Electromagnetic radiation signal monitoring and multi-fractal analysis during uniaxial compression of water-bearing sandstone

Li, Hongru; Qiao, Yafei; Shen, Rongxi; He, Manchao

doi:10.1016/j.measurement.2022.111245

Cited by 41 publications

(22 citation statements)

References 44 publications

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“…Protected coal seams, roof, and foor are simplifed into a TS-RCR structure. When both rocks and coal are at the linear elastic stage, the equivalent elastic modulus E of the parts of rocks and coal in series can be calculated as follows [28][29][30][31][32][33]:…”

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Xie,

Chen,

Fang

et al. 2023

Advances in Civil Engineering

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Four representative TS-RCR (three-soft rock-coal-rock) structural bodies were selected according to the lithofacies analysis of coal measures in the Xiangshui Coal Mine, Guizhou, China, to analyze the mechanical properties, internal structure damage characteristics, and crack evolution law of the TS-RCR structural body composed of a soft roof, a soft floor, and soft coal seams. The mechanical model of the TS-RCR structural body was proposed. (1) The stress-strain curves of TS-RCR structures with different lithologies under cyclic loading and unloading show a change rule of sparsity, density, and sparsity with the increased cycles. The deformation of TS-RCR structures under cyclic loading and unloading can be divided into four stages. When the height ratio of the TS-RCR structural body was the same, the higher the strength of the upper and lower rocks, the more cycles the TS-RCR structural body had, and the denser the cyclic loading and unloading curve. On the contrary, the fewer cycles the TS-RCR structural body had, the sparser the cyclic loading and unloading curve. (2) The T2 (transverse relaxation time) spectrum curves of the structural bodies were monitored at about 1 and 10 ms, and two obvious peaks were detected, indicating micropores and mesopores with a large volume in the structural body. Signal intensity increased at the relaxation time of 1 ms, decreased at 10–100 ms, and increased slightly at 100–1000 ms. The pore structure of the structural body with different lithologies changed significantly with the increased cycle number. (3) The damage and failure process of the structural body was roughly divided into three periods according to the time-history analysis of acoustic-emission AF (the ratio of acoustic-emission ringing count to duration) of the structural body: the active period with a relatively low AF value (AF < 60 kHz) in the 1st-2nd cycles; the rising period with a relatively stable increase of the AF value in the 3rd-4th cycles; and the explosive period with a relatively high AF value (AF ≥ 60 kHz) in the 5th cycles. According to the relationship between the RA (the ratio of the rise time to the amplitude of the acoustic-emission-detection wave) value and time, the evolution law of the RA value and AF value of structures with different lithologies is similar in different periods under cyclic loading and unloading.

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Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Xie,

Chen,

Fang

et al. 2023

Advances in Civil Engineering

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“…The enhancement of underwater images usually uses existing image enhancement technologies to construct underwater image enhancement algorithms that conform to underwater scenes, and most of them are based on specific image degradation reasons [6][7][8]. Paulo Drews JR [9] based on the DCP algorithm, proposes a UDCP algorithm that uses the blue-green channel of the underwater image as the information source to improve the contrast of the underwater image.…”

Section: Introductionmentioning

confidence: 99%

Water quality monitoring and sustainable operation management of marine ranches based on sensors and image enhancement

Wang,

Guo,

Yang

2023

International Conference on Mechatronics and Intelligent Control (ICMIC 2023)

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“…The nonlinear mechanical behaviors of rock mainly include the nonlinearity of strength and the nonlinearity of the stress-strain curve. [12][13][14][15] Many constitutive models adopt the Mohr-Coulomb criterion and the Hoek-Brown criterion to simulate the increase of strength with confining pressure. [16][17][18] Compared with the Mohr-Coulomb criterion, the latter criterion can show the nonlinear growth of strength with confining pressure.…”

Section: Introductionmentioning

confidence: 99%

“…The nonlinear mechanical behaviors of rock mainly include the nonlinearity of strength and the nonlinearity of the stress‐strain curve 12–15 . Many constitutive models adopt the Mohr–Coulomb criterion and the Hoek–Brown criterion to simulate the increase of strength with confining pressure 16–18 .…”

Section: Introductionmentioning

confidence: 99%

Effect of rock nonlinear mechanical behavior on plastic zone around deeply buried tunnel: An efficient semi‐analytical solution

Xiao,

Qiao,

et al. 2023

Num Anal Meth Geomechanics

Self Cite

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Adopting the novel proposed unified strain‐hardening and strain‐softening (UHS) model and finite difference method, an efficient semi‐analytical solution is proposed to study the influence of the nonlinear behavior of rock on ground reaction. The proposed solution eliminates stress vibrations of the classical method that occurred in the strain‐hardening zone, because it judges the elastic or plastic state of the calculation nodes before calculating the ground reaction; compared with the iterative solution, the proposed solution avoids iteratively solving for the plastic internal variables at each calculated node, resulting in that its computational efficiency is improved by more than 10 times. The proposed solution was verified by comparing it with the iterative solution, and numerical solution. Moreover, the effects of initial yield strength, peak strength, residual strength, and supporting pressure on ground reaction after tunnel excavation are studied. The results show that increasing the initial yield strength and residual strength will obviously decrease the plastic zone (PZ) and sub‐zones. The peak strength of rock has limited influence on the radius of PZ, which mainly adjusts the ratio of each sub‐zone in PZ. In addition, increasing the support pressure is an effective means to control the radius of PZ and sub‐zones in deep buried tunnels.

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Electromagnetic radiation signal monitoring and multi-fractal analysis during uniaxial compression of water-bearing sandstone

Cited by 41 publications

References 44 publications

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Water quality monitoring and sustainable operation management of marine ranches based on sensors and image enhancement

Effect of rock nonlinear mechanical behavior on plastic zone around deeply buried tunnel: An efficient semi‐analytical solution

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