Influence of Heating Rate on the Dynamic Mechanical Performance of Coal Measure Rocks

In this paper, the dynamic loading tests of sandstone after heat treatment at 25-800 °C are carried out by using the split Hopkinson pressure bar test system. Combined with the theory of energy dissipation, the dynamic fracture and energy consumption characteristics of coal-series sandstone are systematically studied. The test results illustrate that the dynamic fracture and energy consumption characteristics of sandstone are mainly related to the changes of internal moisture and cementing materials.

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“…Making use of the principle of stress wave, the energy expression form of sandstone impact damage can be written [8]:…”

Section: Calculation Methods Of Failure Energy Of Sandstonementioning

confidence: 99%

Dynamic fracture and energy consumption characteristics of coal-series sandstone after heat treatment

Lin

Mao

2019

THERM SCI

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“…In this work, we take the straight line slope of the stress-strain curve in elastic stage as the elastic modulus of the specimen. e methods have already been used in other papers [28]. Figure 11 depicts the relationship between the dynamic elastic modulus (E d ) and the F-T temperatures (T).…”

Section: In Uence Of F-t Temperature On Dynamic Mechanicalmentioning

confidence: 99%

“…To quantify the in uence of the F-T temperature on the fracture degree of the yellow sandstone, the particle size coe cient r is introduced to represent the average particle size of the specimen [28]:…”

Section: E Ect Of F-t Temperature On the Particle Sizementioning

confidence: 99%

“…Energy Dissipation Calculation. Based on the onedimensional stress wave theory and the uniform stress assumption [27], with the incident wave, re ected wave, and transmitted wave measured by the high dynamic strain indicator, the stress (σ(t)), strain (ε(t)), and strain rate (_ ε(t)) of the saturated yellow sandstone can be deduced through a three-wave analysis [28]:…”

Section: Influence Of F-t Temperature Onmentioning

confidence: 99%

“…E 0 , A 0 , and C 0 are Young's modulus, the cross-sectional area, and elastic longitudinal wave speed of the bar, respectively.A c Advances in Civil Engineering and l c are the cross-sectional area and height of specimens, respectively. en, the incident energy (W I ), re ected energy (W R ), and transmitted energy (W T ) of the yellow sandstone can be calculated [28] as follows:…”

Section: Influence Of F-t Temperature Onmentioning

confidence: 99%

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Experimental Investigation on Dynamic Fracture Mechanism and Energy Evolution of Saturated Yellow Sandstone under Different Freeze‐Thaw Temperatures

Chen

Mao

Yang

et al. 2019

Advances in Civil Engineering

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The coupling effect of freeze-thaw (F-T) temperature and dynamic load on the dynamic mechanical properties and fracture mechanism of saturated yellow sandstone was experimentally investigated in this research. The dynamic compression tests on the specimen after different F-T temperatures (i.e., −5°С, −10°С, −15°С, −20°С, −30°С, and 20°С) have been carried out with split-Hopkinson pressure bar (SHPB) setup under eight F-T cycle numbers. The density and P-wave velocity of the specimens were obtained before and after the F-T tests. After the F-T tests, the specimen microstructures were examined via the scanning electron microscope (SEM). The dynamic fracture process was visualized by the high-speed camera. The particle size distribution and fragment shapes of the specimens were analyzed using a classifying screen. In addition, the energy dissipation law of specimens during the impact test was also discussed. Experimental results show that the dynamic elastic modulus, strength of the specimen, and the average particle size decrease with decreasing F-T temperature. SEM results reveal that low F-T temperature leads to severer internal damage of the specimen by inducing freeze-swell holes, interconnected cracks, and pore clusters. In addition, the fragmentation shapes of the failed specimens exhibit double-cone failure, single-side slope failure, double-side slope failure, and split failure. The energy dissipation increases gradually with increasing F-T temperature. This study helps to prevent geological disasters and optimize engineering design in cold regions.

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Investigation of the Heat-Treatment Effect on Rock Fragmentation Characteristics Using the Dynamic Ball Compression Test

Yao

Wang

et al. 2020

Rock Mech Rock Eng

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Influence of Heating Rate on the Dynamic Mechanical Performance of Coal Measure Rocks

Cited by 33 publications

References 43 publications

Dynamic fracture and energy consumption characteristics of coal-series sandstone after heat treatment

Dynamic fracture and energy consumption characteristics of coal-series sandstone after heat treatment

Experimental Investigation on Dynamic Fracture Mechanism and Energy Evolution of Saturated Yellow Sandstone under Different Freeze‐Thaw Temperatures

Investigation of the Heat-Treatment Effect on Rock Fragmentation Characteristics Using the Dynamic Ball Compression Test

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