弱胶结软岩地层大巷保护煤柱宽度的优化

Optimization of protective pillar width of main roadway in weakly cemented soft rock stratum

为获得弱胶结软岩围岩下大巷保护煤柱宽度的优化方法,以西部某矿11303工作面为研究对象,建立力学模型,理论计算、现场监测获取超前支承压力分布特征,分析弱胶结性质对煤柱宽度影响,确定大巷煤柱宽度范围,通过FLAC^(3D)模拟软件优化了煤柱宽度。结果表明,随煤柱宽度减少,煤柱内部塑性区范围增加,在煤柱宽度减小至120 m后,塑性区及超前支承压力降低不明显,大巷保护煤柱宽度优化为120 m,优化后煤柱宽度能够保证大巷稳定性。

This paper aims to identify an optimization method for protecting coal pillar width of the main roadway under the condition of weakly cemented soft rock surrounding rock.The study building on the 11303 working face of a mine in the west involves obtaining the distribution characteristics of advanced abutment pressure by establishing a mechanical model,theoretical calculation and on-site monitoring;analyzing the influence of weak cementation on the coal pillar width;determining the width range of roadway coal pillar;and optimizing the width of coal pillar with FLAC^(3D) simulation software.The results show that the inside deformation area of the coal pillar increases with the decrease of coal pillar width;with the decrease of coal pillar width to 120 m,the deformation area and advanced abutment pressure decrease inappearently;thereby,the protective pillar width of the roadway with optimized 120 m can ensure the stability of the roadway.