doi:10.16186/j.cnki.1673-9787.2021050126

Received:2021/05/27

Revised:2021/11/10

Published:2022/07/15

Study on grouting reconstruction technology of aquifer in coal seam roof

HUANGBeihai 1, LUOShaohe 2

1.Jiaozuo Coal Industry Group Limited Liability Company， Jiaozuo 454002 ， Henan， China， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;2.Institute of Resources and Environment， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China

Abstract: Taking the grouting reconstruction of coal seam roof aquifer in 2103 working face of Luoyang Zhengxingsumei coal industry Co.,Ltd. as an example, the large-area grouting reconstruction technology was used to reconstruct the aquifer on thin bedrock of coal seam roof into aquiclude or weak aquifer ,so as to eliminate the water threat to the mining face. According to the “Detailed Rules for Coal Mine Water Prevention and Control”, through numerical calculation and field test, the drilling structure , stage height of grouting, drilling plane layout,grouting pressure control,final hole grouting volume standard, grouting coverage and grouting material formula were designed. The technologies of ground producing slurry ,drilling sectional grouting and high-pressure grouting and filling were adopted to grout and fill the water-rich area of gravel layer above thin bedrock of coal mining face roof. This method effectively reconstructed the upper aquifer of thin bedrock of coal seam roof into weak aquifer ,and blocked the lateral and vertical recharge of water source in the upper aquifer of thin bedrock of coal seam roof. Using the grouting reconstruction technology of coal seam roof aquifer, the threat of pore water in the upper part of aquifer of thin bedrock of coal seam roof to the mining face was eliminated,and the expected safety goal was achieved. The mining thickness of thin bedrock of coal seam roof was reduced to 5 m,which provided effective for coal mining under the condition of thin bedrock of the same type ofcoalseam roof.

Key words:coal seam roof;thin bedrock;aquifer;drilling structure;stage height of grouting;grouting reconstruction

煤层顶板含水层注浆改造施工技术研究_黄北海.pdf