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Deformation and Failure Characteristics of Strong-Weak Coupling Structures with Different Height Ratios Under Cyclic
Aikun Chen1,2, Cheng Zhai1,2, Xu Yu1,2
1School of Safety Engineering and Research Center for Coal Mine Gas Control, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
ACS Omega
|April 22, 2024
Summary
Strong-weak coupling technology prevents coal and gas outbursts by reinforcing mine structures. Increasing the height ratio (HR) enhances failure strength and shifts damage from brittle to ductile, improving mine safety.
Area of Science:
- Geotechnical Engineering
- Mining Engineering
- Materials Science
Background:
- Coal and gas outbursts pose significant hazards in underground mines.
- Strong-weak coupling structures are susceptible to failure under mining disturbances.
- Hydraulic punching and grouting reinforcement are key technologies for outburst prevention.
Purpose of the Study:
- To investigate the mechanism of outburst hazards in strong-weak coupling structures during mining.
- To analyze the mechanical behavior and failure modes of these structures under cyclic loading.
- To evaluate the influence of height ratio (HR) on the structural integrity and failure characteristics.
Main Methods:
- Cyclic loading and unloading experiments were conducted on samples with varying strong-weak height ratios (HRs).
- Noncontact full-field strain testing (Digital Image Correlation - DIC) was employed to monitor deformation.
- Acoustic Emission (AE) system was used to detect and analyze micro-fracturing events.
Main Results:
- Failure strength increased with higher HRs. Residual strain in both strong and weak structures exhibited three deformation stages.
- Deformation initiated at the strong-weak interface and was concentrated in the weak structure.
- AE signals showed regional characteristics and the Felicity effect, with damage peaking around 70% of each loading stage. Higher HRs promoted ductile and tensile damage in the weak structure and tensile damage in the strong structure.
Conclusions:
- The height ratio significantly influences the failure strength and deformation behavior of strong-weak coupling structures.
- Increasing HR transitions the failure mode from brittle to ductile and from shear to tensile, enhancing structural stability.
- Understanding these mechanisms is crucial for optimizing strong-weak coupling outburst prevention technologies in mines.
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