水电站地下洞室群非线性地震反应数值仿真
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摘要
为了解水电站地下厂房洞室群非线性地震反应特点,结合某实际工程采用拉格朗日显式差分法进行数值仿真,考虑了初始地应力、分步开挖与柔性支护以及岩体材料弹塑性等影响,考察了主厂房洞室围岩的地震位移、速度、加速度等时、频域反应特征,并对围岩稳定性进行了判别。结果表明,地下岩石洞室围岩的地震反应属低频震动;地震波竖向传播时,洞室围岩壁各点的位移(或速度、加速度)反应波形基本相似,且几乎同步;地震作用不利于洞室的稳定。
To understand the nonlinear dynamic response characteristics of underground caverns in hydropower projects,the Lagrangian explicit difference method is used to simulate the seismic responses of a hydropower project,in which,the initial stress,step excavations,flexible supporting and rock elastoplastic are taken into account.The characteristics in time and frequency domain of seismic response,such as displacement,velocity and acceleration,are presented,and the surrounding rock stability is also checked.The results show that:(a)the seismic responses of surrounding rock belong to vibrations with low frequency;(b)the displacement(or velocity,acceleration) of a point in side wall of the cavern are nearly close in the time-waveform with no phase difference;and(c)the earthquake endangers the stability of caverns.
To understand the nonlinear dynamic response characteristics of underground caverns in hydropower projects,the Lagrangian explicit difference method is used to simulate the seismic responses of a hydropower project,in which,the initial stress,step excavations,flexible supporting and rock elastoplastic are taken into account.The characteristics in time and frequency domain of seismic response,such as displacement,velocity and acceleration,are presented,and the surrounding rock stability is also checked.The results show that:(a)the seismic responses of surrounding rock belong to vibrations with low frequency;(b)the displacement(or velocity,acceleration) of a point in side wall of the cavern are nearly close in the time-waveform with no phase difference;and(c)the earthquake endangers the stability of caverns.
引文
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[8]崔臻,盛谦,刘加进,等.基于小波包的地下洞室群地震响应及其频谱特性研究[J].岩土力学,2010,12(31):3901-3906.
[9]张运良,马艳晶,韩涛.大型水电站地下洞室群三维地震反应时域分析[J].水力发电,2010,36(5):27-30.
[10]郑颖人,肖强,叶海林,等.地震隧洞稳定性分析探讨[J].岩石力学与工程学报,2010,29(6):1081-1088.
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[2]金峰,王光纶,贾伟伟.离散元-边界元动力耦合模型在地下结构动力分析中的应用[J].水利学报,2001(2):26-30.
[3]李海波,马行东,邵蔚,等.地震波参数对地下岩体洞室位移特性的影响分析[J].岩石力学与工程学报,2005,24(A01):4627-4634.
[4]隋斌,朱维申,李晓静.地震荷载作用下大型地下洞室群的动态响应模拟[J].岩土工程学报,2008,30(12):1877-1882.
[5]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):41-46.
[6]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(30):568-575.
[7]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,2009,30(3):721-728.
[8]崔臻,盛谦,刘加进,等.基于小波包的地下洞室群地震响应及其频谱特性研究[J].岩土力学,2010,12(31):3901-3906.
[9]张运良,马艳晶,韩涛.大型水电站地下洞室群三维地震反应时域分析[J].水力发电,2010,36(5):27-30.
[10]郑颖人,肖强,叶海林,等.地震隧洞稳定性分析探讨[J].岩石力学与工程学报,2010,29(6):1081-1088.
[11]张国强.水电站地下厂房洞室群施工数值模拟[D].大连:大连理工大学,2007.
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