Fracture and Damage Evolution of Multiple-Fractured Rock-like Material Subjected to Compression

Liu, Taoying; Cui, Mengyuan; Li, Qing; Yang, Sen; Yu, Zhanfu; Sheng, Yeshan; Cao, Ping; ZHOU, Ke-ping

doi:10.3390/ma15124326

Cited by 6 publications

(7 citation statements)

References 34 publications

(40 reference statements)

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“…The failure characteristics are presented as the final evolution state of internal microcracks. The failure characteristics contain rich information, such as sample deformation and force transmission path [ 30 , 31 , 32 , 33 ]. Therefore, it is of great significance to analyze them.…”

Section: Mechanical Properties Analysismentioning

confidence: 99%

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Guo

Feng

et al. 2022

Materials

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In order to study the weakening mechanism and mechanical behaviors of hard lamprophyre of Carboniferous Permian coal-bearing strata in China’s mining area, lamprophyre samples were subjected to static rock dissolution experiments with pH values of 0, 2, and 4. The acid corrosion mechanism of lamprophyre was revealed from the weight changes of samples, characteristics of solution ion concentration, and macro-mechanical properties. The experimental results show that reaction occurred between lamprophyre and acid solution. With the increasing concentration of H+, the reaction was more intense, the degree of acid etching was higher, and the weight loss was greater. The internal damage induced by acid etching results in the slow extension of the compaction stage of stress–strain curve of uniaxial compression, and the obvious deterioration of mechanical properties of the lamprophyre. The uniaxial compressive strength of the lamprophyre in the dry state is 132 MPa, which decreased to 39 MPa under the acid etching condition, showing significant mudding characteristics. Dolomite (CaMg(CO3)2 with 19.63%) and orthoclase (KAlSi3O8 with 31.4%) in lamprophyre are the major minerals constituents involved in acidification reaction. Photomicrograph recorded from SEM studies reveals that the dissolution effect was directly related to the concentration of H+ in the solution. The dissolution effect was from the surface to the inside. The small dissolution pores became larger and continuously expanded, then finally formed a skeleton structure dominated by quartz. The content of K+, Ca2+, and Mg2+ in the solution after acid etching reaction indicates that the acidified product of orthoclase is colloidal H2SiO3, which adhered to the surface of samples during acid etching and hinders the further acidification of minerals. The dissolution of dolomite and orthoclase under acidic conditions directly leads to the damage of their structure and further promotes the water–rock interaction, which is the fundamental reason for the weakening of the mechanical properties of lamprophyre.

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Section: Mechanical Properties Analysismentioning

confidence: 99%

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Guo

Feng

et al. 2022

Materials

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“…The larger the pre-crack angle (within the range of 30-60 degrees), the higher the compressive strength. Liu et al 52 proposed a mechanical model of multi-crack rock mass, and pointed out that the strength of multi-crack specimens decreases rst and then increases with the increase of crack inclination angle, and decreases with the increase of crack distribution density.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on strength and failure characteristics of mortar specimens with prefabricated cracks under uniaxial and triaxial stress

Pan

Wan

Jiang

et al. 2023

Preprint

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Cracks in rock mass have adverse effects on its mechanical characteristics and the stability of rock mass engineering. In this paper, cement mortar is used to make specimens with prefabricated cracks with different dip angles, and uniaxial compression, true triaxial compression and true triaxial unloading tests are carried out. The stress-strain curves under uniaxial compression and true triaxial compression have 4 and 5 stages, respectively. The strength of the specimen is the lowest as the dip angle of the crack is 45 °. Under uniaxial compression, the failure mode is mainly tensile failure, accompanied by a few shear cracks. With the increase of the crack dip angle of the specimen, the types of cracks generated at the tip of the prefabricated crack increase and change from shear crack to tensile crack. The distance between the crack tip and the loading end affects the failure degree of the specimen. Under true triaxial compression, the confining pressure significantly improves the strength and deformation characteristics of the specimen, and weakens the influence of the crack dip angle on the strength. The failure mode as a crack dip angle of 15 ° is mainly tensile, accompanied by tensile-shear composite and shear. The failure mode as crack dip angles of 45 ° and 75 ° is mainly tensile-shear composite, accompanied by tensile failure and shear failure. With the increase of the crack dip angle, the surface spalling of the specimen is more obvious, and the damage degree of the specimen is more severe. Under the triaxial unloading confining, the failure mode is mainly shear, accompanied by tensile and tensile-shear composite, more than two shear cracks through the top and bottom of the specimen lead to the failure. Compared with uniaxial compression, the damage degree of specimen is more severe under true triaxial compression and true triaxial unloading.

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“…Zhang et al (2020) combined with the theory of frost heaving mechanics and fracture mechanics, carried out the freeze-thaw cycle test, and analyzed failure modes and mechanical characteristics of crack growth. Li et al (2022) analyzed the influence of prefabricated crack angles on the mechanical properties and failure modes of coal samples under uniaxial compression. The geometric parameters of the joints in the rock mass (such as the occurrence, length, roughness, connectivity, filling, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Xi et al (2020) indicated that crack initiation and propagation will occur when the stress is far less than the compressive strength of the rock for granite specimens with prefabricated cracks. Liu et al (2022) proposed a mechanical model of multi-cracked rock masses and noted that the strength of multi-cracked specimens decreases first and then increases with the increase in the crack inclination angle. Tiwari and Rao (2006) studied the influence of joint morphology on strain hardening and softening and the plastic behavior of rock masses with triaxial and true triaxial compression tests.…”

Section: Introductionmentioning

confidence: 99%

“…Chen et al (2022) analyzed the response characteristics of AEs during crack propagation. Li et al (2022) analyzed the influence of the prefabricated crack angle on the AE response of coal samples under uniaxial compression. Gao et al (2023) monitored the mechanical behavior of red sandstone via two analyses that were conducted by using AE technology.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on strength and failure characteristics of mortar specimens with prefabricated cracks under uniaxial and triaxial stress

Pan,

Wan,

Jiang

et al. 2023

Front. Mater.

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Cracks in rock masses have adverse effects on their mechanical characteristics and the stability of rock mass engineering. For this experiment, uniaxial compression and true triaxial compression unloading tests were conducted on mortar specimens. The strength of the specimens was the lowest when the dip angle of the crack was 45°. Under uniaxial compression, the failure mode was mainly tensile failure. With an increase in the crack dip angle of the specimens, the types of cracks changed from shear to tensile cracks. Under true triaxial compression, the confining pressure considerably increased the strength and deformation characteristics of the specimens and weakened the influence of the crack dip angle on the strength. The failure mode when the crack dip angle was 15° was mainly tensile. The failure mode when the crack dip angles were 45° and 75° was mainly tensile–shear composite. With the increase in the crack dip angle, the failure degree of the specimens was more severe. Under the triaxial unloading confining, the failure mode was mainly shear. Compared with uniaxial compression, the failure degree of the specimens was more severe under true triaxial compression and true triaxial unloading. The innovation of this experiment is the use of a special mold to prepare specimens. We recommend that scholars conduct experimental and numerical simulation studies on different crack geometries.

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Fracture and Damage Evolution of Multiple-Fractured Rock-like Material Subjected to Compression

Cited by 6 publications

References 34 publications

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre

Experimental study on strength and failure characteristics of mortar specimens with prefabricated cracks under uniaxial and triaxial stress

Experimental study on strength and failure characteristics of mortar specimens with prefabricated cracks under uniaxial and triaxial stress

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