Experimental study of strength properties of coal-rock under non-uniformly distributed load

Xiao Wang, Zhi Jie Wen*, Mikael Rinne, Bao Tang Shen, Jun Xie

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

The strength characteristics of coal-rock under non-uniform distributed load are investigated using a self-developed mining-induced stress testing system under different conditions of initial vertical stresses, initial horizontal stresses and stress transfer velocity. The results show that the external damaged coal-rock block has strengthened effect on the bearing capacity of internal coal-rock blocks. When the initial vertical stress, the initial horizontal stress and the stress transfer velocity are fixed, the internal bearing capacity of coal-rock is approximately twice that of the external coal-rock. With the increase of the initial vertical stress, the later period bearing capacity of the whole coal-rock is reduced and is located in the range of different initial vertical stress. There exists a difference in decreasing characteristics between internal- and external coal-rock. When under a lower initial vertical stress range, the reduction of strength of external coal-rock in the later period is higher than that of internal coal-rock. When under a relatively high initial vertical stress range, the reduction of mechanical strength of external coal-rock in the later period is lower than that of internal coal-rock. The higher the initial horizontal stress is, the higher the bearing capacity of coal-rock is. No matter in a higher or lower initial stress range, the incremental quantity of the later period bearing capacity of internal rock-coal is larger than that of external rock-coal. With the increase of stress transfer velocity, the peak strength of coal-rock is increased, and the effect of stress transfer velocity on the mechanical properties of internal coal-rock is more significant.

Original languageEnglish
Pages (from-to)723-730
Number of pages8
JournalYantu Lixue
Volume38
Issue number3
DOIs
Publication statusPublished - 10 Mar 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Initial horizontal stress
  • Initial vertical stress
  • Mechanical strength
  • Non-uniform distributed load
  • Stress transfer velocity

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