ICGCM Papers:
Chinese Mining Practices and Solutions
 
 
Underground Longwall Mining with the Impact of Disturbed Areas By Abandoned Gateroads and Small Gobs
35th International Conference on Ground Control in Mining
Underground Longwall Mining with the Impact of Disturbed Areas By Abandoned Gateroads and Small Gobs
by
Yang LiEnguang ZhuKangning Zhang, China University of Mining and Technology Beijing, Beijing, China
Download PDF Add to My Library
[Conference] 35th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Chinese Mining Practices and Solutions
[Author] Yang LiEnguang ZhuKangning Zhang, China University of Mining and Technology Beijing, Beijing, China
[Abstract] 
Key Conclusions:
fiogf49gjkf0d
The results show that, in the process of panel face passed through the abandoned gateroads, the angle of the panel face was adjusted to 7°-10°, the headgate should be 20m advanced than the tailgate. The abandoned gateroads on both sides of coal pillars have not damaged at the same time, no large-area pressure concentration was happened above the main roof. Therefore, the coal resources of disturbed areas can be successfully recovered by using underground longwall mining.
Key Findings:
fiogf49gjkf0d
In this paper, protem EM-47 TEM instrument was used to detect the exact location of the old gobs caused by excavating the small panels with geological conditions of Cui Jiazhai Coal Mine in the northwest of China. On the basis of the detection, three-dimensional geological model of destruction was established. By using FLAC-3D numerical simulation software, the stress distribution was simulated when the panel face passed through the disturbed areas. The reasonable angle of the panel face was analyzed when the panel face passed through the abandoned gateroads.
Objective of the Paper:
fiogf49gjkf0d
Therefore, reasonable recovery mining technology must be taken to reclaim the wasted resource in disturbed coal areas.
Problem Statement:
fiogf49gjkf0d
Due to the use of outdated mining technology or room and pillar mining process in small coal mines, the resource recovery rate is only 10% to 25%. In many regions of China, the damage area caused by the small coal mines mining amounted to nearly one hundred square kilometers.