Numerical investigation into effect of rear barrier pillar on stress distribution around a longwall face

作者：Ju Ming-he; Li Xue-hua^*; Yao Qiang-ling; Li Dong-wei; Chong Zhao-hui; Zhou Jian

来源：Journal of Central South University, 2015, 22(11): 4372-4384.

DOI：10.1007/s11771-015-2986-8

• numerical investigation
• stress distribution
• rear barrier pillar
• second open-off cut
• stress transfer

Numerical investigation was performed to examine the effect of rear barrier pillar on stress distribution around a longwall face. Salamon theoretical formula was used to calculate the parameters of the caving zone, which was later assigned to double yield constitutive model in FLAC(3D). Numerical results demonstrate that high stress concentration zone exists above the region where the second open-off cut intersects with the rear barrier pillar due to stress transfer and plastic zone expansion. It is also found that the maximum vertical stresses with varied distance to the seam floor are all within the projective plane of the rear barrier pillar and their positions concentrate on the barrier pillar adjacent to the connection corner of the second open-off cut. In addition, position of the maximum vertical stresses abruptly transfer from the connection corner adjacent to former panel to that adjacent to current panel along the panel direction.

• 出版日期2015-11
• 单位中国矿业大学（北京）