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在我国矿山井巷掘进中,长期以来一般都采用浅眼循环斜眼掏槽的自由爆破法。使用该法普遍存在着爆破无正形,超挖免不了,残孔数不清,进尺必然少的缺点,人们管其叫“粗、浅、慢”。技术上的主要原因是:炮眼布置乱,掏槽不可靠,周边未控制,装药量太高。为了改变这种落后状况,适应我国社会主义采掘工业迅速发展的需要,近二十多年来,国内很多单位曾做了大量的研究和试验,企图寻求一些新的爆破方法。在中心掏槽上,为了克服斜眼掏槽深度浅、角度不好掌握、打眼互相干扰、不易实行多机同时
In our mine shaft tunneling, for a long time, the shallow blast-free blasting method has been used for a long time. The use of the law there is widespread non-positive blasting, over-excavation inevitably, the residual countless number of wells, the inevitable shortcoming of the shortcomings, people call it “rough, shallow, slow.” The main technical reasons are: disarrangement of blasthole, undercutting is not reliable, the surrounding uncontrolled, the charge is too high. In order to change this kind of backwardness and adapt to the rapid development of China's socialist extractive industries, many domestic units have done a great deal of research and experimentation in the past 20 years and are trying to find some new methods of blasting. Cut in the center, in order to overcome the shallow depth of shallow hatch, bad grasp angle, eye-catching interfere with each other, not easy to implement multiple machines at the same time