露天爆破对主运输平硐振动影响的模拟分析

Simulative Analysis of the Effect of Open-pit Blasting Vibration on the Main Haulage Tunnel

目前 ,爆破动载荷模拟分析软件在国内外尚未见报道。南芬露天铁矿运输主平硐在生产中要经受长期大爆破振动的考验 ,需要进行长期爆破对平硐振动影响的评价 ,为此 ,应用突加载荷法来模拟爆破振动响应 ,模拟中采用位移等效原则来确定突加载荷的大小、作用时间和作用范围 ,通过大型岩体力学有限元分析软件FLAC计算 ,以进行岩体内的动态应力场的分析和巷道围岩稳定性的研究。工程实际数据检验 。

Simulative analysis software of the dynamic load of blasting hasn't been seen reported both in and outside China. The main haulage tunnel in Nanfen Open pit Mine is subject to the vibration of great blasting in a long term, thereby leading to the need of the evaluation of the vibration effect of long term blasting on the tunnel. For this, sudden applied load method was used to simulate the blasting vibration response and equivalent displacement method adopted in the simulation to determine the amount and the action time and scope of the load. Based on the calculation through FLAC, a finite element analysis software of large rockmass mechanics, analysis of the dynamic stress field in rockmass and study on the stability of tunnel wall rock were made. This method was proved to be correct by the testing of practical data of engineering.