#1Qiang Sun(CAS: Chinese Academy of Sciences)H-Index: 4
#2Shuyun Zhu(CUMT: China University of Mining and Technology)H-Index: 5
Last. Lei Xue(CAS: Chinese Academy of Sciences)H-Index: 9
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This paper reports the relationship between electrical resistivity and rock failure during uniaxial compression. Experiments of rock samples on an electro-hydraulic servo-controlled testing machine show that the variation of electrical resistivity is closely related to rock deformation. Near to rock fracture, microcracks appear and change the microstructure of rock mass, causing the rupture of mineral crystal lattice, and the electrical resistivity has a rapid variation with the growth of cracks...
Last. J.C. Alarcón(University of Alicante)H-Index: 1
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This work has been funded by the Universidad de Alicante under the projects uausti11-11, VIGROB-212 and gre09-40 and by the Generalitat Valenciana under the project gv/2011/044.
#1You-Liang Chen(USST: University of Shanghai for Science and Technology)H-Index: 10
#2Jing Ni(USST: University of Shanghai for Science and Technology)H-Index: 10
Last. Rafig Azzam(RWTH Aachen University)H-Index: 21
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► As the heating temperature increases, the peak stress and elastic modulus of heated granite decreases, while the peak strain increases. ► For a heating temperature below 400°C, the effect of temperature on peak stress, elastic modulus, and peak strain of granite is relatively small. ► When the heating temperature is below 400°C, the fatigue life can be considered to depend only on the values of σ m (T)/σ f (T) and σ a (T)/σ f (T). When the temperature is over 400°C, the fatigue life decreases ...
#1Zhao Hongbao(CUMT: China University of Mining and Technology)H-Index: 1
#2Chen Lun-jian(CUMT: China University of Mining and Technology)H-Index: 2
Taking limestone for research objects,the thermal expansion property is studied under high temperature;the porosity,ultrasonic wave velocity and elemental composition are studied in order to find out the reason caused thermal expansion.The results show that: the limestone produces thermal expansion under high temperature;the curves between thermal expansion and test time includes four steps,size of thermal expansion is determined by temperature;and the relation is nonlinear;the porosity increase...
Underground coal gasification (UCG) opens up the prospect of accessing trillions of tonnes of otherwise unmineable coal. When combined with carbon capture and storage (CCS), UCG offers some attractive new low-carbon solutions on a vast scale. This paper has several aims: to review key developments in technologies for UCG, CCS and CO2 storage in coal seam voids; to quantify the scale of the opportunity that these technologies open up; to examine the scope for linking these developments to other m...
#1Jin Chun-hua(CUMT: China University of Mining and Technology)H-Index: 1
Mechanical characteristics and micropore structure of granite under high-temperature (from normal to 1 300 ℃) have been researched with hydraulic servo system MTS 815 and micropore structure analyzer 9310. The results are as follows:① Mechanical characteristics do not show obvious variations below 800 ℃; strength decreases suddenly above 800 ℃ and bearing capacity is almost lost at 1 200 ℃. ② Rock porosity increases with rising temperatures; the threshold temperature is about 800 ℃; at this temp...
Last. S. Caran(Süleyman Demirel University)H-Index: 1
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Abstract The effect of thermal damage on the physical properties of five carbonate rocks has been investigated. The tests were conducted on two marbles and three limestones, mainly composed of calcite but with different grain sizes, porosities, structural and textural characteristics. Cubic samples prepared from these rocks were gradually heated to a specific temperature level of 100, 200, 300, 400 and 500 °C, and gradually cooled down to room temperature without causing thermal shock in order t...
#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...
Abstract The thermal damage evolution of rock closely relates to many important scientific and engineering problems, such as the mechanisms of earthquake and the effective extraction of deep geothermal energy. However, there is lack of rational thermal damage evolution model, and the mechanisms of thermal damage are still unclear especially during cooling. By use of a specially designed acoustic emission (AE) test system, we explored the thermal damage evaluation in a rock and established a ther...
Complex geological processes form multiple layers and change pore water chemistry, saturation level, and temperature. Eventually, the strata hinder interpreting electrical resistivity data. There are no studies that theoretically explore the effects of electrode geometries and multiple layered systems on laboratory electrical resistivity measurements. This study formulates a theoretical electrical resistance between half spherical-tipped cylindrical electrodes embedded on two horizontal layers. ...
In complex rock engineering, understanding the stress state and determining stability and damage evolution are necessary. To more accurately provide a theoretical basis for judging the stress state of bedrock in engineering, this study experimentally addressed the damage evolution of sandstone under loading and unloading conditions. A theoretical relationship between rock resistivity and porosity was obtained according to the Archie formula, which allowed the derivation of the sandstone damage v...
