高应力综放面区段煤柱合理宽度与控制技术

Reasonable segment pillar width and its control technology for fully mechanized top-coal caving face with high stress

针对综放面巷道围岩变形破坏严重等难题,以蒋家河煤矿ZF201工作面为工程背景,综合运用理论分析、数值模拟与现场试验等方法,研究了煤柱合理宽度确定方法及巷道围岩控制技术。研究表明:煤柱稳定性主要受上方基本顶断裂及多次采动活动的影响,随着煤柱宽度的增加,应力集中区域由实体煤侧向煤柱中部转移,塑性破坏区由煤柱两侧向中部呈"X"型贯穿趋势;综合考虑巷道稳定性及安全高效开采等因素,确定煤柱合理宽度为18 m;提出采用树脂加长锚杆及锚索补强组合支护系统进行巷道支护,现场监测表明煤柱受力呈不对称"双峰"分布,巷道围岩控制效果好。研究成果成功应用于工程实践,为类似条件下巷道布置提供了有益借鉴。

To address challenges which are serious deformations of the roadway surrounding rock in the fully mechanized top-coal caving mining face, comprehensive methods include theoretical analysis, numerical simulation and field test were used to analyze the problem of segment pillar design and con- trol in ZF201 working face of Jiangjiahe coal mine. mainly affected by the basic roof fracture and the The results indicate that the stability of coal pillar is multi-mining induced effects. With the increase of coal pillar width, the stress concentration area is transferred from the solid coal to the middle pillar and the plastic zone developing from the two sides into the central section with a ＂X＂ penetration trend. Considering the roadway stability and safe and efficient mining, the reasonable coal pillar width was optimized to be 18 m. With the application of resin-length bolts and cables reinforcing combined sup- port system, the field monitoring indicated that the coal pillar bear an asymmetrical ＂double-peak＂ typestress distribution and a good control effect for search results have been successfully applied in roadway layout with similar conditions. the roadway surrounding rock was achieved. The re- field practices, which provide a beneficial model for