浅埋多煤层开采"两带"高度探测及覆岩力学性能分析
"Two-zone"height detection and mechanical properties analysis of overlying rock in shallow buried multi-coal seam mining
刘磐 1陈伟崇 1程志斌 2王帆3
作者信息
- 1. 榆林神华能源有限责任公司 青龙寺煤矿分公司,陕西榆林 719315
- 2. 河南理工产业技术研究院有限公司,河南焦作 454000
- 3. 河南创睿能源科技有限公司,河南焦作 454000
- 折叠
摘要
随着煤炭开采强度越来越高,采空区面积越来越大,"两带"高度的探测确定对于煤矿安全高效生产显得越发重要.采用钻孔冲洗液漏失量观测、钻孔水位观测、钻进异常现象观测、彩色钻孔电视观测等多种方法对青龙寺煤矿5 煤层上覆岩层破坏情况进行探测,综合分析确定青龙寺煤矿5-2煤层综采工作面开采条件下的最大垮落带高度为17.0 m,垮采比为7.4,最大导水裂隙带高度为46.87 m,裂采比为20.4.同时对5-2煤层上覆岩层的岩石力学性质测试并进行分析,将顶板覆岩岩性分为砂岩类岩层和泥岩类岩层两大类,在顶板以上70 m内,砂岩类岩层占比96.14％,自然状态下单轴抗压强度平均为67.82 MPa,覆岩属坚硬类型,具备坚硬顶板的特征.探测及力学分析结果可为青龙寺煤矿后续上行开采提供技术参考.
Abstract
With the increasing intensity of coal mining and the increasing area of goaf,the detection and determination of the"two-zone"height is more and more important for the safe and efficient production of coal mines.A variety of methods such as drilling flush-ing fluid leakage observation,drilling water level observation,abnormal drilling phenomena observation,color drilling TV observation were used to detect the damage of overlying rock in 5-2 coal seam of Qinglongsi Coal Mine.The comprehensive analysis determined that the maximum caving zone height of 5-2 coal seam fully-mechanized mining face in Qinglongsi Coal Mine was 17.0 m,the caving ratio was 7.4,the maximum water conducted zone height was 46.87 m,and the cracking ratio was 20.4.At the same time,the rock mechani-cal properties of the overlying rock of the 5-2 coal seam were tested and analyzed.The lithology of the overlying rock of the roof was di-vided into two categories:sandstone rock layers and mudstone rock layers.In the range of 70 m above the roof,the sandstone rock layers accounted for 96.14％.The average uniaxial compressive strength under natural conditions was 67.82 MPa.The overlying rock belongs to hard type and have the characteristics of hard roof.The results of this detection and mechanical analysis provide technical reference for the subsequent upward mining of Qinglongsi Coal Mine.
关键词
"两带"高度/钻孔冲洗液/漏失量/彩色电视观测/岩石力学测试Key words
"two-zone"height/drilling flushing fluid/leakage quantity/color TV observation/rock mechanics test引用本文复制引用
基金项目
国家重点研发计划项目(2018YFC0604502)
河南省高校科技创新人才支持计划(23HASTIT011)
河南理工大学创新型科研团队(T2022-2)
出版年
2024
NETL
NSTL
万方数据