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Experimental and simulation researches of loaded stress and gas environment on dynamics properties of gas-bearing coal during impact failure process

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Abstract

The engineering activities of deep stratigraphic resources development and space utilization are often subjected to complex stress conditions. In terms of gas-bearing coal resource mining, the dynamic mechanical properties of coal at complex loaded stress and gas environment were researched in this paper. Through the split Hopkinson pressure bar (SHPB), the dynamics experiments were performed, in which the factors of axial static load, circumferential confining pressure, internal gas pressure, and outside impact load were considered. Based on the stress and strain results of gas-bearing coal, the dynamic compressive strength and peak failure strain characteristics with strain rates were obtained. Under different loaded conditions, both dynamic compressive strength and peak failure strain added linearly along with strain rates increasing. In fact, high strain rates were the results of comprehensive loading conditions, so the effects of them to coal mechanical properties were discussed. And the improved dynamic material model of gas-bearing coal at high strain rates was proposed, which considered pre-damage of static load, hardening effects of strain rate, and weakening role of gas. Through using this model in numerical simulation, the plastic deformation and stress distribution of coal specimens subjected to impact failure were researched, which verified the results of dynamics experiments. Dynamics achievements of gas-bearing coal at complex loaded environment will provide guides for disaster prevention and promote green mining.

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Data availability

Derived data supporting the findings of this study are available from the corresponding author on request.

Abbreviations

σ(t):

Stress of specimen

σ :

Von Mises equivalent stress

σ ∗ :

Equivalent stress in normalized form

ε(t):

Strain of specimen

ε :

Equivalent plastic strain

\(\dot{\varepsilon}(t)\) :

Average strain rate

\({\dot{\varepsilon}}^{\ast }\) :

Strain rate without dimensionless

E :

Elastic moduli of incident/transmission bars

A :

Cross-sectional area of incident/transmission bars

A 0 :

Cross-sectional area of coal specimen

L :

Length of coal specimen

ε i :

Incident pulse signals

ε r :

Reflected pulse signals

ε t :

Transmission pulse signals

\({\varepsilon}_p^f\) :

Equivalent plastic strain in integration cycle

Δε p :

Equivalent plastic strain at constant pressure

C :

Propagation speed of stress wave in bars

t :

Duration time of stress wave in bars

T ∗ :

Relative temperature

p ∗ :

Hydrostatic pressure in normalized form

p :

Actual hydrostatic pressure

\({p}_g^{\ast }\) :

Gas pressure after normalization

D :

Compressive damage factor

f c :

Quasi-static uniaxial compressive strength

\({\mu}_p^f\) :

Plastic volumetric strain

Δμ p :

Plastic volumetric strain at corresponding conditions

m ′ :

Weakening coefficient of gas pressure

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Funding

The authors are grateful to the National Natural Science Foundation of China (51934007, 52074217, 51904236), China Postdoctoral Science Foundation (2021M693879), the Research Fund of the State Key Laboratory of Green and Low-carbon Development of Tar-rich Coal in Western China, Xi’an University of Science and Technology (No. SKLCRKF21-14), and Outstanding Youth Science Fund of Xi’an University of Science and Technology.

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Authors and Affiliations

  1. State Key Laboratory of Green and Low-carbon Development of Tar-rich Coal in Western China, Xi’an University of Science and Technology, Xi’an, 710054, Shaanxi, China

    Xiangguo Kong, Mengzhao Zhan, Chaolin Zhang, Shugang Li, Songrui Yang & Di He

  2. College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, Shaanxi, China

    Xiangguo Kong, Mengzhao Zhan, Yuchu Cai, Shugang Li, Songrui Yang & Di He

  3. Key Laboratory of Western Mine and Hazard Prevention, Ministry of Education of China, Xi’an, 710054, Shaanxi, China

    Xiangguo Kong, Mengzhao Zhan, Shugang Li, Songrui Yang & Di He

  4. School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an, 710054, Shaanxi, China

    Yuchu Cai

  5. Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China

    Chaolin Zhang & Enyuan Wang

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  1. Xiangguo Kong
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Correspondence to Xiangguo Kong.

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Kong, X., Zhan, M., Cai, Y. et al. Experimental and simulation researches of loaded stress and gas environment on dynamics properties of gas-bearing coal during impact failure process. Bull Eng Geol Environ 83, 16 (2024). https://doi.org/10.1007/s10064-023-03519-3

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