In the present work of thesis the response of a soil specimen being subjected to shock blast wave has been studied. The load is a shock wave, experimentally generated inside the shock tube, a device built to simulate explosive waves. This shock tube was designed to analyze the interaction between a concrete disk and the soil, during the application of the dynamic load. Because of the perfectly rigid response of the concrete disk, more attention has been taken on the soil behavior in the numerical analysis. The software used to simulate the behavior of the soil is PFC3D, a numerical code which make use of the distinct elements method (DEM). Particular attention has been paid to the construction of the numerical model, in order to better reproduce what happens during the experimental tests and to get information about the simulation of the behavior of a soil in the dynamic field through the distinct elements method. In order to demonstrate the goodness of the numerical simulation, the results of the numerical has been analyzed and compared to the experimental tests. At last, several sensitive analysis about the micromechanical parameters characterizing the model has been carried out in order to study their influence on the global behavior of the soil.
Nel presente lavoro di tesi viene analizzata la risposta di un terreno a carichi impulsivi. Il carico è costituito da un’onda d’urto, generata sperimentalmente all’interno dello shock tube, un dispositivo costruito per simulare onde esplosive. Lo shock tube in oggetto è stato ideato in particolare per analizzare l’interazione tra un disco di calcestruzzo ed il terreno all’applicazione del carico dinamico. Nelle analisi numeriche, data la risposta rigida del disco, ci si è concentrati sul comportamento del terreno. Il software utilizzato per simulare il comportamento del terreno è PFC3D, un codice di calcolo agli elementi distinti. Particolare attenzione è stata posta alla costruzione del modello numerico al fine di riprodurre al meglio la realtà sperimentale e trarre informazioni circa la simulazione del comportamento di un terreno in campo dinamico mediante elementi distinti. Per poter dimostrare la bontà della simulazione numerica, i risultati delle prove numeriche sono stati analizzati e comparati con i test sperimentali. Sono stati infine effettuati studi al variare dei parametri micromeccanici caratterizzanti il modello, andando a studiare la loro influenza sul comportamento globale del terreno.
Modellazione agli elementi distinti della propagazione di onde d'urto nel terreno
DELL'ERA, GIULIO;BONACINA, FRANCESCO
2012/2013
Abstract
In the present work of thesis the response of a soil specimen being subjected to shock blast wave has been studied. The load is a shock wave, experimentally generated inside the shock tube, a device built to simulate explosive waves. This shock tube was designed to analyze the interaction between a concrete disk and the soil, during the application of the dynamic load. Because of the perfectly rigid response of the concrete disk, more attention has been taken on the soil behavior in the numerical analysis. The software used to simulate the behavior of the soil is PFC3D, a numerical code which make use of the distinct elements method (DEM). Particular attention has been paid to the construction of the numerical model, in order to better reproduce what happens during the experimental tests and to get information about the simulation of the behavior of a soil in the dynamic field through the distinct elements method. In order to demonstrate the goodness of the numerical simulation, the results of the numerical has been analyzed and compared to the experimental tests. At last, several sensitive analysis about the micromechanical parameters characterizing the model has been carried out in order to study their influence on the global behavior of the soil.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/80875