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我矿属于山坡凹陷露天矿,地处高寒多雪地区。露天矿的永久边坡界线处,大部份为辉长岩、角闪岩。工作平台台阶高度为10米,当工作平台退到永久边坡界线处时,用上下两平台并段的方法来形成20米高的永久高平台即安全平台。永久安全平台宽7米,坡面角60度。以往采用的高台阶并段的方法是:当上平台推进到永久边坡线附近时,预留1～2米厚的保护层,进行人工清捣修整,使其达到设计坡面要求,然后再推进下平台到永久边坡线附近,同样预留1～2米厚保护层,再由人工清捣修整,使其达到设计坡面线。这种“分别推进、分别清捣、分别完成、最终并段”的方法,致使永久边坡的形成很缓
I mine belongs to the hillside depression opencast mine, is located in the alpine snowy area. The open slope of the permanent slope boundaries, mostly gabbro, amphibolite. The working platform has a height of 10 meters. When the working platform is retreated to the boundary of the permanent slope, a 20-meter-long permanent high platform, that is, a safety platform, is formed by using upper and lower platforms and sections. Permanent security platform width of 7 meters, 60 degrees slope angle. In the past, the method of using high steps and sections was to reserve 1 to 2 meters of protective layer when the upper platform was pushed to the vicinity of the permanent slope line to carry out manual cleaning and tamping to meet the design slope requirements and then Promote the platform to the permanent slope near the line, the same reserved 1 to 2 meters thick protective layer, and then manually tampered to make it reach the design slope line. This kind of “separately advancing, separately clearing, finishing separately, and eventually ending up” method has resulted in the formation of a permanent slope