Laboratory test to study the effect of comminution in rockfalls
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Inclou dades d'ús des de 2022
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hdl:2117/349035
Tipus de documentComunicació de congrés
Data publicació2021
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Abstract
Fragmentation in rockfalls reduces the size of the blocks and increases the number of fragments. It affects the runout and the impact energies, having implications in the associated hazard and therefore in the subsequent risk. In some rockfall events, a young debris cover is formed during the first impacts, with a substantial reduction of the particle size. The large number of small particles generated in the debris cover suggests that beside the breakage of the particles, comminution by crushing and grinding may also occur during the impact. This contribution presents the results of the comminution tests carried out in the laboratory.A set of one, three and five stacked bricks of different colors were released. The tests aim at verifying and quantifying the following hypotheses for the brick located in the lower position of the stack: i) the fragments generated should be smaller, ii) the number of fragments generated should increase, and iii) both effects should intensify as the number of the stacked bricks increases. A total of 78 reduced scale tests were carried out using a set of stacked bricks that were dropped from a height of 4.26 m. The resulting fragments were separated by colors according to their initial position in the stacking and sieved obtaining the grain size distribution. A high-speed camera was used to record and interpret each test. A 3D photogrammetric reconstruction after each test was generated to register the final deposit. The obtained grain size distributions confirm the proposed hypothesis. Confinement reduces the maximum fragment size while increases substantially the total number of generated fragments and those effects increase with the number of stacked bricks.
CitacióMatas, G. [et al.]. Laboratory test to study the effect of comminution in rockfalls. A: International Symposium on Landslides. "International Society for Soil Mechanics and Geotechnical Engineering Online Library: 13th International Symposium on Landslides ( XIII ISL)". 2021, p. 1-7.
Versió de l'editorhttps://georisk.upc.edu/es/divulgacion
Col·leccions
- Departament d'Enginyeria Civil i Ambiental - Ponències/Comunicacions de congressos [1.272]
- EnGeoModels - Monitoring and Modelling in Engineering Geology - Ponències/Comunicacions de congressos [44]
- Doctorat en Enginyeria del Terreny - Ponències/Comunicacions de congressos [51]
- EGEO - Enginyeria Geomàtica - Ponències/Comunicacions de congressos [105]
Fitxers | Descripció | Mida | Format | Visualitza |
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matas_isl_2021_preprint-1.pdf | 1,119Mb | Accés restringit |