减震沟对塌落振动影响的试验研究

Experimental Study on the Collapse Vibration Affected by Two Damping Ditches

利用混凝土块的重复倾倒来模拟建(构)筑物爆破拆除的倾倒过程。在倒塌方向开挖减震沟,通过改变减震沟数量,对采集的数据进行分析,得出减震沟数量不同时对塌落振动信号地影响程度。对比分析可知:与无沟相比,一条减震沟时,测点3的平均峰值振速下降了7.22%;两条减震沟时,其下降了21.6%,其他测点在两条减震沟时峰值振速也比一条减震沟时的峰值振速下降得多。综合分析可知:两条减震沟比一条减震沟时的减震效果更明显。通过Hilbert-Huang变换方法(HHT法)分析可知:当有两条减震沟时,分析4次试验中的一组数据得到测点1、2、3的能量幅值与其相对应的峰值振速变化规律相符。进一步说明峰值振速与最大能量幅值之间的对应关系,证明两条减震沟时减震效果较好。

The process of blasting demolition of building（ structure） by repeating dumping of concrete block is imitated. In the direction of the collapsed excavation damping ditch,by changing the number of the damping ditch,on data collection analysis,we draw the damping ditch number to the collapse vibration signal extent. The comparison analysis shows that the average maximum peak vibration velocity of a shock absorber,compared with no channel,is decreased by 7. 22% when the peak value of the peak is 3,and two of the damping groove is decreased by 21. 6%. Other measurement pointed in two shock ditch of maximum peak vibration velocity is also compared to a shock absorber maximum peak vibration velocity which is much lower. The comprehensive analysis shows that the two damping groove is more obvious than a damping effect of damping ditch. Through HHT analysis,we can know there are two vibration damping ditches,the energy of 1,2 and 3 of the data is obtained from the four tests. The corresponding relationship between the maximum peak speed and the maximum energy amplitude is later explained.The results show that the damping effect of the two is better. The results of the study to reduce the production practice of blasting hazard collapse vibration will provide guidance.