Investigation on mining-induced fractured zone height developed in different layers above Jurassic coal seam in western China

Original Paper
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Abstract

The mining-induced fractured zone height (MIFZH) is of significant importance for water hazard prevention and regional eco-environmental conservation in the Jurassic coal field of western China. The paper discussed MIFZH developed in bedrock and Neogene laterite from two aspects of field measurement and theoretical analysis respectively. In theoretical analysis of MIFZH developed in bedrock, based on plate and shell theory, each stratum in bedrock above the coalface stress-decreasing zone was simplified as four clamped rectangular plates, and the value of the ultimate deflection of the thin plate and the height of the free space in the lower part of the stratum were compared to judge MIFZH. When MIFZH was developed in Neogene laterite, MIFZH was calculated by Pu’s theory and rock mass limit equilibrium theory in theoretical analysis; in on-site measurement, micro resistivity scanning imaging logging technology (MRSILT), overcoming the shortage of fluid leakage technology, was adopted to detect MIFZH, where its measured result proved the feasibility of theoretical analysis. The research results have important significance to water conservation mining and safety mining of the Jurassic coal seam in western China.

Keywords

MIFZH Bedrock Neogene laterite Theoretical analysis On-site measurement 

List of symbols

γ

The bulk density of overlying strata

H

The buried depth of overlying strata

q1(x)

The linear triangular load caused by mining pressure in stress reduction zone

q(x)

The lateral total load on the rectangular thin plate

a

The strike length of overlying strata

b

The width of overlying strata

D

The bending stiffness of a thin plate

hi

The thickness of overlying each stratum

v

Poisson’s ratio of strata

E

Elastic module of strata

am

The thin plate limit span of strike length

bm

The thin plate limit span of inclined length

k

The shape coefficient of a thin plate

Si

The free space height of the i th layer stratum

M

The mining thickness of coal seam

Kj

The broken expansion coefficient of the j th layer stratum

ωj

Ultimate deflection of a thin plate

σt

Tensile strength

fk

Firmness coefficient

d

The half of strike span of equilibrium arch in laterite

F

Horizontal reaction force

V

Vertical reaction force

Hg

The distance from the top boundary of equilibrium arch to surface

hb

Bedrock thickness

hli

Mining-induced fractured zone height

Notes

Acknowledgements

The authors would like to express their gratitude to everyone who provided assistance for the present study. This research was financially supported by the Fundamental Research Funds for the Central Universities of China (Grant No. 2017XKZD07).

Supplementary material

12517_2018_3383_MOESM1_ESM.doc (48 kb)
ESM 1 (DOC 47 kb)

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Shiliang Liu
    • 1
  • Wenping Li
    • 1
  • Qiqing Wang
    • 1
  • Yabing Pei
    • 2
  1. 1.School of Resources and GeosciencesChina University of Mining and TechnologyXuzhouChina
  2. 2.Nuclear Industry Huzhou Engineering Survey InstituteHuzhouChina

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