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Comparative study of coal rocks compressive behaviors and failure criteria

  • Harinandan KumarEmail author
  • Upendra Singh Yadav
  • Subhash Kumar
  • Kishan Kumar
  • Ravi Yadav
  • Anveshika Shanker
  • Anurag Tripathi
  • Gitiksha Khandelwal
Original Paper
  • 39 Downloads

Abstract

The mining practice, particularly in underground mines, undergoes several geomechanical uncertainties including crack propagation due to machine operation and blasting. The geomechanical uncertainties reduce the stability of underground strata. Thus, the assessment of the strength parameters and failure criteria of the coal mass of the underground structure is crucial for safe mining practice. The paper deals with the experimental investigation of geomechanical properties of different coal samples obtained from Raniganj Coalfield, India. The uniaxial and triaxial compressive strength properties (compressive strength (MPa),Young’s modulus (MPa), bulk modulus (MPa), modulus of rigidity (MPa), Poisson’s ratio, axial strain, lateral strain, vertical stress (MPa), horizontal stress (MPa), cohesion (MPa), and internal friction angle (degree)) were determined as per the prescribed standard. The compressive strength of the coal samples varied from 2 to 7.07 MPa at the depth of 100 to 650 m. The corresponding axial and lateral strains varied from 0.0039 to 0.007 and 0.0012 to 0.03. The moduli (Young’s modulus, bulk modulus, and rigidity modulus) of the coal samples varied from 428.571 to 1683.333 MPa, 666.667 to 1309.259 MPa, and 150 to 654.63 MPa. The triaxial parameters like cohesion and angle of internal friction varied from 0.4 to 2 MPa and 31 to 43°. The failure behavior of the coal was determined using different failure criteria (Bieniawski’s empirical strength criterion, H-B criterion, and Vipulanandan correlation model) using the statistical method. The constant values obtained from the different failure criteria were utilized to predict the vertical stress. Based on the experimental observation and the predicted values using the established failure criteria, the design of the coal pillar was predicted. The innovation of this paper is to predict the application of the suitable failure criteria for the design of underground support system and determination of design parameters based on the predicted values.

Keywords

Compressive strength Rock failure criteria Regression analysis 

Nomenclature

τ

Shearing stress (MPa)

σ

Normal stress (MPa)

ϕ

Internal friction angle (degree)

C

Cohesion (MPa)

β

Angle (degree)

σp

Pillar strength (MPa)

σc

Compressive strength (MPa)

F

Compressive load (N)

d

Diameter of specimen (mm)

εa

Axial strain (%)

εl

Lateral strain (%)

ϑ or μ

Poisson’s ratio

E

Young’s modulus (MPa)

G

Modulus of rigidity (MPa)

K

Bulk modulus (MPa)

σ1

Vertical stress (MPa)

FS

Factor of safety

W or Wp

Width of pillar (m)

R

percentage of extraction (%)

h

Height of pillar (m)

ϒ

Height of pillar (2s2)

H

Depth of occurrence (m)

ρ

Density (kg/m3)

S

Hoek-Brown constant for intact rock

α

Constant

IS

Indian standard

σ3

Horizontal stress (MPa)

CMR

Coal mine regulations

RJCFL-M1-BC

Sample from Raniganj Coalfield in Barachak area

RJCFL-M2-CK

Sample from Raniganj Coalfield in Chinakuri area

RJCFL-M3-HIJ

Sample from Raniganj Coalfield in Hijli area

RJCFL-M4-NM

Sample from Raniganj Coalfield in Narsamuda area

RJCFL-M5-SV

Sample from Raniganj Coalfield in Shiv Dega area

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Harinandan Kumar
    • 1
    Email author
  • Upendra Singh Yadav
    • 1
  • Subhash Kumar
    • 1
  • Kishan Kumar
    • 1
  • Ravi Yadav
    • 1
  • Anveshika Shanker
    • 1
  • Anurag Tripathi
    • 1
  • Gitiksha Khandelwal
    • 1
  1. 1.Department of Petroleum and Earth SciencesUniversity of Petroleum and Energy StudiesDehradunIndia

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