Rock excavation in quarries is normally carried out by using explosives. The steps in planning of cutting face are based on the appropriate design for angles of cut and the optimum consumption of charge weights. Priority procedures in planning are the stability of bench excavation,vibration evaluation,and the selection for the blast patterns. The methods of analysis are described and compared with field results. From several cases of trial cut angles and changing geometry of blast dimensions,the result of an optimum pattern in a specific quarry,with respect to the acceptable global unit cost is achieved.
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机译:Erratum for 'Reliability Evaluation of Vortex-Induced Vibration for a Long-Span Arch Bridge' by Lingyao Li, Teng Wu, Xuhui He, Jianming Hao, Hanfeng Wang, and Hanyong Xu
机译:maroc plan d'Orientation pour le Developpement Economique et social 1988-1992:plan de Concertation et de participation(摩洛哥:1988-1992经济和社会发展指导计划:咨询和参与计划)