To study the impact of controlled blasting on technical and economic indicators in railway tunnels,this paper starts with the theoretical model of tunnel excavation quota construction and blasting vibration impact area,and establishes a systematic method for determining the maximum charge and quota adjustment parameters.This provides necessary basis for reasonably determining the technical and economic indicators of controlled blasting excavation in railway tunnels during the survey and design stage,The research results show that:1)under different vibration speeds and R values,the maximum charge Q value shows lower parameter sensitivity and responsiveness(slope decreases and growth rate slows down)as the rock mass level increases.In the low R value range(10-50m),the variation amplitude of different rock mass levels under different vibration speed conditions is small,but in the high R value range(50-90m),the variation amplitude of different rock mass levels under different vibration speed conditions is large;2)The"radar map"formed by Level Ⅱ surrounding rock is the envelope map for different levels of surrounding rock,and different working conditions tend to be closer to the inner side of the radar envelope map,that is,the stricter the blasting control requirements,and the greater the increase in technical and economic indicators.
关键词
定额施组/爆破振动影响区/理论模型/技术经济指标
Key words
quota construction organization/zone affected by blasting vibration/theoretical model/technical and economic indicators
维普
万方数据