To study the dynamics characteristics of triaxial coal mass under impact load, the triaxial separated hopkinson pressure bar (SHPB) experiment system was built, and the dynamic impact tests were carried out under the random combination of axial static load, confining pressure and impact load. The dynamics characteristics at these conditions were studied. The experimental results showed that there was no compaction stage in the dynamic stress-strain curves of triaxial coal under impact load. The ...
Low-grade coal is difficult to obtain high efficiency by conventional flotation due to its poor surface hydrophobicity.In addition,the reactivity between low-grade coal and oxygen is high,so it is prone to spontaneous combustion.However,there is less oxygen in coal bed or internal dump,so the coal mainly suffers high temperature baking(similar to low temperature pyrolysis environment).Low temperature pyrolysis has gradually become one of the ways of efficient transformation and utilization of lo...
In order to study the effect of soaking on coal spontaneous combustion,the coal samples with different ranks were selected,and the FT-IR and thermos-gravimetric experiments were carried out on the same moisture content of raw coal and soaked coal.Compared the Infrared Spectra,it is found that the active groups in the soaked coal increase and the oxidation activity is higher than that of raw coal.Based on the TG curves and the theory of ignition activation energy of coal spontaneous combustion,th...
#1Sui Li-l(CUMT: China University of Mining and Technology)H-Index: 1
To study the shale gas optimal exploitation method in Dongying subsidence area,this paper extracted 13 groups of shale cores with different buried depths( 3 315. 85- 3 485. 07 m) from the upper Es4 to lower Es3 at Dongying subsidence area in Shengli oilfield. Authors measured and analyzed five physical mechanical fracability related parameters,the results of five parameters show that the shale in Dongying subsidence area has a good exploration prospect. According to the longitudinal comparative ...
The paper analyzed the damage situation caused by coal mining at Yushenfu coal mining area by field survey and remote sensing interpretation. The study results show: 1 802( group) fissures and 95 ground subsidence have been caused by coal mining since 1993 within a total area 94. 47 km2; The distribution of ground fissures on the surface has significant zonation. Ground fissures are intensive,and seriously damage the topography at the loess donga region,however,due to their partial closure,the s...
The fitting precision of theoretical variogram is unstable for the Kriging interpolation method,and there is lack of special potential nephogram software for coal and rock failure process. To overcome the problem above,an automatic-manual fitting method was proposed to calculate theoretical variogram model parameters in Kriging interpolation method,and a surface potential nephogram software for coal and rock failure process was developed by using MATLAB. The software was used to draw surface pot...
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