硐室爆破对边坡坡面震动的数值分析

Numerical Analysis of Chamber Blasting on Slope Vibration

以湖北巴东某铁矿隧道硐室爆破施工为依托,建立硐室爆破震动模型,采用有限差分软件FLAC3D对硐室爆破引起的临近边坡坡面震动进行计算,得到硐室爆破下边坡质点震动规律,并对硐室爆破下边坡稳定性进行定性和定量评价。结果表明:质点振动峰值震速与爆心距相关,但出现高程效应;坡面和坡顶水平面质点震动峰值出现较明显方向差异;通过与现行规范进行对比以及拟静力法,能够对硐室爆破下边坡的稳定性进行有效评价。

Based on blasting construction of an iron tunnel in Badong,Hubei Province,a model of chamber blasting vibration was established.The finite difference software FLAC3D was used to calculate the vibration of slope near the slope caused by chamber blasting.Qualitative and quantitative evaluation of slope stability were done under chamber blasting.The results show that the peak vibration velocity of particle is related to the center of the burst,but the elevation effect appears.The obvious difference of the peak direction of the peak vibration occurs at the surface of the slope and the top of the slope.By comparing with the existing codes and quasi-static method,the slope stability can be effectively evaluated.