关键词: 地质钻孔, 突水溃沙, 防治, 溃沙漏斗, 突水口

Abstract: Taking Longde coal mine as example, based on particle flow and liquid flow theories, sand bursting funnel model and water bursting nozzle model were introduced to study the flow calculation model, the mechanism of water and sands bursting and control measures in Longde coal mine were proposed. The results show that compared with the sand bursting funnel model, the flow predicted by water bursting nozzle model is more consistent with the speculate result in Longde coal mine, which means that the model can better reveal the formation mechanism of water and sands bursting. According to the water bursting nozzle model, the aquifer thickness and borehole diameter are the two dominant factors which influence the bursting flow. Based on the constructed dynamic surface subsidence model, the central sedimentation value of surface sand inrush funnel, and the influence radius increase with time, but the acceleration decreases gradually. Prevention method that geological borehole should be investigated and plugged for prevention before the mining d esign has been developed, while a control measure that gradually changing the pipeline flow into fracture flow and pore flow, and finally implementing grouting and plugging has also been proposed.

Key words: geological borehole, water and sands bursting, prevention and control, sand bursting funnel, water bursting nozzle