深部非爆卸荷帷幕的等效力学作用研究

Study on equivalent mechanical action of non-explosive destressing curtain at depth

深部非爆卸荷帷幕是对深部高应力高风险残留矿柱实现解危的重要方式,但仍然存在起效机制及力学作用不清晰等问题。通过理论分析优选帷幕排孔内部孔间距离,并采用数值模拟方法,建立非爆卸荷帷幕和对应的爆破切缝帷幕模型,通过非爆卸荷帷幕和爆破切缝帷幕应力场和碎裂不稳定区对比分析,探索深部非爆卸荷帷幕的等效力学作用。研究结果表明:非爆卸荷帷幕应力场和高应力碎裂不稳定的区分布与爆破切缝帷幕都具有高度的一致性,在力学上具有明显的等效作用。研究结果能够为类似条件下岩爆严重采场的解危提供理论支撑。

Non-explosive destressing curtain is an important way to relieve danger for the remnant pillar with high stress and high risk at depth.However,there are still some problems such as unclear formation mechanism and mechanical action.In this paper,the distance between the inner holes of the row was optimised by theoretical analysis,and the model of the non-explosive destressing curtain and the explosive slot curtain were established by using numerical simulation method.The equivalent mechanical effect of non-explosive destressing curtain at depth was explored by comparing and analysing the stress field and broken instability zone between the non-explosive destressing curtain and the explosive slot curtain.The results show that the non-explosive destressing curtain had a high consistency with the explosive slot curtain in the distribution of stress field and broken instability zone,and had obvious mechanical equivalent effect.The research results can provide theoretical support for the relief of serious rockburst stope under similar conditions.