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

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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.

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Abbreviations

γ :

The bulk density of overlying strata

H :

The buried depth of overlying strata

q 1 (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

h i :

The thickness of overlying each stratum

v :

Poisson’s ratio of strata

E:

Elastic module of strata

a m :

The thin plate limit span of strike length

b m :

The thin plate limit span of inclined length

k :

The shape coefficient of a thin plate

S i :

The free space height of the ith layer stratum

M :

The mining thickness of coal seam

K j :

The broken expansion coefficient of the jth layer stratum

ωj :

Ultimate deflection of a thin plate

σ t :

Tensile strength

f k :

Firmness coefficient

d:

The half of strike span of equilibrium arch in laterite

F:

Horizontal reaction force

V:

Vertical reaction force

H g :

The distance from the top boundary of equilibrium arch to surface

h b :

Bedrock thickness

h li :

Mining-induced fractured zone height

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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).

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Authors and Affiliations

  1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, 221116, China

    Shiliang Liu, Wenping Li & Qiqing Wang

  2. Nuclear Industry Huzhou Engineering Survey Institute, Huzhou, 313000, China

    Yabing Pei

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  1. Shiliang Liu
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  2. Wenping Li
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Correspondence to Wenping Li.

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Liu, S., Li, W., Wang, Q. et al. Investigation on mining-induced fractured zone height developed in different layers above Jurassic coal seam in western China. Arab J Geosci 11, 30 (2018). https://doi.org/10.1007/s12517-018-3383-z

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