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以煤柱现场受压实际条件为依据,基于岩体破坏压剪和拉伸特征,通过理论分析建立煤柱压剪破坏和拉伸破坏危险性指标,采用数值模拟方法分析不同宽高比条件下复杂受压煤柱危险性指标分布规律及煤柱破坏倾向性特征。研究发现:随着煤柱宽度增加,压剪破坏倾向性依次呈现椭圆型、“X”+半椭圆型、半椭圆+双漏斗型、半椭圆+双梯形型结构特征;拉伸破坏倾向性呈现双曲线似矩形型、“X”+半椭圆型、双漏斗型、似双梯形型结构特征。煤柱宽高比对危险性指数的影响具有阶段性,呈现影响剧烈、平缓和零影响3个阶段,煤柱受压时最大主应力分布存在明显端头效应,且服从圣维南原理。
Based on the actual conditions of on-site coal pillars compression, based on the characteristics of compressive-shear failure and tensile failure of rock mass, the risk index of coal seam compression failure and tensile failure was established by theoretical analysis. The numerical simulation method was used to analyze the influence of different aspect ratios Complicated Compacted Coal Pillar Danger Index Distribution and Pillar Destruction Tendency. The results show that with the increase of the coal pillar width, the failure tendency of the compression-shear shows elliptical, “X” + semi-elliptical, semi-elliptical + double funnel, semi-elliptical + double trapezoidal structure characteristics; tensile failure tendency Sexual hyperbola-like rectangular shape, “X ” + semi-oval, double funnel-shaped, double-trapezoidal structure characteristics. The effect of coal pillar width to height ratio on the hazard index is of a stage, showing three stages of drastic, gentle and zero impact. The maximum principal stress distribution of coal pillar has obvious tip effect and obeys Saint Venant principle.