公开(公告)号：US20250163804A1

公开(公告)日：2025-05-22

申请号：US19031453

申请日：2025-01-18

Applicant: Taiyuan University of Technology

Inventor： Jun GUO ,  Xiaoze WEN ,  Guorui FENG ,  Jinwen BAI ,  Ruipeng QIAN ,  Xu ZHANG ,  Jiahao ZHANG ,  Quan LIU ,  Zilong ZHANG ,  Xueyao WU

IPC: E21D9/00 ,  E21C41/18 ,  E21F15/00

Abstract: A method for recovery of residual coal pillars by freezing accumulated water in room-and-pillar mining areas is provided. A feasibility of repeated mining of residual coal pillars in room-and-pillar goafs is distinguished based on production data and exploration data of a mine. An accumulated water in the room-and-pillar mining areas is frozen to replace a paste filling material, which envelopes collapse roofs and gangues in the room-and-pillar goaf as a whole. The room-and-pillar goaf is filled with a frozen ice body. Roadways and mining faces are arranged in the frozen ice body. Coal cutter cuts the residual coal pillars and the frozen ice body. With the advancing of the mining face, the residual coal pillars are gradually recovered and melted water after the cutting is pumped out.