Stress distributions in three-entry development under high horizontal stress

Peng, S. S. ; Chen, H.
Organization: Society for Mining, Metallurgy & Exploration
Pages: 6
Publication Date: Jan 1, 2000
Horizontal stress is an important factor that contributes to roof failure during longwall entry development, especially when the immediate roof is weak. In this paper, the effects of stress angle between the maximum horizontal stress and entry development and stress ratio of the maximum to minimum horizontal stresses on the stress distributions in the weak immediate roof of a three-entry system are analyzed using the finite element method. The results have confirmed that stress angle has a significant influence on the stress distributions. Generally, the three-entry system is in the worst stress condition when the stress angle is about 60° to 75° . The stress ratio has also some effects on the roof stresses.
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