浅埋煤层孤岛工作面区段煤柱宽度优化

为了掌握浅埋煤层矿压变化规律，同时解决因煤柱留设不合理而造成的煤炭资源浪费问题，以榆林双山煤矿308工作面与306工作面为工程背景，通过理论计算、数值模拟及工业性试验等方法，对306工作面区段煤柱合理留设尺寸展开研究。研究结果表明：极限平衡理论分析得出，煤柱内部弹性核区的宽度为3.8 m，区段煤柱极限宽度为11.4 m；数值模拟结果与现场实测数据相吻合。结合工作面实际生产地质条件，确定306工作面合理煤柱留设尺寸为11.5 m，并提出相应的巷道围岩支护方案。研究成果为浅埋煤层区段煤柱的尺寸留设提供了理论支持和技术指导，有助于有效提高煤炭回采率。

Study on the optimization of reserved size of section coal pillar in shallow buried working face

In order to master the law of pressure variation in shallow buried coal seam and solve the waste of coal resources caused by unreasonable arrangement of coal pillar, taking 308 working face and 306 working face of Yulin Shuangshan Coal Mine as the engineering background, through theoretical calculation, numerical simulation and industrial test, the reasonable reserved size of section coal pillar in 306 working face was studied. The results show that according to the limit equilibrium theory, the width of the elastic core zone inside the coal pillar is 3.8 m, and the limit width of the section coal pillar is 11.4 m. The numerical simulation results agree well with the field measured data. Combined with the actual production geological conditions of the working face, the reasonable reserved size of coal pillar in 306 working face is determined to be 11.5 m, and the corresponding supporting scheme of roadway surrounding rock is proposed. The research results can provide theoretical support and technical guidance for the reserved size of section coal pillar of shallow buried coal seam and effectively improve the rate of coal winning.