弓长岭露天矿顺倾断层物探勘测与分析

Analysis andgeophysical exploration on consequent fault in Gongchangling Open Pit Mine

弓长岭露天铁矿北帮边坡出现了沿顺倾断层F100大范围整体下滑的迹象,滑坡壁高达约10m。F100断层面平直,断层带内有少量断层泥,对边坡的变形破坏起主要的控制作用。研究F100的深部产状变化是稳定性分析的关键,为此进行了三极电测深勘测,物探结果表明F100断层产状与地表所见产状相近,向下最大延伸约200m,深部倾角变化不大。通过稳定性分析确定了削坡减载设计方案,境界内削坡量为174.1万m3,境界外削坡量为318.4万m3,总计492.5万m3。

There is a sign of a large scope integral landslide along the consequent fault F100 in the north slope of Gongchangling Open Pit Mine. The landslide wall is about 10 m height. The fault F100 surface is straight and there is a small amount of fault gouge in the Fault-Rupture Zone, which is a main controlling factor on the slope deforma tion and failure. To survey deep-seated occurrence of Fault F100 is a key problem to the stability analysis. Therefore Tri-electrodes sounding for fault survey have been carried out. The results show that deep-seated and upper occur fence of Fault F100 is similar. The biggest elongated depth is about 200 m. The deep-seated dip angle of fault chan- ges little. According to the results of analysis and the characteristic of landslide, it is suggested that such measures as cutting slope and reducing load should be used on the landslide. The engineering quantity of cutting slope design is 1. 741 × 106 m^3 inside the mining boundary, 3. 184 × 10^6 ms outside and 4. 925 × 106 m^3 in total.