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TI介质地震波场数值模拟边界条件处理 被引量:11
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作者 李景叶 陈小宏 《西安石油大学学报(自然科学版)》 CAS 2006年第4期20-23,共4页
地震波场数值模拟研究中,边界条件处理非常重要,它直接影响模拟地震数据的精度.针对TI(Transversely Isotropic)介质一阶速度—应力弹性波动方程组,利用时间域分裂法给出了PML(Perfectly matched layer,完全匹配层)吸收边界条件,其基本... 地震波场数值模拟研究中,边界条件处理非常重要,它直接影响模拟地震数据的精度.针对TI(Transversely Isotropic)介质一阶速度—应力弹性波动方程组,利用时间域分裂法给出了PML(Perfectly matched layer,完全匹配层)吸收边界条件,其基本思想是在所研究的区域外引入吸收层,地震波从有效计算区域传播到吸收层时不发生任何反射,且在吸收层内按传播距离呈指数衰减,不发生反射.利用交错网格高阶差分技术对PML吸收边界条件求解,对比不同边界条件数值模拟结果表明,PML吸收边界条件较应用广泛的Clayton吸收边界有更好的吸收效果,能更好地满足地震数值模拟的需要. 展开更多
关键词 完全匹配层 吸收边界条件 TI介质 地震波动场 数值模拟 一阶波动方程
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Physical random function model of ground motions for engineering purposes 被引量:29
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作者 WANG Ding LI Jie 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第1期175-182,共8页
A physical random function model of ground motions for engineering purposes is presented with verification of sample level. Firstly,we derive the Fourier spectral transfer form of the solution to the definition proble... A physical random function model of ground motions for engineering purposes is presented with verification of sample level. Firstly,we derive the Fourier spectral transfer form of the solution to the definition problem,which describes the one-dimensional seismic wave field. Then based on the special models of the source,path and local site,the physical random function model of ground motions is obtained whose physical parameters are random variables. The superposition method of narrow-band harmonic wave groups is improved to synthesize ground motion samples. Finally,an application of this model to simulate ground motion records in 1995 Kobe earthquake is described. The resulting accelerograms have the frequencydomain and non-stationary characteristics that are in full agreement with the realistic ground motion records. 展开更多
关键词 ground motion physical model random function narrow-band harmonic waves group non-stationarity
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