钢混立柱爆破个别飞散物运动特性与水袋防护效果

Motion characteristics of individual blasting flying rock and protective effect of water bag in reinforced concrete column blasting

为了研究钢筋混凝土立柱爆破个别飞散物运动特性与水袋防护效果,探讨了个别飞散物的生成机制与防护手段,其次通过开展大尺寸钢筋混凝土立柱爆破模型试验,分析了高速摄像资料获取的个别飞散物运动特性;再基于AUTODYN数值模拟软件,运用SPH方法分别模拟了直径10 mm个别飞散物以10、15、20 m/s初始速度穿越厚度分别为5、10、15 cm防护水袋的减速效果。研究结果表明:钢筋混凝土构件爆破拆除时,爆破生成个别飞散物粒径以碎块(5 mm≤d≤100 mm)为主;爆破碎块飞离母体的初始速度主要范围为10~20 m/s;水袋厚度从5 cm增加至15 cm时,个别飞散物降速效果可从65%提高至95%左右。研究结果可为拆除爆破个别飞散物防护提供参考和借鉴。

In order to study the motion characteristics of individual blasting flying rock and protective effect of water bag in reinforced concrete column blasting,the formation mechanism and protection means of blasting flying rock were discussed firstly..Secondly,the motion characteristics of blasting flying rock were obtained by analyzing the high-speed camera data through the blasting model test of large-size reinforced concrete column.Then,based on AUTODYN numerical simulation software,the SPH method was used to simulate the deceleration effect of 10 mm diameter blasting flying rock passing through the protective water bag with thickness of 5 cm,10 cm and 15 cm,respectively,at the initial speed of 10 m/s,15 m/s and 20 m/s.The results show that the particle size of blasting flying rock generated by blasting is mainly fragments(5 mm≤d≤100 mm).The initial velocity of blasting fragments flying away from the parent is 10~20 m/s.When the water bag thickness increased from 5 cm to 15 cm,the velocity reduction effect of blasting flying rock increased from 65% to 95%.The research results can provide reference for the protection of blasting flying rock in demolition blasting.