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  周洋,阿拉塔,郭迅,孙丽.强夯振动衰减规律及其对建筑安全性的影响[J].震灾防御技术,2018,(4):860-868, DOI:10.11899/zzfy20180413.

强夯振动衰减规律及其对建筑安全性的影响
摘要:    依托工程实例,对粉土场地强夯加固振动衰减规律及其对建筑物的影响开展试验研究,探讨了振动加速度与强夯能量、传播距离之间的关系,建立了2种能级夯击振动加速度衰减公式;提出了建筑物最小安全距离的确定方法及减轻强夯振动影响的工程措施。结果表明:强夯振动加速度峰值近似按指数函数衰减,且强夯能量越大,振动衰减速度越快;夯击振动卓越频率为8—10Hz,振源距对振动卓越频率影响不大;振源距达到50m时,2种能级的强夯振动对建筑物影响均可忽略不计。
作者单位
周洋 防灾科技学院, 河北三河 065201 
阿拉塔 云南省地震局, 昆明 650224 
郭迅 防灾科技学院, 河北三河 065201 
孙丽 防灾科技学院, 河北三河 065201 
关  键  词:强夯振动  衰减规律  最小安全距离  振动测试  粉土场地
DOI:10.11899/zzfy20180413
基金项目:中国地震局教师基金(20150108),中国地震局地震科技星火计划(XH18073Y),国家自然科学基金(51478117)
收稿日期:2018-04-03
作者简介:周洋,男,生于1987年。讲师。主要从事结构抗震研究。E-mail:zhouyang@cidp.edu.cn
通讯作者:郭迅,男,生于1967年。教授。主要从事结构抗震研究。E-mail:guoxun@iem.ac.cn
Investigation on Vibration Attenuation Laws with Dynamic Compaction Vibration and the Effect on Building Safety
Abstract:      Based on the vibration test during the dynamic compaction, the relationships of the vibration acceleration with the energy of dynamic compaction and the transmission distance are analyzed. The vibration acceleration attenuation formulas are established which are suitable for silt foundation. The method for calculation of minimum permitted distance and the measure to minimize vibration damage are also proposed in this paper. The results indicate that the attenuation of vibration acceleration relates to distance, and the attenuation rate is directly proportional to the dynamic compaction energy. The predominant frequency of vibration is around 8 to 10Hz. The effect of transmission distance for vibration frequency is not obviously. When the distance exceed 50m, the influence on buildings can be ignored.
Keywords:  Dynamic compaction  Vibration attenuation rule  Minimum safe distance  Vibration test  Silt foundation
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