(一)问题的提出 实践表明,用壁式崩落法开采顶板不稳固的缓倾斜薄矿体,一般是有效的。但是,当矿体倾角、厚度变化较大,底板起伏不平时,或者对于沿走向和倾向不连续的扁豆状矿体,应用壁式崩落法不仅顶板管理困难、坑木消耗大,而且矿石损失与贫化高、采矿工效低。因此,不少矿山都试验研究其它更为合理的采矿方法。 (I) Proposal of the Problems Practice shows that it is generally effective to use the wall caving method to mine the gently inclined thin ore body with unstable roof. However, when the dip angle and thickness of the ore body vary greatly, the bottom plate fluctuates unevenly, or for the lean ore body along the trend and tendency, the application of wall caving method is not only difficult to manage roof, pits and wood, but also ore loss and High depletion, low mining efficiency. Therefore, many mines experimentally study other more reasonable mining methods.