双巷布置综采工作面煤柱合理宽度研究

Research on rational width of coal pillar in double-lane fully-mechanized working face

针对察哈素煤矿厚煤层综采工作面因留设煤柱不合理而产生的双巷间围岩变形和破坏问题,利用工程类比、理论分析和数值模拟的方法,研究了巷道失稳原因和煤柱的合理宽度,并在现场进行了煤柱优化试验对研究结果进行验证。结果表明:察哈素煤矿地质及生产条件不适合留设窄煤柱,工作面煤柱宽度不足导致巷道两侧支承压力叠加,使得巷道维护困难。通过对比布设不同煤柱时采场应力、位移和塑性区分布情况,得出该矿合理的煤柱宽度为35m,优化设计有效改善了巷道失稳问题,并且提升了经济效益。

Aiming at the double-roadway large-range deformation and breakage caused by unreasonable coal pillar dimension of fully-mechanized working face in thick coal seam.Engineering analogy theoretical analysis and numerical simulation were carried out to find the reasons for roadway instability and reasonable width of coal pillar.In the spot,coal pillar optimization experiment was carried out to verify the results.The results show that narrow coal pillar was not reasonable under the geological and production conditions of Chahasu Coal Mine.The inadequate width of coal pillar leaded to abutment pressure superposition on two sides of roadway,casing difficulty in roadway.Through comparison of the distributing rules of stress,displacement and plastic zone under different-sized coal pillar,finally,a conclusion was made that the coal pillar width was 35 m.The optimization design had an obvious effect for roadway instability and improved economic benefits.