摘要
以N3201工作面掘巷期间瓦斯动力显现频发为工程背景,通过对覆岩内岩层分布特征及垮落带高度计算,确定将高抽巷布置于均厚为3.5 m的稳定砂质泥岩层中,进一步建立二维平面数值模型确定了高抽巷最优的水平间距为20 m,最佳支护方案为U型棚联合锚索直接支护。现场工业性试验阶段根据高抽巷内布置的十字测站监测到,随着3201工作面的回采推进,其围岩内顶底板移近量约为60 mm,两帮移近量约为21 mm,相较于原有巷道断面尺寸收敛率均小于2%.这表明高抽巷能够很好地服务于3201工作面的瓦斯治理作业,同时为具有类似条件的高抽巷围岩控制提供了指导意义。
Based on the engineering background of frequent gas dynamic appearance during the excavation of N3201 working face,through the calculation of the distribution characteristics of the strata in the overburden and the height of the caving zone,it is determined that the high drainage roadway is arranged in a stable sandy mudstone layer with an average thickness of 3.5 m.Further,a two-dimensional plane numerical model is established to determine that the optimal horizontal spacing of the high drainage roadway is 20 m,and the optimal support scheme is U-shaped shed combined anchor cable direct support.During the on-site industrial testing stage,according to the cross measuring station arranged in the high extraction roadway,it was monitored that as the 3201 working face was advanced,the displacement of the top and bottom of the surrounding rock was about 60 mm,and the displacement of the two sides was about 21 mm.Compared to the original roadway,the convergence rate of the cross-sectional size was less than 2%.This indicates that the high extraction roadway can effectively serve the gas control operation of the 3201 working face,and provides guidance for the control of surrounding rocks in high extraction roadways with similar conditions.
作者
张虎
ZHANG Hu(Caojiatan Mining Co.,Ltd.,Shaanxi Coal Industry,Yulin 719000,China)
出处
《煤》
2024年第1期12-17,86,共7页
Coal
基金
国家自然科学基金项目(52104091)
国家重点研发计划项目(2020YFB1314002)。
关键词
高位抽采巷
充填墙体
数值模拟
矿压监测
gas
high level extraction roadway
filling the wall
numerical simulation
mine pressure monitoring
作者简介
张虎(1989-),男,陕西榆林人,工程师,从事煤矿安全生产方面工作,E-mail:iceiceice185@163.com。
