一、前言在我国金属矿山中,緩傾斜、頂板中等稳固或不稳固的中厚矿体占有一定的比重。开采这种矿床,普遍存在着的問題是:(1)采矿压力控制与采区頂板管理困难,采场工作不够安全(一般开采緩傾斜中厚矿体,頂板管理劳动消耗量約占回采总劳动消耗量的15—20％,而急傾斜仅占8—15％),頂板的突然大量崩落,常迫使采区停产或报废,造成矿产資源損失。(2)留矿柱过多,一般情况下矿柱很难回采,且回采率很低,常在50—60％以下,或不能回收。(3)不能用重力运搬,常在較大的頂板暴露面积下 I. Introduction In China’s metal mines, moderately-inclined orebodies with moderately inclined roofs and moderately stable roofs occupy a certain proportion. The common problems in the exploitation of such deposits are: (1) difficulties in mining pressure control and roof management in mining areas and insufficient safe working of stope (General mining moderately inclined moderately thick ore body, roof management labor consumption accounts for about total recovery of labor 15-20% of consumption, while steep tilt accounts for only 8-15%), the roof suddenly a large number of caving, often forced the mining area discontinued or scrapped, resulting in loss of mineral resources. (2) Too many ore column, under normal circumstances difficult to mine pillars, and the recovery rate is very low, often less than 50-60%, or can not be recovered. (3) can not be transported by gravity, often in the larger roof exposed area