结合隆芯1#数码电子雷管,针对矿山边坡微差爆破开挖问题提出了一种试验研究方法,采用MATLAB7.0对边坡不同高程振动速度信号进行数值分析,研究得到的结果与高程差因素相比,微差爆破振动信号波形形状的改变对延期时间差异更为敏感。微差爆破振动信号总能量不仅是速度的表征,地震波传播介质起天然滤波器作用,其对高频信号削弱较低频更显著,且随着测点高程的增加,信号能量向低频集中,微差爆破延期时间存在最优值,选取最优延期时间应同时考虑测点(被保护物)距爆区距离(高程)这一因素,试验条件下,岩质边坡微差爆破孔间最优延期时间为15ms。
Surface modification was made of barite using sodium stearate and sodium oleate to change its surface wettahility. The resuhs showed that with variance in angle of contact and surface energy, the surface of modified barite was converted from hydro- philicity to hydrophobicity and the degree of hydrophobieity for barite could he controlled by changing the dosage of modifier. The tests also indicated that when the dosage of modifier was 1%, barite displayed the best dispersity in kerosene.