“三软”煤层中高压注水效果研究

Study on the effect of high pressure water injection in "Three Soft" coal seam

该文分析煤层注水对煤体的不同作用机理;通过高压注水对工作面前方煤体应力分布影响数值模拟,得出注水压力越高,煤体塑性破坏范围越大、越快,压裂作用越明显;通过钻孔注水前后工作面前方应力变化的数值模拟,得出注水后工作面应力峰值前移且降低,缓解了煤壁压力,有利于煤壁稳定和工作面降尘,现场应用效果明显,有利于矿井安全生产。

Abstract： This paper analyzes the different mechanisms of coal seam injection; through the numerical simulation of stress distribution in front of the working face using the high pressure water injection, the injection pressure is higher, the coal body plastic damage range is bigger, faster, more obvious effect of fracturing; the numerical simulation of stress variation before and after water injection showed that the peak stress shifted forward and reduced, which alleviates the coal wall pressure, is conducive to the stability of coal wall and the working face dust, has obvious the field application effect, and is conducive to the mine safety production.