| 双排隔振屏障对振动波的阻隔作用及动力响应分析 |
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| 引用本文： | 刘晶磊,,,张业荣,,,张冲冲,,,周玮浩,,.双排隔振屏障对振动波的阻隔作用及动力响应分析[J].世界地震工程,2022,38(3):162-170. |
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| 作者姓名： | 刘晶磊 张业荣 张冲冲 周玮浩 |
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| 作者单位： | 1. 河北省土木工程诊断、改造与抗灾重点实验室, 河北 张家口 075000;2. 河北省寒冷地区交通基础设施工程技术创新中心, 河北 张家口 075000;3. 河北建筑工程学院 土木工程学院, 河北 张家口 075000 |
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| 摘 要： | 本文采用模拟试验的方法，对分层土地基中双排隔振屏障对振动波的动力响应进行了探讨，并研究了桩长与土层分界面位置关系、激振频率对其隔振效果的影响作用，得出结论:（1）屏障前振动强度远大于屏障后振动强度，并随着振源距、激振频率、桩长的增加而下降，且屏障前出现明显振动增强现象，在激振频率80 Hz时产生振动峰值，振动强度在高频时基本稳定，继续增加激振频率，振动强度并不会发生明显变化。（2）屏障后中线左右2倍桩长范围内为整个隔振区域的薄弱区，其他区域则由包络线围成一个封闭有效隔振区。（3）屏障对中频和高频有更好的隔振效果，且桩长越大有效隔振面积越大，当桩长超过土层分界面时，有效隔振面积可达到53.25%～69.78%，但此时有效隔振面积增幅由原来的14.29%下降到11.64%，增幅降低了约3%。（4）未设屏障区振动强度较小，随激振频率小范围内浮动，在激振频率为30 Hz和80 Hz时取得振动峰值，且随着屏障布置方向减小，即靠近屏障一侧振动强度较强，远离屏障一侧振动强度较弱。
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| 关 键 词： | 双排桩 分层土地基 动力响应 隔振效果 |
Analysis of the blocking effect and dynamic response of double-row vibration isolation barriers on vibration waves |
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| LIU Jinglei,,' target="_blank" rel="external">,ZHANG Yerong,,' target="_blank" rel="external">,ZHANG Chongchong,,' target="_blank" rel="external">,ZHOU Weihao,,' target="_blank" rel="external">.Analysis of the blocking effect and dynamic response of double-row vibration isolation barriers on vibration waves[J].World Information On Earthquake Engineering,2022,38(3):162-170. |
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| Authors: | LIU Jinglei " target="_blank">' target="_blank" rel="external"> ZHANG Yerong " target="_blank">' target="_blank" rel="external"> ZHANG Chongchong " target="_blank">' target="_blank" rel="external"> ZHOU Weihao " target="_blank">' target="_blank" rel="external"> |
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| Affiliation: | 1. Hebei Key Laboratory of Civil Engineering Diagnosis, Reconstruction and Disaster Resilience, Zhangjiakou 075000, China;2. Technology Innovation Center for Transportation Infrastructure Engineering in Cold Regions of Hebei Province, Zhangjiakou 075000, China;3. School of Civil Engineering, Hebei Institute of Civil Engineering and Architecture, Zhangjiakou 075000, China |
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| Abstract: | In this paper,the method of simulation test is used to discuss the dynamic response of double-row vibration isolation barriers in layered soil foundation to vibration waves. influence,and the following conclusions are drawn:1)The vibration intensity before the barrier is much greater than the vibration intensity behind the barrier and decreases with the increase of the vibration source distance,excitation frequency,and pile length,and there is a significant increase in vibration in front of the barrier. The vibration peak is generated at the excitation frequency of 80 Hz,and the vibration intensity is basically stable at high frequencies. If the excitation frequency continues to be increased,the vibration intensity will not change significantly. 2)The range of 2 times the pile length from the left and right of the center line behind the barrier is the weak area of the entire vibration isolation area,and the other areas are enclosed by an envelope line to form a closed effective vibration isolation area. 3)The barrier has a better vibration isolation effect for medium and high frequencies,and the larger the pile length,the larger the effective vibration isolation area. When the pile length exceeds the soil interface,the effective vibration isolation area can reach 53.25%~69.78%. But at this time,the effective vibration isolation area increased from 14.29% to 11.64%, and the increase decreased by about 3%. 4)The vibration intensity of the area without a barrier is small,and it floats within a small range with the excitation frequency. The vibration peak is obtained when the excitation frequency is 30Hz and 80Hz,and as the barrier arrangement direction decreases,the vibration intensity is greater on the side close to the barrier. Strong,weaker vibration on the side away from the barrier. |
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| Keywords: | double-row piles layered soil foundation dynamic response vibration isolation effect |
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