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Slope stabilizatio at El Cerrejon coal mine, Colombia, South America

机译:南美洲哥伦比亚哥伦比亚埃尔塞雷洪煤矿的边坡稳定

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The expanded west pit of the 15 Mta (13.6 stpy) El Cerrejon mine will eventually reach a maximum depth of 270 m (890 ft). -Slope-sta-bility evaluations indicated that this depth, combined with structural complexities, would create a serious risk of footwall instability. Stabilization calls for anchoring the footwall by the installation of 9- to 33-rn- (30- to 108-ft-) long multistrand steel cable bolts. For each of the 15-m- (50-ft-) high mining benches, a row of bolts is installed with variable horizontal spacing, depending on the dip magnitude. Cable bolting is now standard operating practice, and an estimated 11,800 bolts will be installed during the life of the mine Results to date have been satisfac-tory in terms of the stability condition of the bolted slopes.
机译:15 Mta(13.6 stpy)El Cerrejon矿的扩大的西坑最终将达到最大深度270 m(890 ft)。 -斜坡稳定性评估表明,该深度加上结构复杂性,将产生严重的下盘失稳风险。稳定要求通过安装9到33 rn-(30到108 ft-英尺)长的多股钢缆螺栓来固定底壁。对于每个15米(50英尺)高的采矿台,根据倾角的大小,安装一排水平间距可变的螺栓。如今,电缆锚固已成为标准的操作惯例,在矿山的使用寿命期间,估计将安装11800根螺栓。到目前为止,就锚固边坡的稳定性而言,结果令人满意。

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