摘要
为解决垮落带直覆下采煤面临的破碎顶板问题,提出了地面注浆加固思路,重点对钻探技术进行了系统研究。根据实际地层分布以及钻孔穿过垮落带特点,为确保浆液顺利到达目标层位,设计出了二开结构钻孔并选用了优质低固相膨润土的冲洗液解决孔壁坍塌等事故,同时建立了孔内事故预防措施技术体系。在此基础上,以淮北矿业许疃煤矿7228工作面为工程实例对钻探效果进行了分析。研究结果表明设计的二开结构钻孔有效的保证了钻探的顺利施工,揭露的基岩位置与原有资料基本吻合;基本查明了71煤采空区影响地层范围及裂隙发育特征,同时通过简易水文观测也验证了采空区裂隙加固效果较好。研究成果为地面注浆改造破碎顶板的钻探工程提供了技术保障。
Aiming at the broken roof in mining under the direct cover of caving zone,ground grouting reinforcement is put forward,and the drilling technology is studied systematically.According to the actual stratigraphic distribution and the characteristics of drilling through the caving zone,in order to ensure the grouting slurry to reach the target layer smoothly,the second opening structure drilling hole is designed.The high-quality low solid bentonite flushing fluid is selected to solve the hole wall collapse and other accidents.At the same time,the technical system of accident prevention measures is established.On this basis,taking the 7228 working face of Xutuan Coal Mine as an example,the drilling effect is analyzed.The research shows that the designed second opening structure drilling hole guarantees the smooth drilling,and the exposed bedrock position is basically consistent with the original data.Basically,the strata affected area of 71 coal goaf and characteristics of fracture development have been basically identified.It also proves that the crack reinforcement effect of goaf is favorable through simple hydrological observation.The research results provide technical support for the drilling project of ground grouting to reinforce broken roof.
作者
张桂芳
鲁海峰
年宾
姚多喜
张曼曼
李超
ZHANG Gui-fang;LU Hai-feng;NIAN Bin;YAO Duo-xi;ZHANG Man-man;LI Chao(College of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Chexplor Resource Exploration Technology Co.,Ltd.,Huaibei 235000,China)
出处
《煤炭工程》
北大核心
2020年第6期66-71,共6页
Coal Engineering
基金
国家自然科学基金资助项目(51474008)。
关键词
垮落带
破碎顶板
地面注浆
钻探技术
caving zone
broken roof
ground grouting
drilling technology
作者简介
张桂芳(1994—),女,安徽阜阳人,主要研究方向为水文地质与工程地质,E-mail:zl3155486176@163.com。
