管桩作为一种常用的桩基础,在实际工程中被广泛应用,其动力响应分析具有重要研究价值。基于弹性动力学原理和黏弹性饱和土模型,考虑了土骨架的非流动黏性和管桩的横向惯性效应,研究了分数阶黏弹性饱和土中大直径管桩在竖向动载荷作用下...管桩作为一种常用的桩基础,在实际工程中被广泛应用,其动力响应分析具有重要研究价值。基于弹性动力学原理和黏弹性饱和土模型,考虑了土骨架的非流动黏性和管桩的横向惯性效应,研究了分数阶黏弹性饱和土中大直径管桩在竖向动载荷作用下的动力特性。首先,基于Biot动力固结理论和分数阶标准线性固体(fractional-order standard linear solid,简称FSLS)模型,建立了分数阶黏弹性饱和土在柱坐标系下的波动方程。其次,基于Rayleigh-Love杆模型并考虑管桩的横向惯性效应,推导了管桩的桩顶动阻抗解析解答。最后,通过算例分析,研究了分数阶模型参数、管桩横向惯性效应、桩长和土体渗透力对管桩桩顶动阻抗的影响规律。结果表明:饱和土体骨架FSLS模型参数中分数阶数和应变松弛时间的增大以及应力松弛时间的减小都会增大桩顶动阻抗;管桩的横向惯性效应在高频区段对降低桩顶动阻抗尤为明显;缩小管桩外半径和扩大其内半径以及增加桩长,降低土体渗透性均有助于提高桩顶动阻抗。展开更多
We assembled approximately 328 seismic records. The data set was from 4 digitally recording long-period and broadband stations of CDSN. We carried out the inversion based on the partitioned waveform inversion (PWI). I...We assembled approximately 328 seismic records. The data set was from 4 digitally recording long-period and broadband stations of CDSN. We carried out the inversion based on the partitioned waveform inversion (PWI). It partitions the large-scale optimization problem into a number of independent small-scale problems. We adopted surface waveform inversion with an equal block (2((2() discretization in order to acquire the images of shear velocity structure at different depths (from surface to 430 km) in the crust and upper-mantle. The resolution of all these anomalies has been established with (check-board( resolution tests. These results show significant difference in velocity, lithosphere and asthenosphere structure between South China Sea and its adjacent regions.展开更多
文摘管桩作为一种常用的桩基础,在实际工程中被广泛应用,其动力响应分析具有重要研究价值。基于弹性动力学原理和黏弹性饱和土模型,考虑了土骨架的非流动黏性和管桩的横向惯性效应,研究了分数阶黏弹性饱和土中大直径管桩在竖向动载荷作用下的动力特性。首先,基于Biot动力固结理论和分数阶标准线性固体(fractional-order standard linear solid,简称FSLS)模型,建立了分数阶黏弹性饱和土在柱坐标系下的波动方程。其次,基于Rayleigh-Love杆模型并考虑管桩的横向惯性效应,推导了管桩的桩顶动阻抗解析解答。最后,通过算例分析,研究了分数阶模型参数、管桩横向惯性效应、桩长和土体渗透力对管桩桩顶动阻抗的影响规律。结果表明:饱和土体骨架FSLS模型参数中分数阶数和应变松弛时间的增大以及应力松弛时间的减小都会增大桩顶动阻抗;管桩的横向惯性效应在高频区段对降低桩顶动阻抗尤为明显;缩小管桩外半径和扩大其内半径以及增加桩长,降低土体渗透性均有助于提高桩顶动阻抗。
基金State Natural Scientific Foundation (49734150) and National High Performance Computation Foundation.
文摘We assembled approximately 328 seismic records. The data set was from 4 digitally recording long-period and broadband stations of CDSN. We carried out the inversion based on the partitioned waveform inversion (PWI). It partitions the large-scale optimization problem into a number of independent small-scale problems. We adopted surface waveform inversion with an equal block (2((2() discretization in order to acquire the images of shear velocity structure at different depths (from surface to 430 km) in the crust and upper-mantle. The resolution of all these anomalies has been established with (check-board( resolution tests. These results show significant difference in velocity, lithosphere and asthenosphere structure between South China Sea and its adjacent regions.
