不同装药量单孔爆破振动效应试验研究

在城市地下工程爆破施工中,随着爆破规模的不断扩大和地上地下环境的复杂,对改进爆破工艺、改善爆破效果、降低爆破振动效应提出了越来越高的要求。本文通过改变不同装药量0.7～2.0g,对存在预裂缝条件下进行爆破振动测试,重点研究了单孔爆破振动效应。研究结果表明:装药量的变化将直接影响到振动峰值速度的大小,不同装药量时,峰值速度随装药量的增加而变大,且药量达到一定值时,峰值速度以非线性函数式急剧增大;同时,随装药量的增加主频率也在降低,与速度变化率相比之下,主频率的变化较缓和些。

Experimental study on single hole blasting vibration effect of differect explosive charge

With the expansion of the bursting scale and further complex of environment,higher and higher requirement is needed on improvement of the blasting process,blasting effect and reducing vibration effect in underground blasting construction of the city.The effect of single-hole blast vibration is the main research target in the essay by changing explosive charge of 0.7~2.0 g under blasting vibration test of pre-splitting crack condition.The research results show that changing charge will directly affect the size of peak velocity of vibration,and under different explosive charge,the peak velocity will increase with the larger amount of explosive charge,and when explosive charge reaches a certain value,the peak velocity will sharply increase with the non-linear function;Meanwhile,compared with rate of speed change,the main frequency will also be reduced slowly with the larger amount of explosive charge.