Stress analysis of three-dimensional roadway layout of stagger arrangement with field observation

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Cui, Zimo^1,3 ; Chanda, Emmanuel^2 ; Zhao, Jingli^1,3 ; Wang, Zhihe^2

School of Resource and Safety Engineering, China University of Mining and Technology, Beijing

100083, China^1

School of Civil, Environmental and Mining Engineering, University of Adelaide, SA

5005, Australia^2

State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing

100083, China^3

关键词: Cost-effective methods;    Economic evaluations;    Field observations;    Geological factors;    Long-term problems;    Longwall top-coal caving;    Slip-line fields;    Stress distribution characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/3/032035/pdf
DOI  :  10.1088/1755-1315/108/3/032035

来源: IOP

【 摘 要 】

Longwall top-coal caving (LTCC) has been a popular, more productive and cost-effective method for extracting thick (> 5 m) to ultra-thick coal seams in recent years. However, low-level recovery ratio of coal resources and top-coal loss above the supports at both ends of working face are long-term problems. Geological factors, such as large dip angle, soft rock, mining depth further complicate the problems. This paper proposes addressing this issue by adopting three-dimensional roadway layout of stagger arrangement (3-D RLSA). In this study, the first step was to analyse the stress environment surrounding head entry in the replacing working face based on the stress distribution characteristics at the triangular coal-pillar side in gob and the stress slip line field theory. In the second step, filed observation was conducted. Finally, an economic evaluation of the 3-D RLSA for extracting thick to ultra-thick seams was conducted.