基于PFC的采空区斜坡覆岩损伤及变形机理模拟试验研究

Simulation Experimental Study on Damage and Deformation Mechanism of Overlying Rock in Goaf Slope Based on PFC

针对挖金湾虎龙沟4322工作面采空区边坡变形严重问题,通过对覆岩损伤规律与变形机理的研究,应用PFC软件建立斜坡地质模型,揭示了不同边界偏移距下斜坡变形过程和覆岩损伤规律。结果显示:当采空区外边界由外向内移动时,斜坡整体变形范围增大,裂隙分布范围逐渐增大并趋于稳定;斜坡的裂隙和压缩碎裂带分布范围最大。提出采动斜坡开采设计建议,从源头上防止采动斜坡演化为地质灾害。

Aiming at the serious deformation characteristics of the goaf slope in the 4322 working face of Hulonggou in Wajinwan,a slope geological model is established using PFC software through research on the damage law and deformation mechanism of the overlying rock.The characteristics and laws of slope displacement monitoring and slope crack expansion are analyzed.The results show that when the outer boundary of the goaf moves from outside to inside,the overall deformation range of the slope increases,and the distribution range of cracks gradually increases and tends to stabilize;the distribution range of cracks and compressive fracture zones on the slope is the largest.Propose design recommendations for mining slopes to prevent the evolution of mining slopes into geological hazards from the source.