三软沿空掘巷合理护巷煤柱宽度研究

Study on Reasonable Width of Gob-Side Entry Driving in Three Soft Coal Seam

摘要: 利用FLAC^3D数值模拟方法，针对某三软煤层，分析掘进和回采期间，沿空掘巷留设不同宽度护巷煤柱时，围岩的应力和位移分布状况，并根据分析结果，选择了合理的护巷煤柱宽度，研究结果表明：掘进期间和回采期间，实体煤侧的最大垂直应力均受煤柱宽度的影响不大，煤柱侧的最大垂直应力均随煤柱宽度的增大而增大；煤柱为5 m时，煤柱侧处于卸载状态；掘进期间和回采期间，巷道两帮移近量、巷道顶板下沉量及巷道底鼓量均在煤柱为5 m时最小；故三软沿空掘巷合理煤柱宽度应为5 m。

Abstract: Using the FLAC^3D numerical simulation method, the stress and displacement distribution of sur-rounding rock for the three soft coal seam were analyzed during driving and coal winning period when the different width coal pillars to protect roadway were placed under gob-side entry driving condition. Based on the analysis results, reasonable width of protecting roadway coal pillar was selected. The research results show that the coal width had little effect on the greater vertical stress in entity coal side and the greater vertical stress in coal pillar side increased with the width of coal increasing. The coal pillar was in a situation of unloading when the width of coal pillar was five meters. The displacement of the surrounding rock was the least when the width of coal pillar was five meters. Therefore, the reasonable width of protecting coal pillar should be five meters.