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Rock Mechanics and Rock Engineering

, Volume 52, Issue 11, pp 4547–4564 | Cite as

Effect of Fracture Heterogeneity on Rock Mass Stability in a Highly Heterogeneous Underground Roadway

  • Peng Kong
  • Lishuai JiangEmail author
  • Jiaming Shu
  • Atsushi Sainoki
  • Qingbiao Wang
Original Paper

Abstract

Rocks are a natural material with strong heterogeneity, and the heterogeneity affects the behavior and failure patterns of rocks and rock masses. Therefore, the factor of rock heterogeneity should not be neglected in cases of highly heterogeneous rock masses. In this study, the effect of heterogeneity on the rock mass stability in an underground coal mine roadway is investigated by introducing a stability analysis method that considers rock heterogeneity. The stability analysis method is combined with field investigation, laboratory testing, and numerical simulation. The rock mass heterogeneity is considered in the light of equivalent material properties, which are the heterogeneous rock mass properties weakened by heterogeneously distributed fractures. A Weibull distribution model is implemented into FLAC3D to characterize the rock mass heterogeneity. Sensitivity analyses regarding the rock mass properties and the mesh dependency are conducted to understand their effect on roadway deformation. A parametric study is performed to investigate the effect of the homogeneity index and other parameters that describe the rock mass fracturing intensity. The results show that the degree of rock mass heterogeneity has a significant effect on the roof deformation, failure extent, and other input parameters that describe the rock mass heterogeneity. The simulation results that are in good agreement with heterogeneity parameter data are estimated in the field. Thus, this method can be used as a back-analysis technique to obtain the homogeneity index and other input parameters through comparison to field deformation data, and can be applied to other engineering cases involving highly heterogeneous rock.

Keywords

Rock mass heterogeneity Fracturing Stability analysis Roadway 

List of Symbols

σci

Uniaxial compressive strength of intact rock

σc

Uniaxial compressive strength of the rock mass

GSI

Geological strength index

s, a, mi

Rock mass constants

σt

Tensile strength

mb

Reduced value of the material constant mi

Em

Young’s modulus of the rock mass

u

Mechanical property (strength, Young’s modulus, etc.)

u0

Scale parameter related to the average value of the mechanical property

m

Homogeneity index

n

The number of intervals

r

Correlation coefficient

xdfi

The quantity of the field data that falls into the ith interval over the total quantity of field data

\(\bar{x}_{\text{df}}\)

The average value of all the xdfi values

ydni

The quantity of the numerical data that falls into the ith interval over the total quantity of numerical data

\(\bar{y}_{\text{dn}}\)

The average value of all the ydni values

RQD

Rock quality designation

υ

Poisson’s ratio

C

Cohesion

Φ

Friction angle

cr

Residual cohesion

εp

Plastic parameter at the residual strength

CV

Coefficient of variation

σ

Standard deviations

E

Expected values

Notes

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Mining Disaster Prevention and ControlShandong University of Science and TechnologyQingdaoChina
  2. 2.State Key Laboratory for GeoMechanics and Deep Underground EngineeringChina University of Mining and TechnologyBeijingChina
  3. 3.International Research Organization for Advanced Science and TechnologyKumamoto UniversityKumamotoJapan

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