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对于中厚以上的急倾斜矿床或极厚的缓倾斜矿床,在围岩不稳固、地表允许陷落的条件下,一般都选用崩落法开采。而当矿体又不稳固时,由于地压大,存在巷道难维护等问题,即使采用有底柱的或无底柱的分段崩落法,大多难以获得良好效果,必须采取相应措施加以改进。鉴于有底柱的和无底柱的分段崩落法各具其固有的优缺点,可以相互取长补短,笔者拟在简析国内几个矿山有关经验的基础上,对不稳矿岩条件下的分段崩落采矿法改进方案作一探讨。
For the moderately steeply inclined deposits or very thick, gently inclined deposits, rock is generally unstable in the surrounding rock, allowing the fall of the surface conditions, mining methods are generally used caving. However, when the ore body is not stable, due to the large ground pressure and the difficult maintenance of the roadway, even if the subsidence method with a bottom pillar or a bottomless pillar is adopted, most of the problems are difficult to obtain good effects and must be improved accordingly. In view of the bottom pillar and the subsea caving method with its own advantages and disadvantages of each have their own advantages and disadvantages, mutual complementarity, the author intends to analyze the experience of several mines in the country on the basis of unsteady rock conditions under the points Discussion on Improvement Scheme of Section Caving Mining Law.