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.

公开(公告)号：US20220282619A1

公开(公告)日：2022-09-08

申请号：US17752842

申请日：2022-05-24

Applicant: Taiyuan University of Technology

Inventor： Guorui FENG ,  Yijiang FAN ,  Pengfei WANG ,  Chenliang HAO ,  Xiaoze WEN ,  Jun GUO ,  Jinwen BAI ,  Tingye QI ,  Jianan LIU ,  Linjun ZHU ,  Changquan WU

IPC: E21D20/02 ,  E21C41/18 ,  E21D21/00

Abstract: A method for carrying out grouting between adjacent gateroads in internal-staggered split-level coal mining. A return air gateroad of a stoping face and an inlet air gateroad of a heading face are not on the same level. The return air gateroad of the stoping face is arranged along a roof of a coal seam. The inlet air gateroad of the heading face is arranged along a floor of the coal seam. There is a height difference between the return air gateroad and the inlet air gateroad in a vertical direction. During the construction process, the inlet air gateroad is excavated at a delay distance of 180-200 meters from the return air gateroad. The drilling and grouting are performed while excavating the roadway, where grouting holes are arranged in a single row. A device for implementing the method is also provided.