FROZEN AQUIFER-BASED METHOD FOR UNDERGROUND LONGWALL FACE COAL MINING UNDER WATER-CONTAINING CONDITION

摘要

A frozen aquifer-based method for underground longwall face coal mining under water-containing condition. Said method considers overburden movement features during mining, comprising: by means of target aquifer spatial position, face mining size, buried depth and mining subsidence parameters, determining parameters such as the position, thickness and freezing time of a frozen curtain of an aquifer before mining; performing extraction on the face after the frozen curtain is formed; and after the extraction on the face has been completed for a certain period of time, performing unfreezing to recover aquosity of the aquifer. Said method is simple and easy to practice, has a reasonable design, and is able to achieve safe and efficient coal mining based on water resource protection, coordinating resource mining with ecological environment protection.