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房柱式开采方法美国应用最广。但是,目前设计系统并不完善。本文综述了美国近几年来房柱式开采设计的研究成果,其主要内容是确定:①稳定的顶板跨距;②煤柱的强度;③安全系数。房柱式开采系统实际上是一个后退式开采系统。首先按一定的设计规范开掘出煤房,然后用后退方式回收煤柱。但不同的设计方式,煤柱的回收率也不同。提高回收率,还有较大的潜力,故改进房柱法的设计大有必要。房柱法的设计,应以地质条件和顶底板岩石的强度为基础。地质条件包括岩层的柱状图、地质构造的分布方向和赋存状
Housing-style mining method the most widely used in the United States. However, the current design system is not perfect. This paper summarizes the research results of the housing-pillar mining design in the United States in recent years. The main contents of the study are as follows: (1) Stable roof span; (2) strength of coal pillar; (3) safety factor. The column and column mining system is actually a reverse mining system. First of all, according to certain design specifications to dig out the coal house, and then use the way back to recover coal pillars. However, different design methods, pillars recovery rate is also different. Improve recovery, there is a great potential, so to improve the design of the Housing Act is necessary. The design of the column and column method should be based on the geological conditions and the strength of the top and bottom rock. Geological conditions include the histogram of rock strata, the distribution direction of geologic formations and occurrences