摘要
为研究厚土层薄基岩高强度开采覆岩破坏特征,以千树塔煤矿12305工作面为研究背景,综合运用UDEC数值模拟、现场实测和理论分析等方法研究了工作面开采后厚土层薄基岩类似地质条件下覆岩移动破坏规律。结果表明:随着工作面不断推进,覆岩破坏高度变化呈现出缓增、突增、稳定3个阶段,缓增和突增阶段主要发生在薄基岩中,而稳定阶段则发生在厚土层中,同时厚土层存在一定的液性指数,导致地表下沉滞后;通过冲洗液漏失量观测和注水试验得到该工作面导水裂缝带发育高度为84.5~86.5 m,裂采比为7.9~8.1,数值模拟及理论计算结果均与实测结果较为接近;阐述了厚土层薄基岩“两带”破坏模式,该模式中薄基岩和厚土层分别起到支撑和施荷的作用,薄基岩易被采动裂缝贯穿,而厚土层对采动裂缝的上向发育具有抑制作用。研究结果可为类似条件下矿井的安全生产提供参考。
To investigate the failure characteristics of overlying strata during high-intensity mining of thick soil layers and thin bedrock,this study examines the 12305 working face of Qianshuta Coal Mine.The movement and failure of overlying strata under geological conditions characterized by thick soil layers and thin bedrock after mining were analyzed using UDEC numerical simulation,field measurements,and theoretical analysis.The results showed that overburden failure height presented three stages:slowly increasing,suddenly increasing,and stable.The slowly increasing and suddenly increasing stages mainly occurred in thin bedrock,while the stable stage occurred in thick soil layers.Additionally,the thick soil layer exhibited a certain liquid index,leading to the lag of surface subsidence.By observing the leakage of flushing fluid and water injection tests,the height of the water flowing fractured zone in this working face was found to be 84.5-86.5 m,and the fracture-mining ratio was 7.9-8.1.The numerical simulation and theoretical calculation results were consistent with the measured results.The"two-zone"failure mode of thick soil layers and thin bedrock was also expounded,with thin bedrock acting as support and thick soil layers as load.The study provides useful reference for enhancing the safety of mining operations under similar geological conditions.
作者
张玉军
李友伟
肖杰
张风达
ZHANG Yujun;LI Youwei;XIAO Jie;ZHANG Fengda(Mining Research Branch,China Coal Research Institute,Beijing 100013,China;CCTEG Coal Mining Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China)
出处
《采矿与岩层控制工程学报》
北大核心
2023年第2期4-12,共9页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金面上资助项目(52174079,51874177)
天地科技创新创业基金资助项目(KJ-2021-KCMS-03)。
关键词
厚土层薄基岩
高强度开采
覆岩破坏特征
UDEC数值模拟
thin bedrock with thick soil layers
high-intensity mining
overburden failure characteristics
UDEC numerical simulation
