Numerical simulation of direct shear test of rockfill based on particle breaking

Xu, Yongfu

doi:10.1007/s11440-021-01172-2

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…In the process of triaxial shear, particles near the shear zone, where the corresponding failure occurs in the sample, will have sliding, biting, and friction effects, 39 and crushing phenomenon may also occur at the sharp corners of the particles under a large confining pressure 40 . These factors explain the shear strength.…”

Section: Strength Degradation Mechanism Of Fsrm Under Temperature Risementioning

confidence: 99%

Mechanism of strength degradation of frozen soil–rock mixture under temperature rise‐induced particle ice film ablation

Tang

Zheng

et al. 2023

Permafrost & Periglacial

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The mesoscale effect of climate change and engineering activities on a superficial frozen soil–rock mixture (FSRM) in regions is complex. The decrease in strength caused by particle ice film ablation under temperature rise has various effects, such as upper subgrade settlement deformation. However, the internal mechanism of FSRM strength degradation remains unclear. Triaxial and nuclear magnetic resonance tests on FSRM were performed at various temperatures to clarify the mechanism of FSRM internal degradation. The results show that the strength, cohesion, and internal friction angle of FSRM decrease with increasing temperature, and the attenuation is significant in the range of −5 to 0°C. The change in ice–water content can be divided into three stages (i.e., freezing, phase transformation, and complete melting). In the three stages, the maximum free water is only 24%, while the maximum bound water is 100% above 0°C. Based on the microscopic test results, a mesoscopic calculation model for FSRM particles was developed. It was found that the work between particles is consistent with the law of strength degradation, and the friction function by particles gradually changes to bite work with increasing temperature. By introducing the strain energy theory, the strain energy generated by particle shear work is considered the key index to reflect FSRM strength. The particle ice film locking effect is weakened under temperature rise, and the increase in water weakens the strain energy generated by the work of the bite friction between particles during the shear process. At the macro level, the strength of FSRM deteriorates.

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Section: Strength Degradation Mechanism Of Fsrm Under Temperature Risementioning

confidence: 99%

Mechanism of strength degradation of frozen soil–rock mixture under temperature rise‐induced particle ice film ablation

Tang

Zheng

et al. 2023

Permafrost & Periglacial

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“…The key of particle flow code (PFC) to simulate the mechanical behavior of materials is to generate the initial model (Zhang et al, 2021;Xu and Xu, 2021;. First, the PFC servo system is used to adjust the packing density, size, and contact precision of the model particles to the ideal state and make them in the state of force equilibrium (Tian et al, 2021;Sarfarazi et al, 2021).…”

Section: Physical and Mechanical Parameters Of The Rockmentioning

confidence: 99%

Research on Deformation and Fracture Characteristics of the Fractured Rock Mass Under Coupling of Heavy Rainfall Infiltration and Mining Unloading

Wang

Shuang-suo

et al. 2022

Front. Earth Sci.

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The present study used PFC numerical software to examine the mechanical properties and fracture propagation characteristics of the fractured rock mass under coupling of heavy rainfall infiltration and mining unloading. Based on the engineering background of the Dexing mine, the pore water pressure is set to 0, 0.5, 1.0, 1.5, and 2.0 mpa, the true triaxial lateral unloading rate is 0.3 mpa/level and 0.6 mpa/level, and the water content state of rock is dry, natural, and saturated. Then, the true triaxial compression numerical simulation test is carried out, and the results showed that with the increase of the water content, the rock compaction stage increases, the elastic stage shortens, and the yield stage becomes more obvious. The faster the unloading rate is, the greater the influence on the rock strain is. After unloading, the stress jump point appears and the strain increase rate becomes larger, the volume of the rock increases and occurs as large s in the unloading direction, and finally it leads to severe brittle failure of the rock. With the increase of rock pore water pressure, the compressive strength and the peak strain of the rock decrease, and the pore water pressure accelerates the process of rock failure.

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“…At the deep seabed with high confining pressure, grain breakage process is an interesting phenomenon, which has attracted much attention 21–24 . Some numerical simulations are carried out to study the grain breakage process and its effects on localized deformation bands formation 25–33 . For example, Ip and Borja proposed a framework for modeling breakage process during compaction band formation by coupling a phase‐field approach with modified Cam‐Clay plasticity and breakage mechanics 30 .…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] Some numerical simulations are carried out to study the grain breakage process and its effects on localized deformation bands formation. [25][26][27][28][29][30][31][32][33] For example, Ip and Borja proposed a framework for modeling breakage process during compaction band formation by coupling a phase-field approach with modified Cam-Clay plasticity and breakage mechanics. 30 Wang et al developed conjugated bond-pair-based peridynamic 31,32 and phase-field model 33 for simulating fracture process and compaction bands formation, respectively.…”

Section: Introductionmentioning

confidence: 99%

A hypoplastic model for hydrate‐bearing sand considering hydrate saturation and grain breakage

Qian,

Wu,

et al. 2023

Num Anal Meth Geomechanics

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We present a hypoplastic model to capture the mechanical responses of hydrate‐bearing sands by incorporating hydrate saturation and grain breakage. In our model, a new degradation scalar is introduced to account for the effects of hydrate bonding evolution on strength. We also adopt the variable critical state line to assess the effects of hydrate saturation and relative breakage ratio at high confining pressure. This model is validated by modeling a series of laboratory tests.

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Numerical simulation of direct shear test of rockfill based on particle breaking

Cited by 13 publications

References 37 publications

Mechanism of strength degradation of frozen soil–rock mixture under temperature rise‐induced particle ice film ablation

Mechanism of strength degradation of frozen soil–rock mixture under temperature rise‐induced particle ice film ablation

Research on Deformation and Fracture Characteristics of the Fractured Rock Mass Under Coupling of Heavy Rainfall Infiltration and Mining Unloading

A hypoplastic model for hydrate‐bearing sand considering hydrate saturation and grain breakage

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