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Residual Stresses01:26

Residual Stresses

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Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
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Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
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Plastic Behavior01:21

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Creep in Concrete

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Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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Quarrying of Stone01:15

Quarrying of Stone

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Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
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Related Experiment Video

Updated: Jun 12, 2025

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
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Effect of super-high water materials backfilling on stress decrease and energy release during strip coal pillar

Keke Xing1,2, Jingyi Cheng1, Zheng Zhen1

  • 1School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.

Heliyon
|September 23, 2024
PubMed
Summary

Super-high-water backfilling effectively mines deep isolated coal pillars, reducing stress and energy release. This technology mitigates rock burst risks and shows significant promise for resource-exhausted mines.

Keywords:
Backfilling body stressBackfilling miningMicroseismic activityStrip coal pillar

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Area of Science:

  • Mining Engineering
  • Geotechnical Engineering
  • Resource Recovery

Background:

  • Strip coal pillar mining is crucial for resource-exhausted mines in eastern China.
  • Traditional backfilling methods face challenges with super-high water content materials in deep pillar mining due to strength and durability issues.

Purpose of the Study:

  • To investigate the feasibility and effectiveness of super-high-water backfilling technology for mining deep isolated coal pillars.
  • To assess the impact of this technology on stress, energy release, and rock burst risk.

Main Methods:

  • Theoretical analysis
  • Numerical simulation
  • Field monitoring
  • Engineering case study of panel c8301

Main Results:

  • Super-high-water filling significantly reduced peak stress by 29.6% and elastic energy by 51.5% compared to caving.
  • Mining panel c8301 with this method decreased microseisms and released energy, mitigating rock burst risks.
  • Field monitoring confirmed reduced seismic activity and energy release, validating the technology's effectiveness.

Conclusions:

  • Super-high-water backfilling technology is a viable and effective method for mining deep isolated coal pillars.
  • The technology demonstrates significant potential for application in resource-exhausted coal mines, improving safety and resource recovery.