Review: Calibration of the discrete element method

1. Sediments and Methods of Their Study 2. Erosional Processes 2.1. Weathering 2.2. Transport 3. Depositional Processes and Sediment Types 3.1. Features of Detrital Sediments 3.2. Bedforms and Sedimentary Structures 3.3. Trace Fossils 3.4. Gravity Flows 3.5. Classification of Detrital Sediments 3.6. Origin of Chemogenic and Biogenic Sediments 3.7. Classification of Carbonate Rocks 4. Depositional Environments 4.1. Arid Continental Environments 4.2. Humid Continental Environments 4.3. Glacial Sediments 4.4. Shallow Marine Sediments 4.5. Deep Marine Sediments 5. Sedimentary Basins and Their Types and Preservation 6. The Facies Concept and Multi-Story Sedimentary Packages 7. Post-Depositional Processes 8. Sediment Utilization Glossary Bibliography Biographical Sketch

堆積岩 = Sedimentary rocks

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Design Of Concrete Structures

Calibration of the discrete element method and the effect of particle shape

The steady state of sandy soils

Discrete element modelling of cyclic loads of geogrid-reinforced ballast under confined and unconfined conditions

Investigating geogrid-reinforced ballast: Experimental pull-out tests and discrete element modelling

Discrete element modelling of lateral displacement of a granular assembly under cyclic loading

This paper presents an evaluation of the behaviour of geogrid-reinforced railway ballast. Experimental large box pull-out tests were conducted to examine the key parameters influencing the interaction between ballast and the geogrid. The experimental results demonstrated that the triaxial geogrid outperforms the biaxial geogrid and the geogrid aperture size is more influential than rib profile and junction profile. The discrete element method (DEM) has then been used to model the interaction between ballast and geogrid by simulating large box pull-out tests and comparing with experimental results. The DEM simulation results have been shown to provide good predictions of the pull-out resistance and reveal the distribution of contact forces in the geogrid-reinforced ballast system. Therefore, the calibrated geogrid model and the use of clumps to model ballast particles hold much promise for investigating the interaction between geogrids and ballast and therefore optimising performance.

/pdf/a-study-of-geogrid-reinforced-ballast-using-laboratory-pull-y7pe59setx.pdf

A study of geogrid-reinforced ballast using laboratory pull-out tests and discrete element modelling

This paper investigates the heating characteristics and induced healing efficiencies of asphalt mixture containing steel fiber under induction heating and microwave heating. The heating characteristics of an asphalt mixture with different heating methods were studied with an infrared camera. The healing performance of the asphalt mixture specimens in different healing conditions were investigated by observing the crack closure and testing the fracture resistance recovery after healing. The results showed that the heating speed at the surface of asphalt mixture with induction heating was much higher than that with microwave machine heating, under a similar output power and the same method of radiation. While the temperature distribution within the asphalt mixture under induction heating was quite uneven, microwave heating resulted in a more uniform temperature distribution. The effective heating depth of microwave heating is much higher than that of induction heating. Gradient healing occurred within the sample heated with induction healing, while a uniform healing effect can be achieved with microwave heating.

https://www.mdpi.com/1996-1944/11/6/913/pdf

Cheng Chen

Papers

Discrete element modelling of cyclic loads of geogrid-reinforced ballast under confined and unconfined conditions

Investigating geogrid-reinforced ballast: Experimental pull-out tests and discrete element modelling

Discrete element modelling of lateral displacement of a granular assembly under cyclic loading

A study of geogrid-reinforced ballast using laboratory pull-out tests and discrete element modelling

Heating Characteristics and Induced Healing Efficiencies of Asphalt Mixture via Induction and Microwave Heating