Stress distribution characteristics in the vicinity of coal seam floor

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: Coal recovery;    Cost-effective methods;    Floor heave;    Longwall top-coal caving;    Maintenance cost;    Numerical calculation;    Slip-line fields;    Stress distribution characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/3/032056/pdf
DOI  :  10.1088/1755-1315/108/3/032056

来源: IOP

【 摘 要 】

Although longwall top-coal caving (LTCC) has been a popular, more productive and cost-effective method in recent years, roadway floor heave and rock bursts frequently appear when exploiting such coal seams with large dip angle. This paper proposes addressing this problem by adopting three-dimensional roadway layout of stagger arrangement (3-D RLSA). In this study, the first step was to analyse the stress distribution characteristics in the vicinity of coal seam floor based on the stress slip line field theory. In the second step, numerical calculation using FLAC3D was conducted. Finally, an evaluation of the 3-D RLSA for solving this particular issue was given. Results indicate that for this particular mine the proposed 3-D RLSA results in 24% increase in the coal recovery ratio and a modest reduction in excavation and maintenance costs compared to the conventional LTCC method.