Qiang Sun
Ministry of Land and Resources of the People's Republic of China
Magnetic fieldPhase transitionOil shaleTotal organic carbonComposite materialTransition pointMaterials scienceMineralogyQuartzMechanical failureRed sandstoneRock failureCoal fireThermal damagePore sizeUniaxial compressionPyrolysisAtmospheric temperature rangeOrganic matterStress–strain curveRadonArgonMechanicsThermogravimetric analysisPorosityStructural geologyStress (mechanics)Activation energyProcess (computing)
Publications 4
To better investigate the effect of high temperatures on the b-values of acoustic emissions (AEs), the fracturing of sandstone when subjected to uniaxial compression testing after different heat treatments is monitored by examining the AEs. The results show that the b-values are rapidly reduced around the yield stress and reduce to the lowest value at the peak stress during the loading process. After 550°C, the b-value of the yield stress of sandstone begins to decrease with temperature increase...
#1Pengfei Li (Xi'an University of Science and Technology)
#2Qiang Sun (Ministry of Land and Resources of the People's Republic of China)H-Index: 1
Last. Tian Yang (Xi'an University of Science and Technology)H-Index: 1
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High temperature and pore structure are important factors affecting the emission rate of radon in rocks. This study mainly focused on the correlation between radon emission rate and temperature in red sandstone. The results showed that in the temperature range of 25-400 °C, as the temperature increased, the connectivity of the internal pores of the sample became better, resulting in a significantly increased radon emission rate. The radon emission rate at 400 °C was 2.86 times the original. To e...
A set of thick, black organic shale is developed at the bottom of the Chang 7 accumulation, an important oil-producing section of the Triassic Yanchang Formation in Ordos Basin. In this paper, the thermogravimetric (TG) behaviour of different organic-rich shale layers is studied in an argon environment. Changes in activation energy (E) are analysed by the Coats-Redfern kinetic method, and thermodynamic characteristics at different temperature stages are clarified. The TG curve of Chang 7 shale d...
#1He Zhang (Xi'an University of Science and Technology)H-Index: 2
#2Qiang Sun (Xi'an University of Science and Technology)H-Index: 1
Last. Zhenlong Ge (Xi'an University of Science and Technology)H-Index: 1
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It is difficult to observe changes in the internal structure of natural rocks when under certain pressure ranges. However, such rocks have specific magnetic properties that are established during their formation process. Through studying changes in their magnetic properties while under pressure, which are readily observed and analyzed, as combined and contrasted with their associated structural changes, the relationship between the stress–strain and the magnetic field intensity can be establishe...
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