Qiang Sun
Xi'an University of Science and Technology
Surface roughnessGeothermal gradientUltimate tensile strengthGeologyWettingBrittlenessDeformation (engineering)Soil scienceComposite materialAcoustic emissionThermal shockLoessMetallurgyMaterials scienceMineralogyChromaticityThermalVolume (thermodynamics)Water contentFractal dimensionSalt (chemistry)FeldsparQuartzKaoliniteCritical thresholdThermal damagePore diameterEastern chinaCompressive strengthAtmospheric temperature rangeRock mass classificationSubductionFrost heavingPorosityElectrical resistivity and conductivityP-waveSurface finishGroundwaterStress (mechanics)Degree (temperature)Thermal conductivityFracture toughnessRock mechanics
33Publications
5H-index
94Citations
Publications 33
Newest
During the underground coal gasification process, a large amount of heat will be released, causing the surrounding rock in the goaf to undergo a high-temperature baking process. Therefore, it is essential to study the pyrolysis characteristics and mechanism of rocks. In this paper, the red sandstone in Linyi city of China is taken as an example. According to the results of thermogravimetric analysis in argon and air, the thermokinetic parameters are calculated by non isothermal pyrolysis kinetic...
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#1Zhenlong Ge (Xi'an University of Science and Technology)H-Index: 1
#2Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
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Abstract null null Liquid nitrogen (LN2) ultra-low temperature fracturing technology has broad application prospects in the storage and transformation of geothermal wells. Therefore, it is of great significance to investigate the fracture toughness of granite samples after elevated temperature treatment and LN2 cooling. In this paper, the Cracked Straight Through Brazilian Disc (CSTBD) granite specimen was heat-treated at different temperatures to study the mode-I fracture toughness of granite a...
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#1Zhenlong Ge (Xi'an University of Science and Technology)H-Index: 1
#2Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
Last. He Zhang (Xi'an University of Science and Technology)H-Index: 2
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The mechanical properties of rock deteriorate at high temperatures, affecting the stability of the rock. Therefore, it is of great importance to predict the failure of rock at high temperatures. Through the uniaxial compression test, the acoustic emission (AE) characteristics of limestone during loading after being submitted to different heat treatment temperatures were studied, and the variation of the limestone b-value with temperature was discussed. The results show that the characteristics o...
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#1Shaofei Wang (Ontario Ministry of Natural Resources)
#2Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
Last. He Zhang (Xi'an University of Science and Technology)
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Spontaneous combustion of coal seams can produce very high temperature (generally between 600 and 850 °C, even reach to 1000 °C), which greatly changes the properties of the surface loess layer, such as its magnetic susceptibility and chromaticity. In order to study a fast, effective and nondestructive method to determine the influence range of coal seam spontaneous combustion zone, and to provide important clues for the development and utilization of coal seam and burnt rock, the mass-specific ...
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#1He Zhang (Xi'an University of Science and Technology)
#2Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
Last. Hailiang Jia (Xi'an University of Science and Technology)
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High-temperature baked sandstone is widely distributed in the north of Shaanxi, China. The lithology of these rocks has a significant impact on the mining of underground resources such as coal. To understand changes in its physical properties after heat treatment, yellow sandstone was heated for two hour at a constant temperature of 25, 800, 1000, 1100 or 1250 °C. Data on the glossiness, hardness and colour brightness, and surface micrographs, were obtained to study the relationship between surf...
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#2Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
Last. Tao LuoH-Index: 1
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Water-bearing porous rocks can be greatly strengthened by freezing; its microscopic mechanisms lie in how subzero temperature modifies pore structure but have not yet been clearly defined. In this study, we link the mechanical properties of frozen sandstone to phase composition of pore water (i.e., relative amount of unfrozen water and ice). Both the strength (uniaxial compressive strength and tensile strength) and the phase composition of pore water (tested through the nuclear magnetic resonanc...
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#1Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
#1Qiang Sun (Xi'an University of Science and Technology)
Last. He Zhang (Xi'an University of Science and Technology)
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Malan loess is a common engineering geological material in Northwest China, which is often used in many engineering constructions. In this paper, the electrical properties of loess under high temperature environment are studied, which provides theoretical basis for engineering construction. The remolded loess samples are heated by different temperatures between 25 and 900 °C under laboratory conditions. Then, the surface features and electrical properties are measured and analyzed. The major fin...
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#1He Zhang (Xi'an University of Science and Technology)H-Index: 2
#2Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
Last. Tao LuoH-Index: 1
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High temperatures affect the physical properties of red sandstone seriously, especially the pores. Understanding its mechanism is of great significance in coal mining following underground gasification, geothermal energy utilization, and the deep burial of nuclear waste. Nuclear magnetic resonance (NMR) was used to detect pore structure characteristics, and scanning electron microscopy (SEM) and polarizing light microscopy (PLM) were used to mechanism of change. The transverse relaxation time (T...
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#1X. Yang (CUMT: China University of Mining and Technology)
#2L. Cao (CUMT: China University of Mining and Technology)
Last. Qiang Sun (Xi'an University of Science and Technology)H-Index: 5
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The microstructure and appearance of sandstone samples from the bank slope of the Three Gorges Reservoir of the Yangtze River in Wanzhou District, Chongqing, China were evaluated before and after w...
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