水下砂土层非线性动力反应的直接差分法
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摘要
应用多孔介质动力学进行了水下的砂土地层的动力反应分析,水下砂层可以看作是多相介质,孔隙水是可压缩的,土壤采用了非线性本构,考虑了砂土的刚度退化和剪胀性及土水相对运动等因素,并研究了多孔介质波动模拟的边界条件,建立了水体下地层平面动力非线性动力反应的直接差分法,直接求解水体的压力和饱和土层的动孔隙压力,可以进一步分析水下砂土地震液化问题。
Based on K.Terzaghi's soil mechanics model and taken account of soil dynamic nonlinear constitutive relation,soil shear dliatancy,rigidity degradation,hysteresis and water-soil relative motion,multi-phased medium dynamics theory is used to analyze the wave propagation and dynamic response of sand layers under water,and an artificial boundary condition is analyzed to simulate the wave propagation in pore medium. A set of dynamic equations of soil layers under water are established,and the equations are discreted to be used to analyze the earthquake engineering problem of soil under water,a direct differential method is suggested to calculate the water pressure and porewater pressure and to study the sand seismic liquefaction under water.
Based on K.Terzaghi's soil mechanics model and taken account of soil dynamic nonlinear constitutive relation,soil shear dliatancy,rigidity degradation,hysteresis and water-soil relative motion,multi-phased medium dynamics theory is used to analyze the wave propagation and dynamic response of sand layers under water,and an artificial boundary condition is analyzed to simulate the wave propagation in pore medium. A set of dynamic equations of soil layers under water are established,and the equations are discreted to be used to analyze the earthquake engineering problem of soil under water,a direct differential method is suggested to calculate the water pressure and porewater pressure and to study the sand seismic liquefaction under water.
引文
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[5]陈文化.CONE模型与地基动力液化的非线形有效应力分析[J].岩土力学,2003,24(1):40―44.
[6]Chen Wen-hua.Cone model for two surface foundations on layered soil[J].Earthguake Engineering and Engineering Vibration,2006,l5(2):183―187.
[7]陈文化.广州地铁砂土层液化判别[J].土木工程学报,2006,39(3):118―123.
[2]陈文化,孙谋,刘明丽.南京砂的结构特性和地铁地基液化判别[J].岩土力学,2003,10(5):755―758.
[3]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.
[4]陈文化.动力作用下砂土的残余变形和时域连续模型[J].岩土力学,2003,10(6):947―951.
[5]陈文化.CONE模型与地基动力液化的非线形有效应力分析[J].岩土力学,2003,24(1):40―44.
[6]Chen Wen-hua.Cone model for two surface foundations on layered soil[J].Earthguake Engineering and Engineering Vibration,2006,l5(2):183―187.
[7]陈文化.广州地铁砂土层液化判别[J].土木工程学报,2006,39(3):118―123.
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