Finally, the economy, the social effect were used to appraise the pre-splitting blasting with wide pitchofholes.
最后，对使用宽孔距的预裂爆破所产生的经济、社会效应进行了评价。
2
The influence is very faint when the pitchofholes is beyond a critical value, and the stress concentration increases quickly with the decrease of the pitchofholes.
孔洞之间距离超过某一临界值时影响很小，当小于该临界值时随孔洞间距离的减小应力集中急剧增加。
3
By this model, we compare the cooling effectiveness of three methods and analysis cooling characters when reduce the diameter and pitchof the holes at the same scale.