摘要
鲁新煤矿由于向斜构造的发育及新近系与煤系的不整合接触导致煤层顶板结构复杂,同时煤层顶板成岩时间短,胶结性差,力学强度相对弱,煤层开采后发生突水甚至突水溃沙的可能性大。通过研究矿井水文地质边界、顶板含水层发育特征,以及主采煤层与主要含水层的空间组合关系、顶板岩层岩石力学性质,阐明了11煤复杂的顶板岩层结构。通过煤层采后顶板破坏的关键层理论分析、经验公式验证,结合周围矿区导水裂隙带实测资料,综合确定11煤采厚4m情况下,导水裂隙带发育高度为采厚的12.5倍。比较导水裂隙带发育高度与11煤层至各含水层间距,判断导水裂隙带发育层位;结合各含水层单位涌水量,将11煤顶板含水层充水危险性共分为五个等级。
Owing to syncline development and discordant contact between Neogene System and coal measures in the Luxin coalmine have caused coal roof complicacy.Moreover,because of coal roof diagenetic time short,poor cemented,mechanical strength relatively weak,after coal extraction,possibility of water bursting,even water-sand inrush hazards will be higher.Through mine hydrogeological boundary,roof aquifer development features,spatial combination relationship between main extraction coal seam and main aquifer,roof strata rock mechanical property etc studies have expounded coal No.11 complex roof structures.Through coal seam after extraction roof failure critical layer theoretical analysis,empirical formula verification,combined with peripheral mine area water conducted fissure zone measured data,have comprehensively determined water conducted fissure zone developed height is 12.5 times of shear height under coal No.11 shear height 4m condition.Then compared water conducted fissure zone developed height and intervals of coal No.11 to each aquifer,have judged of water conducted fissure zone development horizon.Combined with aquifer specific capacities have partitioned coal No.11 roof aquifer water filling hazard criticality into 5 categories.
作者
郑纲
王红梅
Zheng Gang;Wang Hongmei(Xi’an Research Institute,China Coal Technology and Engineering Group,Xi’an,Shaanxi 710054)
出处
《中国煤炭地质》
2022年第7期44-49,共6页
Coal Geology of China
基金
中煤科工集团西安研究院有限公司科技创新基金项目“西部侏罗系煤层顶板砂岩层预裂注浆技术开发”(2021XAYKF02)。
关键词
顶板含水层
煤水空间组合
导水裂隙带高度
充水危险性
roof aquifer
coal-water spatial combination
water conducted fissure zone height
water filling hazard
