综放工作面极窄煤柱合理留设宽度研究

Study on Rational Set Width of Narrow Coal Pillar at Combined Mining Face

根据赵家寨煤矿三软厚煤层12206工作面特定地质条件,通过煤柱强度经验计算公式计算出合理煤柱宽度留设尺寸,运用有限差分方法(数值模拟),研究分析了留设不同窄煤柱尺寸时相应的应力分布和围岩破坏状态。根据郑州矿区实际地质和工程实践情况,与理论计算结果相比较,综合分析得出极窄煤柱宽度取2 m时,即在稳定的内应力场范围内布置极窄煤柱护巷,能够明显提高巷道围岩稳定状态,并能保证工作面安全性和采出率;为郑州矿区三软煤层矿井下一步煤层开采区段煤柱尺寸合理留设提供了依据,对于提高回采率具有一定借鉴意义。

Base on the geology condition of Zhaojiazhai Mine 12206 face,reasonable designed size of coal pillar is given var the calculation through the coal pillar strength formula of experience,use the finite difference method（numerical simulation）,study and analysis the corresponding state of stress distribution and damage of surrounding rock under the condition of remaining different size pillars.Combined with the actual situation,based on the theoretical calculation result,the reasonable narrow coal pillar size is 2 m and small deformation of the coal pillar and roadway,to ensure stope recovery. It provides an important basis to the following coal seam mining in design of section coal pillar in Zhengzhou mining area,have great reference meaning on improve stope recovery aspects.