Influence of freeze-thaw cycles on dynamic compressive strength and energy distribution of soft rock specimen

Ma, Qinghai; Ma, Dongdong; Yao, Zhaoming

doi:10.1016/j.coldregions.2018.04.014

Cited by 102 publications

(37 citation statements)

References 22 publications

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“…where D p stands for damage variable calculated by variation of wave velocity, V n is the P-wave velocity after n H-T cycle numbers, and V 0 is the P-wave velocity of rock without H-C cycles. e other effective calculation method to describe the damage variable is based on the variation of dynamic strength [18], which can be calculated according to equation 3:…”

Section: Variation In Damage Using Damage Mechanics Methods To Studymentioning

confidence: 99%

“…Less research has concentrated on the study for the dynamic mechanical properties of weathered rock. Ma et al [18] investigate the effects of F-T cycles on dynamic compressive strength and energy distribution parameters for soft rock. Wang et al [19] compared the static and dynamic mechanical characteristic of red sandstone free from and after F-T or thermal shock (T-S) weathering.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hydrothermal Coupling on Physical and Dynamic Mechanical Properties of Sandstone

Zhang

Yuan

2019

Advances in Civil Engineering

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Split-Hopkinson pressure bar (SHPB) tests were conducted for sandstone after recurrent heat-cool (H-C) cycles. Physical and mechanical properties, damage, and fracture characteristics of sandstone after the H-C cycle were explored. Additionally, the damage variable and release rate of damage strain were defined to describe the damage degree of the sandstone specimen after recurrent H-C cycles. Finally, the relationship between mass fractal dimension of fragmentation and cycling number was discussed. Results show that the P-wave velocity and density decrease with the increase of cycling number, while the porosity increases. It was found that the dynamic compressive strength and relative elastic modulus decrease with the increase of cycling number. 20 cycles is the critical point for the low temperature (L-T) group and moderate temperature (M-T) group, while it is 4 cycles for the high temperature (H-T) group. With the increase of cycling number, both the damage variable and release rate of damage strain of rock increase, while the destruction degree of sandstone becomes greater, and the corresponding fragments show more evenly.

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Section: Variation In Damage Using Damage Mechanics Methods To Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Hydrothermal Coupling on Physical and Dynamic Mechanical Properties of Sandstone

Zhang

Yuan

2019

Advances in Civil Engineering

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“…e typical shaped waveform measured in SHPB test is shown in Figure 7. (ii) en, a series of impact tests are carried out to study the dynamic mechanical and fracture behavior of saturated yellow sandstone after F-T. During the impact test, the striker bar velocity is measured by a speedometer at di erent F-T temperatures; meanwhile, the strain rates of specimens are obtained using a three-wave method [27].…”

Section: Impact Experimental Equipment and Procedurementioning

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%

“…where σ I (t), σ R (t), and σ T (t) are the incident wave stress, re ected wave stress, and transmitted wave stress, respectively. e incident energy (W i ) caused by the impact between the incident bar and striker bar is mainly from four sources: the energy absorbed by the specimen, the energy re ected back into the incident bar, the energy propagated to the transmitted bar, and dissipated energy caused by the friction between the specimen and the bar, which accounts for a small proportion and can be ignored [27]. Hence, the dissipated energy (W L ) can be obtained by…”

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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Effects of Test Temperature and Low Temperature Thermal Cycling on the Dynamic Tensile Strength of Granitic Rocks

Mardoukhi

Hokka

et al. 2020

Rock Mech Rock Eng

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Influence of freeze-thaw cycles on dynamic compressive strength and energy distribution of soft rock specimen

Cited by 102 publications

References 22 publications

Effect of Hydrothermal Coupling on Physical and Dynamic Mechanical Properties of Sandstone

Effect of Hydrothermal Coupling on Physical and Dynamic Mechanical Properties of Sandstone

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

Effects of Test Temperature and Low Temperature Thermal Cycling on the Dynamic Tensile Strength of Granitic Rocks

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