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

Yanlin Zhao, Shilin Luo, Yixian Wang, Weijun Wang, Lianyang Zhang, Wen Wan

Research output: Research - peer-reviewArticle

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.

Translated title of the contributionNumerical Analysis of Karst Water Inrush and a Criterion for Establishing the Width of Water-resistant Rock Pillars
LanguageSpanish
Pages1-12
Number of pages12
JournalMine Water and the Environment
DOIs
StateAccepted/In press - Feb 25 2017

Fingerprint

pillar
karst
rock
water
analysis
Numerical analysis
Rocks
Water
safety
coal mine
accident
cave
excavation
limestone
permeability
disturbance
engineering
method
Bearings (structural)
Caves

Keywords

  • Factor of safety
  • Hydro-mechanical coupling
  • Mining engineering
  • Strength reduction method

ASJC Scopus subject areas

  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Análisis numérico de la irrupción de agua karst y un criterio para establecer el espesor de los pilares de roca resistentes al agua. / Zhao, Yanlin; Luo, Shilin; Wang, Yixian; Wang, Weijun; Zhang, Lianyang; Wan, Wen.

In: Mine Water and the Environment, 25.02.2017, p. 1-12.

Research output: Research - peer-reviewArticle

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