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Experimental study on creep characteristics of infiltrated coal-rock under load

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Abstract

A series of laboratory tests were conducted, analyzing the influence of stress level and infiltration time on the creep properties of the coal-rock. The total damage variable based on damage mechanics is defined based on the coupling of the infiltration damage variable based on macro-benchmark variable and the stress damage variable based on creep timeliness, by characterizing the pattern of the infiltration–stress coupling effect on the total damage variable. The study shows that coal-rock underwent a process from surface drying and shrinkage to water absorption and swelling to water-filled infiltration damage in the infiltration test. With the increase of infiltration time, the water content of coal-rock tended to increase and eventually stabilizes, while the uniaxial compressive strength was gradually decreased. With the increase in stress level and infiltration time, the stable creep strain of coal-rock kept increasing, which accelerated creep advance, and its internal damage continued to accumulate and eventually led to destabilization damage. At the same stress level, mechanical parameter continued to decrease. Comparing the theoretical model of infiltrated coal-rock creep with the experimental data, the model developed in this paper reflected the whole process of infiltrated coal-rock creep deformation and damage and can characterize the influence of infiltration time and stress level on coal-rock creep properties.

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Data availability

The [DATA TYPE] data used to support the findings of this study are available from the corresponding author upon request.

Abbreviations

ε :

Total strain of the infiltrated coal-rock

ε 0 :

Instantaneous strain

ε ve :

Viscoelastic strain

ε 1 :

Viscosity strain

ε p :

Plastic strain

σ 0 :

Stress on the coal-rock

E 0 :

Instantaneous modulus of elasticity

E 1 :

Deceleration stage elastic modulus

η 1, η 2 :

Viscous hysteresis coefficient

t :

Creep time

S :

Total area

S 1 :

Damaged part area

S 2 :

Undamaged part area

S w :

Infiltration damage area

D w :

Infiltration damage variable

S 3 :

Infiltration and stress coupling damage area

S 4 :

Stress damage area

D :

Stress damage variable

D m :

Total damage variable

σ 0 :

Stress level of coal-rock

σ s :

Yield strength of the damaged body

σ 1 :

Undamaged part stress

E 2 :

Modulus of elasticity in the accelerated phase

C, v :

Coal-rock material parameters

t F :

Creep life

R w :

Uniaxial compressive strength of the coal-rock specimen in the infiltrated state

R d :

Uniaxial compressive strength of the coal-rock specimen in the dry state

T :

Infiltration time

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Acknowledgements

The authors are grateful for financial support from the National Natural Science Foundation of China (Nos. 12172280, 42077274) and the Key Technology Innovation Team Project of Shaanxi Province (No. 2020JZ-53).

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Authors and Affiliations

  1. Department of Mechanics, Xi’an University of Science and Technology, Xi’an, 710054, China

    Huimei Zhang

  2. College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Huimei Zhang, Fuyu Wang & Gengshe Yang

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Zhang, H., Wang, F. & Yang, G. Experimental study on creep characteristics of infiltrated coal-rock under load. Arch Appl Mech 93, 1331–1349 (2023). https://doi.org/10.1007/s00419-022-02331-x

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