由河北煤研所完成的四灰导水含水层井下小帷幕注浆截流新技术研究课题日前通过了河北煤管局组织的技术鉴定。该课题针对煤层顶板四灰岩层导水能力强出水量大,给煤矿生产和安全构成严重威胁的实际情况,在山东碗窑头煤矿进行了井下小帷幕动水注浆截流试验。试验采用在普通CS浆材 Hebei coal research institute completed the four gray aquifers underground curtain grouting closure of new technology research project recently passed the Hebei Coal Administration organized the technical appraisal. In this paper, aiming at the fact that the water discharge capacity of the four limestones in the roof of coal seam is high, which poses a serious threat to coal mine production and safety, a pilot project was carried out in Xiaoyao head mine in Shandong Province. The test used in ordinary CS slurry