摘要
通过对11504工作面开采条件分析,确认15煤层顶板岩性较弱,开采后导水裂缝带发育高度较小,第四系的坡积、残积的砂土、亚黏土及黏土等起到隔水层的作用,大气降水量是可控的,这些情况有利于安全开采。通过研究浅埋薄基岩煤层开采突水溃砂机理,认为11504工作面开采覆岩不具有天然的携沙基础、不具备形成突水溃砂的物源条件、突水溃砂直接动力源较小、不易于形成较大突水溃砂通道和不易形成突水溃砂的空间因素。同时,数值模拟研究表明,11504工作面开采完毕其上覆岩层裂隙发育并呈现不断增大的趋势,最终形成“梯形状”裂隙区域,其采空区垮落带高度与按照经验计算公式计算的垮落带高度基本一致(取下限)。11504浅埋薄基岩工作面可以安全开采。
Through analysis of the mining conditions of the 11504 working face,it is confirmed that the rock type of the roof of the 15th coal seam is weak,and the height of the water conducting fracture zone after mining is relatively small.The Quaternary slope deposit,residual sand,sub clay and clay play a role as water barriers,and the amount of atmospheric precipitation is controllable.These situations are conducive to safe mining.By studying the mechanism of water and sand inrush during shallow buried thin bedrock coal seam mining,it is believed that the 11504 working face does not have a natural sand carrying foundation,does not have the material source conditions to form water and sand inrush,has a small direct power source for water and sand inrush,is not easy to form large water and sand inrush channels,and is not easily affected by spatial factors.Meanwhile,numerical simulation studies have shown that the fractures in the overlying rock strata of the 11504 working face have developed and shown a continuous increasing trend after mining,ultimately forming a"ladder shaped"fracture area.The height of the collapse zone in the goaf is basically consistent with the height calculated according to empirical formulas(taking the lower limit).The 11504 shallow buried thin bedrock working face can be safely mined.
作者
陈庆申
Chen Qingshen(Production Technology Department,Guizhou Luzhong Mining Co.,Ltd.,Guizhou,551500)
出处
《当代化工研究》
2025年第12期130-132,共3页
Modern Chemical Research
关键词
浅埋煤层
薄基岩
防突水
溃砂
shallowburied coal seam
thin bedrock
prevent water inrush
sand collapse
