采矿与安全工程学报 ›› 2015, Vol. 32 ›› Issue (4): 592-596.

• 论文 • 上一篇    下一篇

复杂受压条件下不同尺寸煤柱破坏倾向性研究

  

  1. 太原理工大学采矿工艺研究所,矿业工程学院,山西太原 030024
  • 收稿日期:2014-09-13 出版日期:2015-07-15 发布日期:2019-09-02
  • 作者简介:何耀宇(1974—),男,山西省霍州市人,博士生,从事矿山压力与岩层控制方面的研究。
  • 基金资助:

    山西省联合基金项目(2012012012);地震动力学国家重点实验室开放基金项目(LED2011B05)

A study on damage proneness of coal pillars of different sizes under complicated compression conditions

  • Received:2014-09-13 Online:2015-07-15 Published:2019-09-02

摘要: 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。

关键词: 煤柱, 破坏倾向性, 危险指数, 数值计算

Abstract: Depending on actual compression conditions of on-site coal pillars, based on the characteristics of compression shear and tensility of rock mass damages, risk indexes of compression shear failures and tensile failures of coal pillars have been established through theoretical analysis, and the study has also analyzed the distribution laws of risk indexes of complicated compressed coal pillars and damage proneness characteristics of coal pillars, by adopting the method of numerical simulation, under conditions of different width-height ratios. The study has found that with the increase of coal pillar width, the compression-shear damage proneness, in turn, presents the characteristics of an elliptic structured type, an “X” + half elliptical, a half elliptical + double funnel type, and a half elliptical + double trapezoid structured type; tensile fracture proneness presents the characteristics of a rectangle hyperbola structure, an “X” + half elliptical, a double funnel type, and a double trapezoidal like structure. The ratio of height and width of coal pillars on risk indexes is of the periodic feature, showing itself as three stages of dramatic, gentle and zero impacts. The distribution of maximum principal stress represents an obvious end impact, when coal pillars compressed, complying with the Saint-Venant’s Principle.

Key words: coal pillar, damage proneness, risk indexes, numerical simulation