混凝土单桩对瑞利波的阻隔机理试验研究
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河北省青年拔尖人才计划项目(BJ2016018);2018年张家口市科技局科技计划项目(1811009BG13);河北建筑工程学院研究生创新基金(XB201924)


Experimental Study on the Barrier Mechanism of Concrete Single Pile to Rayleigh Wave
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    摘要:

    通过室外试验的方法绘制相对加速度的二维等值线图,并依据桩周土体的振动情况进行区域划分,进一步研究单桩几何尺寸变化时其周围土体振动区域的变化情况。结果表明:单桩桩前、桩两侧存在振动加强区,桩前的振动加强现象更强,以桩角处尤为明显;当桩长与波长的比值在0.109~0.840时,隔振区、反射区的面积增长幅度较大,而绕射区的面积则迅速减小,当比值在0.840~0.962时,隔振区、反射区以及绕射区的面积变化很小,数据趋于缓和;桩径与波长的比值对桩周振动区域的影响较大,随着比值在0.013~0.163之间增大,隔振区与反射区的面积分别增加了0.249 m2、0.129 m2,增长的速率均较快,而绕射区的面积以较快的速率降低了0.088 m2;振源距与波长的比值对隔振区与反射区的面积影响较大,当比值在0.163~0.961时,隔振区与反射区的面积急速下降,当比值在0.961~1.068时,变化趋势趋于缓和,对于绕射区面积,随着比值的增加,绕射区的面积仅仅增加了0.037 m2

    Abstract:

    In this paper, a two-dimensional contour plot of relative acceleration is drawn through outdoor experiments, and the area division is carried out according to the vibration of soil around pile. Furthermore, the changes of soil vibration area around single pile with different geometric size are analyzed. The results show that there are vibration strengthening areas in front of and on both sides of the single pile, and the vibration strengthening phenomenon in front of the pile is stronger, especially at the pile corner. With the ratio of pile length to wavelength in a range of 0.109-0.840, the areas of vibration isolation zone and reflection zone increase greatly, while the area of diffraction zone decreases rapidly; when the ratio increases from 0.840 to 0.962, the areas of vibration isolation zone, reflection zone, and diffraction zone change little. The ratio of pile diameter to wavelength has a great influence on the vibration area around the pile. As the ratio increases from 0.013 to 0.163, the areas of vibration isolation zone and reflection zone increase by 0.249 m2 and 0.129 m2, respectively, while the area of diffraction zone decreases by 0.088 m2. The ratio of source distance to wavelength has a great influence on the area of vibration isolation zone and reflection zone. When the ratio is in the range of 0.163-0.961, the areas of vibration isolation zone and reflection zone decrease rapidly; when the ratio is in the range of 0.961-1.068, the change trend tends to be gentle, and the area of diffraction area only increases by 0.037 m2.

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赵大威,刘航,刘晶磊,张楠.混凝土单桩对瑞利波的阻隔机理试验研究[J].地震工程学报,2021,43(3):693-703. ZHAO Dawei, LIU Hang, LIU Jinglei, ZHANG Nan. Experimental Study on the Barrier Mechanism of Concrete Single Pile to Rayleigh Wave[J]. China Earthquake Engineering Journal,2021,43(3):693-703.

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  • 收稿日期:2020-04-07
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  • 在线发布日期: 2021-06-05