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Failure evolution and disaster prediction of rock under uniaxial compression based on non-extensive statistical analysis of electric potential

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International Journal of Mining Science and Technology 2024年第7期34卷 975-993页

作者： Tiancheng Shan Zhonghui Li Haishan Jia Enyuan Wang Xiaoran Wang Yue Niu Xin Zhang Dong Chen Shan Yin Quancong Zhang State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China

rock failure can cause serious geological disasters,and the non-extensive statistical features of electric potential(EP)are expected to provide valuable information for disaster *** this paper,the uniaxial compression experiments with EP monitoring were carried out on fine sandstone,marble and granite samples under four displacement *** Tsallis entropy q value of EPs is used to analyze the selforganization evolution of rock *** the influence of displacement rate and rock type on q value are explored by mineral structure and fracture modes.A self-organized critical prediction method with q value is *** results show that the probability density function(PDF)of EPs follows the q-Gaussian *** displacement rate is positively correlated with q *** the displacement rate increasing,the fracture mode changes,the damage degree intensifies,and the microcrack network becomes *** influence of rock type on q value is related to the burst intensity of energy release and the crack fracture *** q value of EPs can be used as an effective prediction index for rock failure like b value of acoustic emission(AE).The results provide useful reference and method for the monitoring and early warning of geological disasters.

关键词： Electric potential Non-extensive statistical feature Displacement rate q-Gaussian distribution Precursor prediction rock materials

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A waveform modification method for testing dynamic properties of rock under high temperature

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Journal of rock Mechanics and Geotechnical Engineering 2021年第4期13卷 833-844页

作者： Tubing Yin Chao Wang You Wu Bingqiang Wu School of Resources and Safety Engineering Central South UniversityChangsha410083China

In this study,a waveform modification method was proposed using a self-designed heating device combined with the split Hopkinson pressure bar(SHPB)technique for determination of dynamic behaviors of rock at high ***,the temperature gradient distribution on the incident bar was measured according to the variation of elastic modulus of the bar with temperature,and the relationship between the longitudinal wave velocity and temperature of the bar was obtained based on onedimensional stress wave *** incident bar with a temperature gradient was divided into a series of microelements,and then the transmission coefficient of the whole incident bar was ***,the stress wave was modified by the transmission coefficient from 25℃ to 600℃.This method was used to study the dynamic properties of rock at high temperature,which not only preserves a classical SHPB device,but also effectively ensures the accuracy of the experimental results.A dynamic Brazilian disc experiment was carried out to explore the influences of loading rate and temperature on dynamic tensile strength of sandstone at high temperature using the proposed waveform modification method.

关键词： High temperature Split Hopkinson pressure bar(SHPB) Dynamic loading rock materials Mechanical properties

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Strain field investigation of limestone specimen under uniaxial compression loads using particle image velocimetry

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Journal of Central South University 2011年第5期18卷 1619-1625页

作者：徐金明程昌宏陆海平 Department of Civil Engineering Shanghai University Hunan Zhongda Design Institute Company Limited Central South University

The particle image velocimetry (PIV) method was used to investigate the full-field displacements and strains of the limestone specimen under external loads from the video images captured during the laboratory *** original colorful video images and experimental data were obtained from the uniaxial compression test of a *** eliminate perspective errors and lens distortion,the camera was placed normal to the rock specimen *** converted into a readable format of frame images,these videos were transformed into the responding grayscale images,and the frame images were then *** full-field displacement field was obtained by using the PIV technique,and interpolated in the sub-pixel *** displacement was measured in the plane of the image and inferred from two consecutive *** local displacement vectors were calculated for small sub-windows of the images by means of *** video images were interrogated in a multi-pass way,starting off with 64×64 images,ending with 16×16 images after 6 iterations,and using 75% overlap of the *** order to remove spurious vectors,the displacements were filtered using four filters:signal-to-noise ratio filter,peak height filter,global filter and local *** cubic interpolation was utilized if the displacements without a number were *** full-field strain was then obtained using the local least square method from the discrete *** strain change with time at different locations was also *** is found that the normal strains are dependant on the locations and the crack *** 1.0 and 5.0 s prior to the specimen failure,normal strains increase rapidly at many locations,while a stable status appears at some *** the specimen is in a failure status,a large rotation occurs and it increases in the inverse *** strain concentration bands do not completely develop into the large cracks,and meso-cracks are n

关键词： rock materials limestone video image strain field uniaxial compression particle image velocimetry

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