摘要
针对巨厚松散层水害区域注浆治理效果缺乏有效检验方法的问题,提出井上-井下多指标立体检验方法。该方法通过后序孔岩屑录井、注浆层位取芯观测,以及对比分析注浆治理前后含水层水位、井下疏放水量、地层透水率、井下钻孔串浆等参数,对煤层顶板注浆治理效果进行检验。结果表明:依据后序孔、检验孔及取芯孔中黏土水泥结石块与荧光剂的分布,可判断浆液平面扩散距离为31.68~64.85 m,垂向扩散距离大于30 m;验证孔钻井液无异常消耗,说明治理后验证区内地层结构较为完整;验证孔注浆量远低于治理孔,表明治理孔对地层实现了良好的注浆充填;验证孔注浆未引发含水层水位变化且井下无串浆现象,显示原垂向导水通道已被有效封堵;治理完成后,井下放水检验孔出水量及出水钻孔数量均显著下降,表明“四含”与9煤顶板砂岩含水层间的水力联系通道被有效阻断,注浆治理达到预期目标,工作面具备安全回采条件。
Aiming at the problem of lacking effective inspection methods for the grouting treatment effect in water hazard areas of ultra-thick loose layers,a surface-underground multi-index stereoscopic inspection method is proposed.This method evaluates the effectiveness of grouting treatment in coal seam roof by analyzing subsequent borehole cuttings logging,core observation of grouted horizons,and comparative analysis of parameters such as aquifer water levels before and after grouting,underground water drainage volume,formation permeability,and the grout connectivity of underground boreholes.The results indicate that the planar diffusion distance of the grout ranges from 31.68 to 64.85 meters,while the vertical diffusion distance exceeds 30 meters,as determined by the distribution of clay-cement grout blocks and fluorescent tracers in subsequent boreholes,inspection boreholes,and core samples.No abnormal consumption of drilling fluid was observed in the inspection boreholes,suggesting that the formation structure within the treated area remains relatively intact after grouting.The grouting volume required for verification boreholes was significantly lower than that for treatment boreholes,demonstrating effective grout filling achieved by the initial treatment.Grouting in verification boreholes did not cause fluctuations in aquifer water levels,and no grout connectivity was detected underground,indicating that the original vertical water-conducting channels have been effectively sealed.Following the completion of grouting,both the water inflow volume and the number of water-producing boreholes during dewatering tests underground decreased markedly.This confirms that the hydraulic connection between the“Fourth Aquifer”and the sandstone aquifer above the No.9 coal seam has been effectively blocked,achieving the intended grouting objectives and ensuring safe mining conditions for the working face.
作者
闫鑫
丁湘
蒲治国
李哲
冯洁
纪卓辰
YAN Xin;DING Xiang;PU Zhiguo;LI Zhe;FENG Jie;JI Zhuochen(China Coal Energy Research Institute Co.,Ltd.,Xi’an 710054,China;China Coal(Ordos City)Energy Technology Co.,Ltd.,Ordos 017000,China;China Coal Xi’an Design and Engineering Co.,Ltd.,Xi’an 710054,China)
出处
《煤炭工程》
北大核心
2025年第8期64-71,共8页
Coal Engineering
基金
2024年度深地国家科技重大专项(2024ZD1000406)
陕西省青年基金项目(2025JC-YBQN-460)。
关键词
巨厚松散层
顶板水害
地面注浆
水力联系
注浆效果检测
ultra-thick loose layer
roof water disaster
ground grouting
hydraulic connection
grouting effect detection
