Energy dissipation in soil samples during cyclic triaxial simulations

Keishing, Joel; Huang, Xin; Hanley, Kevin J.

doi:10.1016/j.compgeo.2020.103481

Cited by 13 publications

(3 citation statements)

References 46 publications

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“…The external energy, dW external , is converted to components of internal energy in the DEM simulation: change in elastic strain energy stored in linear springs, dE strain ; change in translational kinetic energy (particle motion), dE kinetic ; energy lost in frictional sliding when particle contact frictional strength is exceeded, dE friction ; and energy lost in damping due to the rearrangement of particles, dE damping [4,8,20,24,42,57,59]. Applying the first law of thermodynamics to these components results in Eq.…”

Section: Energy Calculationsmentioning

confidence: 99%

Relationship between acoustic emission and energy dissipation: a DEM study of soil–structure interaction

Smith

2022

Acta Geotech.

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Acoustic emission (AE) monitoring offers the potential to sense particle-scale interactions that lead to macro-scale responses of granular materials; however, there remains a paucity of understanding of the fundamental links between particle-scale mechanisms and AE generation in particulate materials, which limits interpretation of the measured AE. The objective of this study was to establish links between particulate-scale energies and AE activity measured at the macro-scale in experiments. To achieve this, a programme of 3D DEM simulations was performed on granular soil/steel structure interfaces and the results were compared with experimental measurements. The findings show that the fundamental particulate-scale mechanisms that contribute to AE generation are friction and damping in particulate rearrangement, with friction being the dominant mechanism (i.e. > 95% of the total energy). Dissipated plastic energy was influenced in the same way as measured AE activity by unload–reload behaviour, imposed stress level, mobilised shearing resistance, and shearing velocity. Relationships have been established between AE and dissipated plastic energy (R2 from 0.96 to 0.99), which show AE generated per Joule of dissipated plastic energy is significantly greater in shearing than compression. A general expression has been proposed that links AE and plastic energy dissipation. This new knowledge enables improved interpretation of AE measurements and underpins the development of theoretical and numerical approaches to model and predict AE behaviour in particulate materials.

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Section: Energy Calculationsmentioning

confidence: 99%

Relationship between acoustic emission and energy dissipation: a DEM study of soil–structure interaction

Smith

2022

Acta Geotech.

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“…Energy behavior is mostly regarded as the connection of the microscale and macro mechanism. The total and dissipation energies are mostly discussed in the DEM (Zhou et al 2013;Keishing et al 2020). The input and release of the energy are however usually along with the crack generation, which make it have necessity to discuss the failure behavior by coupling the two effects.…”

Section: Coupling Effects Of Energy and Cracks On Failure Behaviormentioning

confidence: 99%

Experimental investigation and discrete element method simulation on mechanical properties and failure mechanism of polymer-stabilized sand

Che

Jin

et al. 2021

Bull Eng Geol Environ

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Natural sand can be heavily eroded due to its weak internal cohesion, and most solutions are reinforced by recovering particle connections regardless of their environmental impact. In view of this, our study focuses on an organic polymer reinforcement (PU) and investigates the strength, failure behavior, and energy evolution. Unconfined compressive tests are conducted, and the DEM method is used to establish corresponding numerical models, which contains the various polymer contents and densities. The results indicate that the compressive strengths are strongly improved with increasing polymer content and specimen density. The polymer has significant impacts on mechanical strength, failure behavior, and energy evolution. The failure pattern of the specimens with various polymer contents is changed from single to multiple path cracks. The specimens of various densities, however, only have difference in path extension. The failure process of the polymer-stabilized sand distinctly depends on the bond breakage state. Its increment curves can be divided into compaction phase, slow expansion phase, fast propagation phase, and stability phase. The instability microstructure of force chains is transformed by polymer effects, which causes force-chain reconstruction, micro-cracks redistribution, and energy increment. The level of energy averages and releasing rates are both improved with the polymer content. The insights from the physical and numerical tests are expected to help understand the possible reinforcement mechanisms of polymer and the potential relations between cracks development and energy evolution.

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“…[2][3][4][5][6][7][8], few studies have been conducted on the dynamic properties of lunar soil simulant under cyclic triaxial test. Though there are some studies on the dynamic properties of geotechnical engineering under cyclic loading [9][10][11], these studies mainly focused on earth soils (sand, clay, frozen soil) by carrying out a series of cyclic triaxial experiments or numerical simulations. According to the project of the International Lunar Research Station (ILRS), Lunar transportation and operation facility will be constructed by 2035 for exploration and use of the Moon [12].…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties of QH-E Lunar Soil Simulant under Conventional Triaxial and Cyclic Triaxial Tests

Li,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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Study of the mechanical properties of lunar soil simulant is the key to conducting lunar soil sampling and lunar base construction. In this paper, conventional and cyclic triaxial tests are performed by using discrete element method (DEM) to study the mechanical properties of QH-E lunar soil simulant. The results indicate that the confining pressure has an important impact on the shear strength and dynamic modulus of QH-E lunar soil simulant. In the conventional triaxial test, with the increasing of the confining pressure, both the peak deviatoric stress and residual stress increase, and the relevant results have been supported by experiments. In cyclic triaxial test, the area of cyclic hysteresis loop decreases with the increasing of the number of cycles, the axial strain and dynamic modulus first increase and then tend to be stable with the increasing of the number of cycles. Moreover, the axial strain increases with increasing confining pressure, while dynamic modulus decreases at a specific cyclic stress ratio (CSR) condition.

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Energy dissipation in soil samples during cyclic triaxial simulations

Cited by 13 publications

References 46 publications

Relationship between acoustic emission and energy dissipation: a DEM study of soil–structure interaction

Relationship between acoustic emission and energy dissipation: a DEM study of soil–structure interaction

Experimental investigation and discrete element method simulation on mechanical properties and failure mechanism of polymer-stabilized sand

Study on Mechanical Properties of QH-E Lunar Soil Simulant under Conventional Triaxial and Cyclic Triaxial Tests

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