把关河石灰石露天矿采场西部于1981年6月10日20时40分发生滑坡(2~#滑坡)。这是我国露天矿目前规模最大的一次滑坡。滑坡体高245米(从1400米水平算起)、走向宽350米、倾向宽450米,滑落量约1000万吨,复盖了采场西部所有台阶。人员、设备无损,却阻断了中、东部的运输线路,使生产无法进行(图1)。为尽快恢复矿山生产及充分利用国家资源,对这次滑坡进行了试验研究、分析评价和适当处理。结果表明:在滑体以东不宜按原设计推进、又无其它矿石基地的情况下,预计可采出矿石 Landslide (2 ~ # landslides) took place in the west of the limestone open pit in the Kuan River at 20:40 on June 10, 1981. This is the largest of the current open pit mine in China. The landslide height of 245 meters (from 1400 meters level), to the width of 350 meters, the tendency of 450 meters wide, slipped about 10 million tons, covering all the steps of the western stope. Personnel and equipment are non-destructive, but they have blocked the transportation routes in the east and the east and prevented the production (Figure 1). In order to resume mine production as soon as possible and make full use of national resources, the landslide was experimentally studied, analyzed, evaluated and properly disposed of. The results show that: in the east of the slide should not push the original design, and no other ore base case, is expected to be ore