映秀湾水电站大型地下洞室群三维非线性损伤地震响应数值分析[J].水力发电学报,2009,28(5):127-133.
[6]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.
[7]Itasca Consulting Group,Inc.FLAC3D(fast Lagrangiananalysis of continua in 3dimensions)user manual(Ver.3.00)[R].Minneapolis,USA:Itasca Consulting Group,Inc.,2005.
[8]张玉敏,盛谦,朱泽奇,等.地震作用下大型地下洞室群位移特征的若干影响因素分析[J].岩石力学与工程学报,2010,31(11):3525-3530.
[9]Lysmer J,Kuhlemeyer R L.Finite Dynamic Model forInfinite Media[J].Journal of Engineering Mechanics,1969,95(EM4):859-877.
[10]陈建云,胡志强,林皋.超大型地下洞室群的三维地震响应分析[J].岩土工程学报,2001,23(4):494-498.
[11]林皋,梁青槐.地下结构的抗震设计[J].土木工程学报,1996,29(1):17-25.
[12]林皋.地下结构抗震分析综述(上)[J].世界地震工程,1990(2):1-10.
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