Failure response of composite rock-coal samples

Hongwei Zhang, Derek Elsworth, Zhijun Wan

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems, it is of great significance to understand the static and dynamic mechanical behavior of rock-coal structures. In experimental scale modeling, rock-coal structures are usually considered as samples (typically φ50 mm × 100 mm) composed of rock or coal components. This work examines the coupled effects of height ratio (a ratio of the height of coal to the height of whole sample) and loading rate on the mechanical interactions of composite samples using granular dynamic models. Results show that: (1) The peak strength of the composite sample decreases with increasing height ratio, while the peak strength increases linearly with loading rate under uniaxial compression. (2) Both the height ratio and loading rate have a significant effect on the micro-cracking in the composite sample. Micro-cracking evolves with strain and this rate increases first slowly and then advances rapidly. (3) Composite samples fail in a progressive manner, and the failure of the coal components controls the collapse of the ensemble sample. Specifically, cracks develop preferentially in the coal and then propagate into the rock.

Original languageEnglish (US)
Pages (from-to)175-192
Number of pages18
JournalGeomechanics and Geophysics for Geo-Energy and Geo-Resources
Volume4
Issue number2
DOIs
StatePublished - Jun 1 2018

Fingerprint

coal
Rocks
Coal
rocks
composite materials
Composite materials
rock
loading rate
pillar
coal mining
Coal mines
dynamic models
Dynamic models
Hazards
hazards
crack
strain rate
bursts
compression
hazard

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geophysics
  • Economic Geology
  • Energy(all)

Cite this

@article{1e536afa57354529bbf9e9c89879f38f,
title = "Failure response of composite rock-coal samples",
abstract = "To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems, it is of great significance to understand the static and dynamic mechanical behavior of rock-coal structures. In experimental scale modeling, rock-coal structures are usually considered as samples (typically φ50 mm × 100 mm) composed of rock or coal components. This work examines the coupled effects of height ratio (a ratio of the height of coal to the height of whole sample) and loading rate on the mechanical interactions of composite samples using granular dynamic models. Results show that: (1) The peak strength of the composite sample decreases with increasing height ratio, while the peak strength increases linearly with loading rate under uniaxial compression. (2) Both the height ratio and loading rate have a significant effect on the micro-cracking in the composite sample. Micro-cracking evolves with strain and this rate increases first slowly and then advances rapidly. (3) Composite samples fail in a progressive manner, and the failure of the coal components controls the collapse of the ensemble sample. Specifically, cracks develop preferentially in the coal and then propagate into the rock.",
author = "Hongwei Zhang and Derek Elsworth and Zhijun Wan",
year = "2018",
month = "6",
day = "1",
doi = "10.1007/s40948-018-0082-x",
language = "English (US)",
volume = "4",
pages = "175--192",
journal = "Geomechanics and Geophysics for Geo-Energy and Geo-Resources",
issn = "2363-8419",
publisher = "Springer International Publishing AG",
number = "2",

}

Failure response of composite rock-coal samples. / Zhang, Hongwei; Elsworth, Derek; Wan, Zhijun.

In: Geomechanics and Geophysics for Geo-Energy and Geo-Resources, Vol. 4, No. 2, 01.06.2018, p. 175-192.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Failure response of composite rock-coal samples

AU - Zhang, Hongwei

AU - Elsworth, Derek

AU - Wan, Zhijun

PY - 2018/6/1

Y1 - 2018/6/1

N2 - To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems, it is of great significance to understand the static and dynamic mechanical behavior of rock-coal structures. In experimental scale modeling, rock-coal structures are usually considered as samples (typically φ50 mm × 100 mm) composed of rock or coal components. This work examines the coupled effects of height ratio (a ratio of the height of coal to the height of whole sample) and loading rate on the mechanical interactions of composite samples using granular dynamic models. Results show that: (1) The peak strength of the composite sample decreases with increasing height ratio, while the peak strength increases linearly with loading rate under uniaxial compression. (2) Both the height ratio and loading rate have a significant effect on the micro-cracking in the composite sample. Micro-cracking evolves with strain and this rate increases first slowly and then advances rapidly. (3) Composite samples fail in a progressive manner, and the failure of the coal components controls the collapse of the ensemble sample. Specifically, cracks develop preferentially in the coal and then propagate into the rock.

AB - To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems, it is of great significance to understand the static and dynamic mechanical behavior of rock-coal structures. In experimental scale modeling, rock-coal structures are usually considered as samples (typically φ50 mm × 100 mm) composed of rock or coal components. This work examines the coupled effects of height ratio (a ratio of the height of coal to the height of whole sample) and loading rate on the mechanical interactions of composite samples using granular dynamic models. Results show that: (1) The peak strength of the composite sample decreases with increasing height ratio, while the peak strength increases linearly with loading rate under uniaxial compression. (2) Both the height ratio and loading rate have a significant effect on the micro-cracking in the composite sample. Micro-cracking evolves with strain and this rate increases first slowly and then advances rapidly. (3) Composite samples fail in a progressive manner, and the failure of the coal components controls the collapse of the ensemble sample. Specifically, cracks develop preferentially in the coal and then propagate into the rock.

UR - http://www.scopus.com/inward/record.url?scp=85056346731&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056346731&partnerID=8YFLogxK

U2 - 10.1007/s40948-018-0082-x

DO - 10.1007/s40948-018-0082-x

M3 - Article

AN - SCOPUS:85056346731

VL - 4

SP - 175

EP - 192

JO - Geomechanics and Geophysics for Geo-Energy and Geo-Resources

JF - Geomechanics and Geophysics for Geo-Energy and Geo-Resources

SN - 2363-8419

IS - 2

ER -