复杂结构薄煤层工作面煤壁破坏规律及应用

Failure law and application of complex structure thin coal seam mining face

含结核及夹矸薄煤层综采设备研制及开采工艺设计需依据矿山压力规律。采用理论分析、数值模拟、井下实测等方法，研究了薄煤层支承压力与煤壁破坏规律、支架阻力与煤壁破坏的关系，提出了利用矿山压力作用的合理截深与支护强度。研究表明：薄煤层工作面煤壁非弹性区宽度小，支承压力峰值位置距煤壁近，煤壁破坏深度仅0．5-0．6m；深度0．6m处的煤体抗压入强度是0．2m处1．5倍；利用矿山压力降低截割难度的小截深为0．4～0．6m；支架阻力对煤壁破坏深度有明显影响，利用矿山压力破煤的合理工作阻力为2600kN。通过应用实现了结核及夹矸的有效截割或剥落。

Fully mechanized equipment development and mining process design about the thin coal seam with nodules and parting should be based on law of mine pressure. By the means of the theoretical analysis, numerical simulation, underground observation methods, authors studied on supporting pressure and the law of coal wall failure about the thin coal seam, and the relationship between support resistance and the coal wall failure, put forward the reasonable cutting depth and supporting strength with the usage of mine pressure effect. Research show that the coal wall inelastic zone width of thin seam mining face is small, the distance between supporting pressure peak position and the coal wall is small, coal wall damage depth is only 0.5-0.6 m; depth of 0.6 m is 1.5 times as big as depth of 0.2 m in resistance indentation strength ; the small depth-web is 0.4-0.6 m on the usage of mine pressure to reduce the difficulty of cut- ting;support resistance has obvious effect on coal wall damage depth, the reasonable working resistance of breaking coal is 2 600 kN on the usage of mine pressure. Through the application we have realized the effectively cut of nodules and parting.