论文部分内容阅读
在井下开采工作中,总会遇到留设煤柱的问题。例如留设区段煤柱、顺槽煤柱、边界煤柱等等。从提高回采率的角度出发,一般希望将煤柱尺寸设计得尽可钥小,但为了保证煤柱具有较长时期的支承能力,则必须对留设的煤柱尺寸给予一定的限制,利用煤柱的宽高比来确定稳定煤柱的尺寸是一种简便有效的方法。 目前国外对煤柱合理的宽高比进行研究的方法不外乎经验法、试验法和计算法三种。所谓经验法,就是根据本矿区的特定条件,总结以往开采中留设煤柱的经验教训,然后确定一个适用的标准。例如澳大利亚将煤柱宽高比范围定为8至15,南非则将煤柱宽高比选作10。这些数字中都考虑了足够的安全系数,适用于这些国家“三下”开采条件。
In underground mining work, there is always the problem of leaving pillars. For example, set aside section of pillars, along pillars, border pillars and so on. From the perspective of improving the recovery rate, it is generally desirable to design the size of the coal pillar to be as small as possible. However, in order to ensure that the coal pillar has a long-term supporting capacity, certain restrictions must be imposed on the size of the remaining coal pillar. Column aspect ratio to determine the size of a stable pillar is a simple and effective method. At present, the method of studying the reasonable aspect ratio of coal pillars abroad is nothing more than the experience method, the test method and the calculation method. The so-called experience method is based on the specific conditions of the mine area, summarizes the experience of mining pillar in the past mining experience, and then determine a suitable standard. For example, in Australia, the coal pillar width to height ratio ranged from 8 to 15 while in South Africa, the coal pillar aspect ratio was chosen as 10. In these figures, sufficient safety factors are taken into account and are suitable for “three times” of mining conditions in these countries.