Study on the effect of the lower limit of cyclic stress on the mechanical properties and acoustic emission of sandstone under cyclic loading and unloading

Shen, Rongxi; Chen, Tongqing; Li, Taixun; Li, Hongru; Fan, Weijun; Hou, Zhenhai; Zhang, Xin

doi:10.1016/j.tafmec.2020.102661

Cited by 48 publications

(8 citation statements)

References 35 publications

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“…Cyclic loading and unloading parameters (waveform, amplitude, frequency, and upper and lower stress limits) have important effects on the deformation, mechanical properties and energy evolution of rock 16–19 . When the lower stress limit decreases, there is an increase in the equivalent residual strain and accumulated fatigue damage 20 . Meanwhile, when the upper stress limit and stress amplitude of cyclic loading increase, the accumulation of dissipated energy and fatigue damage of the rock also increase, resulting in a lower fatigue life 18,21 .…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19] When the lower stress limit decreases, there is an increase in the equivalent residual strain and accumulated fatigue damage. 20 Meanwhile, when the upper stress limit and stress amplitude of cyclic loading increase, the accumulation of dissipated energy and fatigue damage of the rock also increase, resulting in a lower fatigue life. 18,21 The essence of rock fatigue failure is the final result caused by the continuous initiation, expansion and coalescence of internal microcracks during the fatigue loading process.…”

Section: Introductionmentioning

confidence: 99%

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Crack evolution law and failure mode of red sandstone under fatigue–creep interaction

Shi

2021

Fatigue Fract Eng Mat Struct

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To explore the fracture characteristics of rock under the interaction of fatigue load and creep load, fatigue–creep interactive loading experiments were performed on red sandstone with prefabricated cracks. The crack evolution process and failure mode were analyzed using acoustic emission technology and digital image correlation. The results showed that crack growth mainly occurred in the fatigue loading stage; the crack evolution of the sample could be divided into three stages: nucleation and initiation ( SI), stable expansion ( SII), and unstable fracture ( SIII). There were distinct differences in the crack propagation modes of the rock samples with different prefabricated crack angles. The relationship between the crack initiation angle and prefabricated crack angle was analyzed based on the maximum circumferential stress theory. Moreover, with an increase in the prefabricated crack angle, the rock sample gradually changed from compression–shear failure to tension–shear failure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crack evolution law and failure mode of red sandstone under fatigue–creep interaction

Shi

2021

Fatigue Fract Eng Mat Struct

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“…The damage process of the specimen is relatively stable, and there is no significant load mutation characteristic, so the change in EP signals is relatively stable. When the load level is low, the specimen undergoes transverse expansion deformation under the action of axial stress, and the damage degree is higher [27]. In this process, the abundant EP signals are generated due to crack propagation and friction between crack surfaces, and the EP intensity increases with the increase in fracture surfaces.…”

Section: Test Results Of the Concrete Specimenmentioning

confidence: 99%

Experimental Test and Field Observations of an Electric Potential Monitoring Device for Dynamic Hazards during Mining Activities

Niu

Wang

et al. 2022

Minerals

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The EP (electric potential) signals can be generated during the deformation and fracture process of coal and rock mass. Meanwhile, the EP response is closely related to its stress state and damage evolution, which is expected to be used in monitoring and coal and rock dynamic disaster hazards. Based on this, this paper developed an EP monitoring device for mining to continuously monitor the temporal response characteristics and spatial distribution of coal seam internal EP signals in real time. Further, the experimental tests were carried out, whose results showed that the device has high monitoring sensitivity and little error for the EP signals and can reveal the loading state and damage degree of the coal and rock specimens during the deformation and fracture process. Moreover, the tests and application of EP monitoring were carried out during mining activities in the field. The results showed that the EP signals fluctuate during the coal mining stage and remain relatively stable during the maintenance stage. When the abnormal mining stress or the coal cannon phenomenon occurs, the intensity of EP signals increases rapidly and fluctuates violently, which has precursory response information for the hazards of dynamic disasters. Considering the advantages of sensitive response and nearly non-destructive monitoring, the study results can provide key monitoring equipment and research basis for field testing the EP signals during the mining process, to monitor and forecast the hazards of coal and rock dynamic disasters.

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“…In addition, the research on the mechanical response of rock under cyclic loading mainly focuses on the damage evolution law under constant stress amplitude, while the research on the mechanical response of rock under step cyclic loading of different stress paths is not deep and clear enough. In practical engineering, with the increase of working depth or the change of construction location, the cyclic load stress amplitude and stress lower limit of rock will change differently [15], and therefore, a further study to explore the influence of different stress paths on rock bearing capacity, deformation, and energy dissipation is necessary.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Cracked Rock in Cold Region Subjected to Step Cyclic Loading

et al. 2022

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In order to analyze the mechanical behavior of cracked rock in cold region subjected to cyclic loading, step cyclic loading and unloading (SCLU) triaxial tests with different stress paths have been designed. The mechanical responses such as strength, deformation, and failure mode were analyzed. The test results show that limestone has obvious strengthening effect under cyclic loading due to local crushing and filling of internal structural plane. The strengthening effect and fatigue damage effect caused by cyclic loading and the impact damage effect caused by the upgraded of stress level have an effect on mechanical response of cracked rock, and the degree of influence is related to the stress path. Under the stress path of constant stress lower limit (CSLL), the strengthening effect of rock was more prominent and its strength was enhanced. It was mainly subjected to progressive fatigue damage and had a buffering effect in the failure process. However, under the stress path of increasing the stress lower limit (ISLL), the rock suffered significant impact damage and entered the fatigue damage stage in advance, which led to its strength reduction and sudden failure when entering the next stress level. In addition, during the loading process, larger initial stress amplitudes led to more obvious cyclic strengthening effects, while smaller initial stress amplitudes led to greater plastic deformation and energy dissipation, and the rock was more prone to progressive damage.

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Study on the effect of the lower limit of cyclic stress on the mechanical properties and acoustic emission of sandstone under cyclic loading and unloading

Cited by 48 publications

References 35 publications

Crack evolution law and failure mode of red sandstone under fatigue–creep interaction

Crack evolution law and failure mode of red sandstone under fatigue–creep interaction

Experimental Test and Field Observations of an Electric Potential Monitoring Device for Dynamic Hazards during Mining Activities

Mechanical Behavior of Cracked Rock in Cold Region Subjected to Step Cyclic Loading

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