察哈素煤矿大采高综采面煤柱优化设计

Optimization design of coal pillar at large mining height fully-mechanized working face in Chahasu Coal Mine

针对察哈素煤矿回采巷道煤柱留设不合理产生的围岩变形和破坏问题,通过工程类比、理论分析和数值模拟方法研究了煤柱合理留设宽度,并在现场进行了煤柱优化试验。研究结果表明:察哈素煤矿的地质及生产条件不适合留设窄煤柱,大采高工作面基本顶形成的弧形三角块结构增加了留巷围岩结构载荷和煤柱宽度不足导致巷道两侧支承压力叠加,是导致巷道维护困难的主要原因。通过理论计算、对比不同煤柱时采场应力、位移和塑性区分布规律,得出该矿合理煤柱宽度为35 m。

Aim at the coal roadway widespread deformation and breakage problems due to unreasonable coal pillar dimension in Chahasu Coal Mine, the rational pillar size was designed by engineering analog, theoretical analysis and numerical simulation methods, the coal pillar optimization test and observation in site were also made. The results show that it was not suited for narrow coal pillar under the conditions of geological and production in Chahasu Coal Mine. The arc-triangle block structure formed by the hard basic roof increase stress on the coal pillar, and small pillar widths for roadway maintenance have caused the bearing stress superposition issues, and it is proved that the main existed difficult problem of roadway supporting was caused of the above two reasons. Through the theoretical calcu- lation and compared with the distributing rules of stress, displacement and plastic zone distribution with different coal pillar width, ulti- mately arrive at the conclusion of the coal pillar width is 35 m.