Discrete element analysis of the deformation and failure characteristics of deposits during biaxial compression based on flexible boundary

Biaxial compression model tests on rockmass containing intermittent joints under plane stress condition were carried out in this study, where the laser speckle photo technique was used for measuring the displacement field. The results obtained have indicated that the laser speckle method was effective and the measuring value was about 14% less than the measuring value of dial gauges. Based on the displacement field and the principal stress field which were measured by laser speckle photo technique, dial gauges and strain gauges, the angle of wing incipient crack, the evolution of stress field at the joint tip and the path of crack extension were deeply studied. The deformation and failure characteristics, including the fracture mechanism of rockmass, were also analyzed in this study.

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Investigating the deformation and failure characteristics of argillite consequent slope using discrete element method and Burgers model

Environmental Earth Sciences ◽

10.1007/s12665-017-6401-7 ◽

2017 ◽

Vol 76 (2) ◽

Cited By ~ 3

Author(s):

Sih-Siao Lin ◽

Chia-Ming Lo ◽

Yi-Ching Lin

Keyword(s):

Discrete Element Method ◽

Discrete Element ◽

Failure Characteristics ◽

Deformation And Failure ◽

Burgers Model ◽

Element Method

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Discrete Element Analysis of High-Pressure Zones of Sea Ice on Vertical Structures

Journal of Marine Science and Engineering ◽

10.3390/jmse9030348 ◽

2021 ◽

Vol 9 (3) ◽

pp. 348

Author(s):

Xue Long ◽

Lu Liu ◽

Shewen Liu ◽

Shunying Ji

Keyword(s):

High Pressure ◽

Sea Ice ◽

Failure Mode ◽

Contact Area ◽

Loading Rate ◽

Discrete Element ◽

Offshore Platforms ◽

Marine Structures ◽

Element Analysis ◽

Ice Pressure

In cold regions, ice pressure poses a serious threat to the safe operation of ship hulls and fixed offshore platforms. In this study, a discrete element method (DEM) with bonded particles was adapted to simulate the generation and distribution of local ice pressures during the interaction between level ice and vertical structures. The strength and failure mode of simulated sea ice under uniaxial compression were consistent with the experimental results, which verifies the accuracy of the discrete element parameters. The crushing process of sea ice acting on the vertical structure simulated by the DEM was compared with the field test. The distribution of ice pressure on the contact surface was calculated, and it was found that the local ice pressure was much greater than the global ice pressure. The high-pressure zones in sea ice are mainly caused by its simultaneous destruction, and these zones are primarily distributed near the midline of the contact area of sea ice and the structure. The contact area and loading rate are the two main factors affecting the high-pressure zones. The maximum local and global ice pressures decrease with an increase in the contact area. The influence of the loading rate on the local ice pressure is caused by the change in the sea ice failure mode. When the loading rate is low, ductile failure of sea ice occurs, and the ice pressure increases with the increase in the loading rate. When the loading rate is high, brittle failure of sea ice occurs, and the ice pressure decreases with an increase in the loading rate. This DEM study of sea ice can reasonably predict the distribution of high-pressure zones on marine structures and provide a reference for the anti-ice performance design of marine structures.

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Deformation and failure characteristics of sandstone subjected to true‐triaxial unloading: An experimental and numerical study

Fatigue & Fracture of Engineering Materials & Structures ◽

10.1111/ffe.13470 ◽

2021 ◽

Author(s):

Fan Xiao ◽

De‐Yi Jiang ◽

Fei Wu ◽

Jie Chen ◽

Jian‐Zhi Zhang ◽

...

Keyword(s):

Numerical Study ◽

Failure Characteristics ◽

Deformation And Failure ◽

True Triaxial

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Discrete element analysis of the punching behaviour of a secured drapery system: from laboratory characterization to idealized in situ conditions

Acta Geotechnica ◽

10.1007/s11440-020-01119-z ◽

2021 ◽

Author(s):

Antonio Pol ◽

Fabio Gabrieli ◽

Lorenzo Brezzi

Keyword(s):

Mechanical Response ◽

Steel Wire ◽

Discrete Element ◽

Wire Mesh ◽

Steel Plates ◽

Loading Conditions ◽

Element Analysis ◽

In Situ Conditions ◽

Wire Meshes

AbstractIn this work, the mechanical response of a steel wire mesh panel against a punching load is studied starting from laboratory test conditions and extending the results to field applications. Wire meshes anchored with bolts and steel plates are extensively used in rockfall protection and slope stabilization. Their performances are evaluated through laboratory tests, but the mechanical constraints, the geometry and the loading conditions may strongly differ from the in situ conditions leading to incorrect estimations of the strength of the mesh. In this work, the discrete element method is used to simulate a wire mesh. After validation of the numerical mesh model against experimental data, the punching behaviour of an anchored mesh panel is investigated in order to obtain a more realistic characterization of the mesh mechanical response in field conditions. The dimension of the punching element, its position, the anchor plate size and the anchor spacing are varied, providing analytical relationships able to predict the panel response in different loading conditions. Furthermore, the mesh panel aspect ratio is analysed showing the existence of an optimal value. The results of this study can provide useful information to practitioners for designing secured drapery systems, as well as for the assessment of their safety conditions.

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