Full-Scale Dynamic Analysis of an Innovative Rockfall Fence Under Impact Using the Discrete Element Method: from the Local Scale to the Structure Scale

Abstract. This paper presents a numerical model based on Discrete Element Method (DEM) used to reproduce a series of tests of dry granular flow. The flow was composed of poly-dispersed coarse-grained angular particles flowing in an inclined flume and interacting with a divided rigid wall. The normal impact force against the wall has been studied in details considering the force on each part of the wall. The model has been calibrated based on the flow thickness measurements. By quantitative comparison with experimental data, the model showed good agreement in terms of peak force on each part of the wall, the time of the peak and also the residual force values at the end of the tests.

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“…In addition, DEM surpasses FEM when dealing with discontinuous problems where FEM becomes computationally demanding [18].…”

Section: Numerical Modelingmentioning

confidence: 99%

Modeling the Impact of Granular Flow against an Obstacle

Albaba

Lambert

Nicot

2015

Springer Series in Geomechanics and Geoengineering

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“…As an alternative approach to expensive physical experiments, numerical modeling can be used to investigate different configurations and boundary conditions of bolted steel mesh. While the finite element method can be used to model steel mesh, this modeling approach needs specific algorithms to deal with large deformations and failure of the steel mesh . Although the discrete element method (DEM) is also computationally intensive, the DEM can easily simulate the motion and large displacement between elements, making it more suitable for modeling the interaction between rock and mesh.…”

Section: Introductionmentioning

confidence: 99%

“…While the finite element method can be used to model steel mesh, 10,[15][16][17][18][19] this modeling approach needs specific algorithms to deal with large deformations and failure of the steel mesh. 20 Although the discrete element method (DEM) is also computationally intensive, the DEM can easily simulate the motion and large displacement between elements, making it more suitable for modeling the interaction between rock and mesh. The double-twisted hexagonal mesh was modeled by placing a particle (ball) at each node and introduced a virtual spring between two particles to capture the tensile behavior of one steel wire.…”

Section: Introductionmentioning

confidence: 99%

Discrete element analysis of the influence of bolt pattern and spacing on the force‐displacement response of bolted steel mesh

Tannant

Zheng

2019

Num Anal Meth Geomechanics

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Summary Steel wire mesh held by a pattern of bolts can be used to stabilize a rock slope. Knowledge of the force‐displacement response of steel mesh is essential in the design of this support system. Laboratory tests have been used to test mesh that is held to rigid steel frames. These testing conditions differ from how steel mesh is held in the field by bolts. The existing laboratory test data may underestimate the deformation and overestimate the load‐bearing capacity of the steel mesh. This paper focuses on the response of the high tensile strength steel mesh held by commonly used bolt patterns. Discrete element models were used to study the force‐displacement response of the steel mesh pinned by bolts. The influences of different bolt patterns and varying ratios of bolt spacing on the effectiveness of steel wire mesh were analyzed. Relationships between the resistance force of steel mesh and bolt density at various mesh deformations were developed. These relationships can help engineers choose the bolt spacing and provide an estimate of the resistance force that a steel mesh can mobilize at a desired deformation limit for a given bolt pattern.

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“…To better understand the energy-absorption mechanism and capacity of the energy dissipators, both quasistatic and dynamic tests are needed. e quasistatic tests are mainly performed in a horizontal or vertical traction machine, with one cable end of the dissipator fixed and the other cable end pulled [7][8][9][10]. e aim of the dynamic tests is to approximate more to real conditions, and the tests can be conducted in the following three ways.…”

Section: Introductionmentioning

confidence: 99%

“…e aim of the dynamic tests is to approximate more to real conditions, and the tests can be conducted in the following three ways. e first way is to fix one cable end of the energy dissipator to a hanging point and connect the other cable end to a block, and then the block is hoisted to a certain height and dropped freely [10,11]. e second way is to connect the energy dissipator to a horizontal cable anchored at both ends and let a block vertically impact the cable [12,13].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Mechanical Properties of a Tube‐Crushing Dissipator and a Symmetric Tube‐Crushing Dissipator

Wang

Shi

Wang³

2019

Advances in Civil Engineering

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e tube-crushing dissipator is widely used in engineering, but it has the eccentricity problem. erefore, a symmetric tubecrushing dissipator was proposed in this article, and quasistatic and dynamic tests were performed to compare mechanical properties of the tube-crushing dissipators and the symmetric tube-crushing dissipators. e results of the quasistatic tests show that the working force of the tube-crushing dissipators fluctuates around an average value which is about 20% smaller than the activation threshold after activation, while the working force fluctuates around an average value which is approximately equal to the activation threshold after activation. e results of the dynamic tests show that mean force at the crushing section of the tubecrushing dissipators and the symmetric tube-crushing dissipators increases with the increase of the impact velocity. Furthermore, the dynamic load-displacement curves are more volatile than those of the static tests. erefore, dynamic tests which are more similar to the real working conditions of the dissipators are preferable over static tests. In addition, the metal tubes of the symmetric tube-crushing dissipators collapse vertically both in the quasistatic and dynamic tests; that is, the eccentricity problem of the tube-crushing dissipators is overcome by the symmetric tube-crushing dissipators.

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Full-Scale Dynamic Analysis of an Innovative Rockfall Fence Under Impact Using the Discrete Element Method: from the Local Scale to the Structure Scale

Cited by 46 publications

References 25 publications

Modeling the Impact of Granular Flow against an Obstacle

Modeling the Impact of Granular Flow against an Obstacle

Discrete element analysis of the influence of bolt pattern and spacing on the force‐displacement response of bolted steel mesh

Comparative Study on Mechanical Properties of a Tube‐Crushing Dissipator and a Symmetric Tube‐Crushing Dissipator

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