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关于岩石强度对预裂爆破的影响,目前尚有不同看法。有些认为岩石强度对预裂爆破效果的影响不大,不是重要因素;有些则认为岩石强度应是预裂爆破设计的主要依据之一。作者曾对几种岩石作了小试件的预裂(或劈裂)爆破试验。结果表明:其它条件一定时,取得预裂爆破成功的最大炮孔距离与岩石强度有密切的关系。而且得出了预裂爆破的炮孔间距与岩石抗拉强度比与抗压强度有着更好的相关性的结论。
There are different opinions on the influence of rock strength on presplitting blasting. Some believe that the rock strength has little effect on the presplit blasting effect, not an important factor; while others think that the rock strength should be the primary basis for presplitting blasting design. The author has conducted a small pre-cracking (or splitting) blasting test on several rocks. The results show that when the other conditions are constant, the maximum hole distance for obtaining pre-splitting blasting success is closely related to rock strength. The conclusion is drawn that the relationship between blasthole spacing and rock tensile strength ratio and compressive strength has a better correlation.