开拓巷道布置在茅口组灰岩中的岩溶水患防治技术

Karst Water Flooding Control Technology in Maokou Formation Limestone Development Workings

南方某煤矿地质及水文地质条件复杂,主采二叠系龙潭组煤层,主要充水水源为二叠系茅口组和栖霞组灰岩岩溶裂隙水,其一级充水通道为区内岩溶坝K5一仙洞河K1暗河强径河带。一采区550开拓系统布置在茅口组石灰岩中,在开掘进过程中,发生了多次突水灾害,走向长882m范围内遇出水点62个,其中涌水量大于100m3/h8个,最大达4 100m3/h,导致掘进工作中断。为防范水灾事故,实现550集中皮带运输大巷顺利贯通,矿方收集分析了采区的地质及水文地质条件,采取超前探测、钻孔注浆及验证等严密的防治水措施,保持20m超前距先治后掘,巷道转弯避开岩溶管道,最终实现安全贯通。

A South China coalmine has complex geological and hydrogeological conditions. Main water filling source of main mineable coal seams in the Permian Longtan Formation is from karst fissure water of Permian Maokou and Qixia formations. Its primary water filling channel is the underground river strong runoff zone from Yanrongba K5 to Xiandonghe K1. The 550 level developing system in No.1 winning district has been arranged in Maokou Formation limestone. During the driving, muhiple times of water bursting happened. Within an 882m range along the strike have 62 water points, 8 of which with outflow rate 〉100m3/h and caused interrupt of advancing. To prevent water flooding accident, realize smooth heading-through of the 550 level mother belt haulage main roadway, coalmine side has collected and analyzed data of winning district geological and hydrogeological conditions, taken rigorous water control measures of advanced detection, borehole grouting and verifying, keeping 20m advanced development distance to bring under control, turning off roadway to keep away from karst channels, finally realized safe heading-through.