Effects of high temperatures on dynamic rock fracture

Zhang, Zong-Xian; Yu, Jian; Kou, Shaoquan; Lindqvist, Per-Arne

doi:10.1016/s1365-1609(00)00071-x

Cited by 130 publications

(46 citation statements)

References 12 publications

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“…Many experimental investigations have demonstrated that high temperature significantly affects the physical properties of sandstones (Heuze 1983;Glover et al 1995;Chopra 1997;Zhang et al 2001;Tang et al 2011;Zhao et al 2012). Analytical and numerical modeling of thermomechanical processes in sandstones have shown that variations in rock physical properties (such as bulk density, porosity, compressional wave velocity, etc.)…”

Section: Discussionmentioning

confidence: 99%

Strength Failure and Crack Evolution Behavior of Rock Materials Containing Pre-existing Fissures

Yang¹

2015

Springer Environmental Science and Engineering

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Section: Discussionmentioning

confidence: 99%

Strength Failure and Crack Evolution Behavior of Rock Materials Containing Pre-existing Fissures

Yang¹

2015

Springer Environmental Science and Engineering

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“…To study the dynamic damage and energy dissipation of sandstone after high temperature treatment, many experts and scholars have carried out a series of experiments and obtained the experimental results. Zhang et al [6] measured the dynamic fracture toughness of Fangshan gabbro and Fangshan marble subjected to high temperature by split Hopkinson pressure bar (SHPB) system. Liu and Xu [7,8] carried out the dynamic mechanical experiments on marble under different temperature and different strain rates by using the high temperature split Hopkinson pressure bar (SHPB) experimental system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Zhang

Jing

2018

Shock and Vibration

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Thermal damage and energy evolution characteristics in process of impact failure of sandstone after high temperature treatment were studied by split Hopkinson pressure bar (SHPB) system. The ultrasonic P-wave velocity, density, porosity, peak stress, / 0 , thermal damage, fracture, and energy evolution characteristics of sandstone with temperature during the experimental process were explored. Results show that, with the increase of temperature, the ultrasonic P-wave velocity and density decrease, while the porosity increases. It is found that the peak stress and / 0 decrease with the increase of temperature, and the decreasing trend is fitted with the simple cubic equation. Above 600 ∘ C, dynamic peak stress and / 0 decrease rapidly. The thermal damage of rock increases with the increase of temperature, which is in accordance with the logistic curve model. The thresholds of damage strain energy release rate are 200 ∘ C and 800 ∘ C in this research. Its total input strain energy decreases with the increase of processing temperature and decreases sharply when the temperature is over 600 ∘ C. The variation of total input strain energy has small change at the range from 400 ∘ C to 600 ∘ C.

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“…By testing the dynamic fracture toughness of gabbro and marble that had undergone heat treatments in high temperatures, Zhang et al [16] discovered that the dynamic fracture toughness of both rocks increased in increments as the strain rate rose; however, they remained basically stable throughout heat treatment processes. Yin et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heating Rate on the Dynamic Tensile Mechanical Properties of Coal Sandstone during Thermal Treatment

Mao

et al. 2017

Shock and Vibration

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The effects of coal layered combustion and the heat injection rate on adjacent rock were examined in the process of underground coal gasification and coal-bed methane mining. Dynamic Brazilian disk tests were conducted on coal sandstone at 800 ∘ C and slow cooling from different heating rates by means of a Split Hopkinson Pressure Bar (SHPB) test system. It was discovered that thermal conditions had significant effects on the physical and mechanical properties of the sandstone including longitudinal wave velocity, density, and dynamic linear tensile strength; as the heating rates increased, the thermal expansion of the sandstone was enhanced and the damage degree increased. Compared with sandstone at ambient temperature, the fracture process of heat-treated sandstone was more complicated. After thermal treatment, the specimen had a large crack in the center and cracks on both sides caused by loading; the original cracks grew and mineral particle cracks, internal pore geometry, and other defects gradually appeared. With increasing heating rates, the microscopic fracture mode transformed from ductile fracture to subbrittle fracture. It was concluded that changes in the macroscopic mechanical properties of the sandstone were result from changes in the composition and microstructure.

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Effects of high temperatures on dynamic rock fracture

Cited by 130 publications

References 12 publications

Strength Failure and Crack Evolution Behavior of Rock Materials Containing Pre-existing Fissures

Strength Failure and Crack Evolution Behavior of Rock Materials Containing Pre-existing Fissures

Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Effects of Heating Rate on the Dynamic Tensile Mechanical Properties of Coal Sandstone during Thermal Treatment

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