Analysis of effect of bentleg opener geometry on performance in cohesive soil using the discrete element method

2021 ◽  
Vol 209 ◽  
pp. 106-124
Author(s):  
Kojo Atta Aikins ◽  
James B. Barr ◽  
Diogenes L. Antille ◽  
Mustafa Ucgul ◽  
Troy A. Jensen ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Cohesive Soil ◽  
Discrete Element ◽  
Element Method

Stability analysis of cohesive soil embankment slope based on discrete element method

2020 ◽  
Vol 27 (7) ◽  
pp. 1981-1991
Author(s):  
Guang-ji Xu ◽  
Kun-zhi Zhong ◽  
Jian-wei Fan ◽  
Ya-jing Zhu ◽  
Yu-qing Zhang
Keyword(s):  
Stability Analysis ◽  
Discrete Element Method ◽  
Cohesive Soil ◽  
Discrete Element ◽  
Embankment Slope ◽  
Element Method

Analysis of effects of operating speed and depth on bentleg opener performance in cohesive soil using the discrete element method

2021 ◽  
Vol 187 ◽  
pp. 106236
Author(s):  
Kojo Atta Aikins ◽  
Diogenes L. Antille ◽  
Mustafa Ucgul ◽  
James B. Barr ◽  
Troy A. Jensen ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Cohesive Soil ◽  
Discrete Element ◽  
Operating Speed ◽  
Element Method

scholarly journals Combined DEM-FDM modelling of encased stone column

2019 ◽  
Vol 92 ◽  
pp. 16012
Author(s):  
Ahmadreza Gholaminejad ◽  
Ahmad Mahboubi ◽  
Ali Noorzad
Keyword(s):  
Discrete Element Method ◽  
Cohesive Soil ◽  
Discrete Element ◽  
Stone Columns ◽  
Stone Column ◽  
Coupled Modelling ◽  
Coarse Aggregates ◽  
Discrete Methods ◽  
The Continuum ◽  
Element Method

Combination of the continuum-based numerical methods and the discrete element method (DEM) could be a powerful way of simulating complex problems. This approach benefits from the capabilities of both methods. The main feature of the discrete element method is that the soil grains are considered as individual particles without need to impose any behaviour law in modelling the medium. The limitation of this method is, however, its high computational demand. In continuum based methods, on the other hand, it is impossible to trace micro scale phenomena. According to these facts, combining continuum and discrete methods is an optimal way in approaching geotechnical problems which deal with granular soils. In this approach, the coarse grain zone (medium) is modelled using DEM and the surrounding media are modelled using the continuum methods. Stone columns that are widely used for improving and/or increasing the strength of weak soils could be modelled using this type of coupled simulation. The Coarse aggregates present in the stone column make it appropriate for the coupled modelling. In this paper, the ordinary and encased stone columns have been simulated by combining 2D DEM and finite difference method (FDM). Clump technique was employed to achieve the interlocking of aggregate particles in DEM, and the surrounding cohesive soil was modelled using FDM. The obtained results were validated by the reported experimental results in the literature, indicating that the coupled DEM-FDM method is a robust way to simulate stone columns.

scholarly journals Identification of numerical model parameters of tunnel lining in non-cohesive soil

2018 ◽  
Vol 67 (4) ◽  
pp. 41-58
Author(s):  
Paweł Szklennik
Keyword(s):  
Numerical Model ◽  
Discrete Element Method ◽  
Laboratory Tests ◽  
Cohesive Soil ◽  
Discrete Element ◽  
Tunnel Lining ◽  
Model Parameters ◽  
Soil Medium ◽  
Numeric Model ◽  
Element Method

The paper discusses identification of numeric model parameters of tunnel lining in a soil medium according to the discrete element method. An author’s program based on the discrete element method was used. Laboratory tests were conducted to determine the computer model parameters defining the lining and the soil medium. The numerical model was calibrated by comparing the lining deformations occurring in the laboratory test and in the numeric simulation. Tunnel lining displacement during laboratory tests was determined using digital photography. Keywords: civil engineering, discrete element method, cylindrical tunnel lining

scholarly journals Numerical analysis of interaction between a model tunnel lining and non-cohesive soil

2019 ◽  
Vol 68 (1) ◽  
pp. 175-195
Author(s):  
Paweł Szklennik
Keyword(s):  
Numerical Model ◽  
Discrete Element Method ◽  
Laboratory Tests ◽  
Cohesive Soil ◽  
Discrete Element ◽  
Tunnel Lining ◽  
Tunnel Construction ◽  
Construction Loads ◽  
Surrounding Soil ◽  
Element Method

The paper presents an analysis and assessment of an interaction between a model tunnel lining and surrounding non-cohesive soil. The analysis was conducted with numerical simulations using the author’s program based on an algorithm of the discrete element method. Previously calibrated numerical model was used in the calculations. Calibration was based on comparison of the construction deformations observed in the laboratory tests and during the simulation. Numerous simulations, performed in the calibrated numerical model, included calculations for a flexible and rigid construction of the lining. The tunnel construction loads, stress distribution in the surrounding soil, and soil particles’ displacements were investigated. Analyses were conducted in two variants — when only soil weight is acting on the tunnel construction and when the external load transmitted from the surface is present. Also two variants of the backfill height were investigated — they were equal to one and two diameters of the tunnel. The values of tunnel loads, which were numerically calculated, were compared with the corresponding values, calculated by the Hewett’s method. It is shown that distribution of tunnel loads and stresses in the surrounding soil is strongly linked with the tunnel construction stiffness, thus it can be significantly different from standard load situations for such constructions. Keywords: civil engineering, discrete element method, tunnel lining

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

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