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Laboratory investigation of the mechanical properties of coal-rock combined body

  • Zhan-bo ChengEmail author
  • Liang-Hui Li
  • Ya-Ning Zhang
Original Paper
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Abstract

Understanding the behavior of the top-coal caving mining face and immediate roof can be used to enhance buffering effects. The mechanical properties of the coal-rock combined body (CRCB) play a vital role in the performance of overburden load transmittance and support resistance design. We define and derive the relative physical and mechanical parameters of CRCB to illustrate and analyze the influence of coal-rock height ratio (CRHR), coal and rock mass behavior, and interface parameters on CRCB mechanical properties. We conducted uniaxial compression tests to obtain uniaxial compressive strength (UCS), elastic modulus (EM), and the full range of stress–strain curves. Our results show that UCS is positively correlated with EM. However, CRCB EM and UCS decrease with increasing CRHR or effective coal-rock height ratio (ECRHR) and the slope of the curves gradually decreases. CRCB mechanical parameters increase linearly with EM of the coal or rock mass. Although increased coal-rock interface angles (IA) lead to increased CRCB mechanical parameters, the incremental value can be ignored. Sensitive analysis shows that the rank of influential factors on CRCB properties is CRHR/ECRHR > coal strength > rock strength > IA.

Keywords

Coal-rock combined body Mechanical parameters Uniaxial compressive test Influence factors 

Abbreviation

AE

acoustic emission

CCR

coal-cement ratio

CRCB

coal-rock combined body

CRHR

coal-rock height ratio

CS

coal strength

ECRHR

effective coal-rock height ratio

EM

elastic modulus

FCR

fine soil-cement ratio

IA

interface angle

RS

rock strength

TCCM

top-coal caving mining

UCS

uniaxial compressive strength

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Notes

Acknowledgements

The authors acknowledge support from the China Scholarship Council (CSC). Many thanks to Baojin Yan for technical guidance in the uniaxial compressive test procedure. We thank the editors and anonymous reviewers for their valuable time and suggestions.

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Copyright information

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

Authors and Affiliations

  • Zhan-bo Cheng
    • 1
    • 2
    • 3
    Email author
  • Liang-Hui Li
    • 1
    • 2
  • Ya-Ning Zhang
    • 1
    • 2
    • 4
  1. 1.School of Energy and Mining EngineeringChina University of Mining and Technology–BeijingBeijingChina
  2. 2.Coal Industry Engineering Research Center of Top-coal Caving MiningBeijingChina
  3. 3.School of EngineeringUniversity of WarwickCoventryUK
  4. 4.Research Institute of Coal Strategy and Planning, Coal Industry Planning InstituteBeijingChina

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