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

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

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

Simulation for Silos Discharge with 2D DEM

2011 ◽  
Vol 236-238 ◽  
pp. 2721-2724
Author(s):  
Shou Yi Bi ◽  
Xing Pei Liang
Keyword(s):  
Numerical Model ◽  
Discrete Element Method ◽  
Static Pressure ◽  
Lateral Pressure ◽  
Dynamic Pressure ◽  
Discrete Element ◽  
Particle Flow ◽  
Static Equilibrium State ◽  
Good Agreement ◽  
Element Method

In this paper, using the discrete element method (PFC2D)particle flow procedure to establish a model of cylindrical silo, in the warehouse filled with particles within the reach of static equilibrium state, then the record of its wall static lateral pressure measurement value, while monitoring the measured dynamic wall pressure during the silo discharging. It was shown that the static pressure as well as the dynamic pressure simulated with the numerical model is in good agreement with the experimental results. So the discrete element method can give a new way to study dynamic question of silos.

scholarly journals Modelling of Rock Cutting with Asymmetrical Disc Tool Using Discrete-Element Method (DEM)

2021 ◽  
Author(s):  
Grzegorz Stopka
Keyword(s):  
Discrete Element Method ◽  
Simulation Model ◽  
Laboratory Tests ◽  
Experimental Studies ◽  
Deep Understanding ◽  
Discrete Element ◽  
Rock Cutting ◽  
Analytical Models ◽  
Mining Methods ◽  
Element Method

AbstractThe use of asymmetrical disc tools for the mining of hard and very hard rocks is a promising direction for developing mechanical mining methods. A significant obstacle in developing mining methods with the use of asymmetric disc tools is the lack of adequate computational methods. A deep understanding of rock–tool interaction can develop industrial applications of asymmetric disc tools significantly. The fundamental problem in designing work systems with asymmetric disc tools is the lack of adequate analytical models to identify tool loads during the mining process. One reasonable approach is to use computer simulation. The purpose of the research was to develop a simulation model of rock cutting using an asymmetrical disc tool and then evaluate the developed model. In the article, the Discrete-Element Method (DEM) in LS-Dyna was adopted to simulate rock cutting with asymmetrical disc tools. Numerical tests were conducted by pushing the disc into a rock sample at a given distance from the sample edge until the material was detached entirely. Two types of rock samples were used in the simulation tests: concrete and sandstone. The independent variables in the study were the disc diameter and the cut spacing. To validate the simulation model, analogous laboratory tests were carried out. The article presents a comparison of the results of simulation and laboratory tests. The given comparison showed good accordance LS-Dyna model with the experimental studies. The proposed test results can be input data for developing simulation models on a larger scale. Thus, it will be possible to consider the complex kinematics of the dynamics of the rock-mining process with disc tools using the DEM simulation.

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
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