TITLE

Numerical Analysis of Karst Water Inrush and a Criterion for Establishing the Width of Water-resistant Rock Pillars

AUTHOR(S)
Zhao, Yanlin; Luo, Shilin; Wang, Yixian; Wang, Weijun; Zhang, Lianyang; Wan, Wen
PUB. DATE
November 2017
SOURCE
Mine Water & the Environment;Nov2017, Vol. 36 Issue 4, p508
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Water-bearing caves in the Maokou limestone have caused disastrous water inrushes in mines in southern China. A linkage analysis between the hydro-mechanical coupling and the strength reduction method was used to investigate the stability of water-resistant rock pillars. The factor of safety (FOS) of the pillar was established, and a criterion for establishing the required width of the pillar was proposed in engineering practice, i.e., the width of the pillar should be based on the blast hole depth and blast-disturbance depth, along with a FOS of 1.5. The permeability of the water-resistant pillar and the probability of water inrush both increase as the strength reduction factor increases because the effective width of the pillar narrows. A numerical analysis of the Qiyi coal mine '4·16' water inrush accident shows that the cause of the inrush was that the 3.0 m wide barrier left by roadway excavation was too narrow to withhold the karst water pressure of about 4.0 MPa.
ACCESSION #
126260424

 

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