Experimental Study on Shear-Seepage Coupling Characteristics of Single Fractured Rock Mass Under Cyclic Loading and Unloading

Yang, Tianjiao; Wang, Pengyu; Wang, Shuhong; Liu, Huan; Zhang, Ze

doi:10.1007/s00603-022-03125-x

Cited by 23 publications

(22 citation statements)

References 81 publications

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“…According to the test results, the pore size of the TS-RCR structure is divided as follows [38,39]: small pore size (r < 0.1 μm), medium pore size (0.1 μm < r < 1 μm), and large pore size (r > 1 μm). Te pores and cracks in the structural samples are assumed to be spherical or columnar-pipe.…”

Section: Structural Damage and Crack Evolutionmentioning

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: Structural Damage and Crack Evolutionmentioning

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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“…First, the deformation of a few pixel points is much greater than that of other pixel points. Second, these pixel points with large deformation are concentrated in one or a few connected bands (Yang et al 2018). In mathematical statistics, variance is a measure of the dispersion degree in a group of data.…”

Section: Dic and Variance Of The Deformation Fieldmentioning

confidence: 99%

Quantitative investigation on localized deformation process of rocks by uniaxial test and digital image correlation

et al. 2023

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The uniaxial monotonic and cyclic loading tests were carried out. The acoustic emission (AE) events and surface deformation images in the loading process were obtained using the AE system and digital image correlation (DIC). The variance of the deformation field was introduced to reveal the formation and evolution processes of the localized deformation. The results show that the variance begins to increase significantly in the initiation of the macro-scale failure stage, and it increases sharply under cyclic loading before failure. The shape of the stress-variance hysteresis curve varies with increasing upper limit stress, and four types of stress-variance hysteresis curves were revealed. The damage variables are respectively defined by cumulative AE counts and variance, and the evolution process of damage variable can be divided into crack closure stage, initial damage stage, stable development stage, accelerated development stage and failure stage. By proposing the differentiation rate, it is found that there are apparent failure precursor points under monotonic and cyclic loading.

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“…At present, the shallow mineral resources are decreasing or even depleting year by year, and the exploitation of metallic and non-metallic mineral resources is in the stage of comprehensive advancement to the deep part 1 . The mining 2 , 3 and blasting 4 , 5 processes in rock engineering, and the gas storage and production 6 processes in salt cavern engineering, are all subject to cyclic loads that deform the rock. Rocks are the basic components of engineering rock masses, and different engineering projects have different rock types.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission characteristics and energy evolution law of rock damage process of different pore structures under cyclic loading

Jiang,

Dang,

Chen

et al. 2024

Sci Rep

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The AE and damage characteristics of three types of pore-structured rock under the same working conditions are studied by means of uniaxial cyclic loading and unloading tests. The results suggest that with repeated loading and unloading, AE ringing increases as a “jump”, and the denser the structure, the earlier the “jump” occurs. The AE cumulative energy shows a “step” upward trend, but there is a significant difference in the “step” spacing. By comparing the energy distribution of rocks with different pore structures, it can be seen that the smaller the porosity and the smaller the pore size, the greater the energy input and storage, and the earlier the internal failure. Compared with the other two energy-based damage calculation methods, the damage calculation method defined in this paper is closer to the true internal damage level of the rock loading cycle. The NSE value of the modified damage variable calculation method was significantly improved and it was shown that the dissipated energy before pore compaction is the main energy causing damage, after pore compaction the combined effects of dissipated energy and plastic deformation energy result in rock damage.

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Experimental Study on Shear-Seepage Coupling Characteristics of Single Fractured Rock Mass Under Cyclic Loading and Unloading

Cited by 23 publications

References 81 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

Quantitative investigation on localized deformation process of rocks by uniaxial test and digital image correlation

Acoustic emission characteristics and energy evolution law of rock damage process of different pore structures under cyclic loading

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