浅埋深大采高工作面长度变化对采场矿压规律的影响  

Influence of shallow buried high-cutting working face length on mine pressure behavior of stope

作　　者：王泽 WANG Ze(Bejing Huayu Engineering Co.,Ltd.,China Coal Technology Engineering Group,Beijing 100120,China)

机构地区：[1]中煤科工集团北京华宇工程有限公司,北京100120

出　　处：《煤炭工程》2021年第4期105-109,共5页Coal Engineering

摘　　要：针对浅埋深工作面矿压显现规律和影响因素的复杂性等问题,通过理论分析、现场监测和数值模拟的方法,对浅埋深工作面矿压特征与工作面长度变化规律进行研究。结果表明:采煤工作面应力拱高度随着工作面长度增加而增加,且工作面长度超过240m后,应力拱的高度趋于恒定值;随着采面长度的递增,其前方支承压力的影响范围会变大,其峰值位置也将愈加靠近采面煤壁,峰值呈现先增加后恒定的趋势;随着采面推进距离的递增,其前方支承压力的影响范围也逐步前移,其值也逐渐增加;工作面推进50m时,支承压力峰值与采面长度正相关,与至工作面中线距离负相关;采面长度越大,来压步距整体减小,井下采煤工作面顶板活动频率有增加趋势;工作面来压时,工作面支架载荷沿着工作面方向呈现为拱形分布,且工作面中点为其对称轴。In view of the complexity of strata behavior law and the complexity of influencing factors in shallow buried working face,the characteristics of mine pressure and the variation law of working face length in shallow buried working face are studied by theoretical analysis,field monitoring and numerical simulation. The results show that the height of stress arch increases as the working face lengthens,When the working face in longer than 240 m,the height of the stress arch tends to be constant;as the working face lengthens,the influence range of the front abutment pressure expands,the peak position is closer to the coal wall of the mining face,and the peak value increases first and then remain constant;as the mining face advances,the influence range of the front abutment pressure moves forward gradually,and its value rises gradually;when the working face advances50 m,the peak abutment pressure is positively correlated with the length of the mining face,and negatively correlated with the distance to the midline of the working face. The larger the mining face length is,the smaller the weighting interval is,and the results show that the roof activity frequency of coal mining face trends to increase;during the working face weighting,support load in the working face presents an arch distribution along the direction of the working face,and the working face midline is its symmetry axis.

关 键 词：浅埋深 工作面长度 采场压力 上覆岩层 拱形分布 来压步距 支承压力 

分 类 号：TD323[矿业工程—矿井建设]