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Post-peak mechanical characteristics of the high-water material for backfilling the gob-side entry retaining: from experiment to field application

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Abstract

The gob-side entry retaining (GER) technique enables pillarless coal mining by using roadside backfilling body (RBB). Due to the advantages of fast curing and high bearing capability after a large post-peak deformation, high-water material is commonly used to construct the RBB. The post-peak properties of the high-water material sample and the concrete sample were compared through uniaxial compression test (UCT) and acoustic emission (AE) test. It is found that the uniaxial compressive strength (UCS) of the high-water material sample is 10.29 MPa with a relatively high post-peak strength. When the strain of the high-water material sample is 12.7 times that of the concrete sample, the loading capacity of the high-water material sample remains 59% of UCS. It is shown that the internal damage of the high-water material sample is very slow in the post-peak stage and remains much less undamaged than the concrete sample. The procedures of GER were studied by numerical simulation. The numerical results suggested that the high-water material roadside backfilling body (HMRBB) underwent elastic deformation, followed by plastic deformation as the panel advanced. The loading stress in RBB increased first and decreased to 74% of its peak strength. The final deformation of the backfilling side was 9% of its width. In the field, the post-peak bearing capacity of HWRBB was pronouncedly enhanced after the bolt reinforcement, leading to a 56% decrease of the deformation of the backfilling body side. The deformation and loading capacity of the backfilling body satisfied the safe operation requirements.

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Abbreviations

σpc :

Peak strength of concrete sample

σ sc :

Residual strength of concrete sample

σ pw :

Peak strength of high-water material sample

D :

Damage variable of the material

C 0 :

Total ring-down counts at which the rock sample is completed damaged

C d :

Accumulated ring-down counts

σ lt :

Strength of sample at loading termination

σ p :

Peak strength of sample

P :

Load on the backfilling body

q :

Weight of the overlying strata

M1, M2 :

Force from the adjacent blocks applied to the key block above the backfilling body

F g :

Support force from the gangue to the key block

L :

Key block length

x 1 :

Distance between the action points of the backfilling body to the hinge point

x 2 :

Distance between the gangue to the hinge point

AE:

Acoustic emission

GER:

Gob-side entry retaining

HM:

High-water material

HMRBB:

High-water material roadside backfilling body

MTS:

Material Testing System

RBB:

Roadside backfilling body

UCS:

Uniaxial compressive strength

UCT:

Uniaxial compression test

W/I:

Water to ingredient

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Acknowledgements

The authors thank Xinyuan coal mine for their support during the field work.

Funding

This research was financially supported by the Fundamental Research Funds for the Central Universities (2017XKZD06).

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Authors and Affiliations

  1. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, 221116, China

    Fei-teng Zhang, Xiang-yu Wang, Jian-biao Bai, Gong-yuan Wang & Bo-wen Wu

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  1. Fei-teng Zhang
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  2. Xiang-yu Wang
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  3. Jian-biao Bai
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  4. Gong-yuan Wang
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  5. Bo-wen Wu
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Correspondence to Xiang-yu Wang.

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The authors declare that there are no conflicts of interest.

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Responsible Editor: Zeynal Abiddin Erguler

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Zhang, Ft., Wang, Xy., Bai, Jb. et al. Post-peak mechanical characteristics of the high-water material for backfilling the gob-side entry retaining: from experiment to field application. Arab J Geosci 13, 386 (2020). https://doi.org/10.1007/s12517-020-05369-9

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