The bearing capacity of the foundation is a primary concern in the field of foundation engineering. Structures may be built on or near slopes due to either land limitation issues, such as in retaining walls and bridges abutments, or architectural purposes. The ultimate bearing capacity of the foundation for these buildings is significantly affected by the presence of the slope. Design of foundation under these conditions is complex and the information available in the literature is limited. A numerical model has been developed to simulate the case of strip foundation near slope, using the explicit finite difference software “FLAC”, considering the constitutive law of soil as elastic-perfectly plastic. The parameters which govern this behavior were examined individually in order to determine their effects on the ultimate bearing capacity and the interaction locus of vertical and horizontal loads of a strip footing. Totally 328 models are simulated in the program for different granular soils. Initially, some calibrations have been done in order to find the optimum case of simulating model. Soil domain size, number of meshes in soil volume, and velocity of loading were calibrated. Subsequently, various parameters in simulation related to geometry and soil properties are changed, such as load inclination angle with vertical, different slope angles, different distance of foundation to the slope edge, different angles of frictions, and different dilation angles. Afterwards, the results produced by the program are compared and validated with available theoretical solutions in order to verify the quality of the results obtained from the program. An analytical solution considering the effects of slope is proposed for the problem stated to predict the interaction domain of a strip footing resting near a slope. Along with, a design chart is developed to predict the ultimate bearing capacity of a shallow foundation taking into account dilation angle which was not considered in the previous works. Design theory, design procedure, and design charts are provided for practical use.
Il calcolo della capacità portante delle fondazioni superficiali è un tema centrale in Ingegneria Geotecnica. A causa di vari fattori limitanti, o di scelte urbanistiche o architettoniche, le strutture possono essere costruite in prossimità di pendii, come nel caso di muri di sostegno o pile da ponte. La capacità portante ultima della fondazione di queste strutture è significativamente influenzata dalla presenza del pendio. La progettazione delle opere di fondazione in queste condizioni è complessa e le informazioni disponibili in letteratura è limitata. Un modello numerico è stato sviluppato per simulare il caso della fondazione nastriforme vicino ad un pendio, utilizzando il software esplicito alle differenze finite "FLAC", considerando la legge costitutiva del terreno elastico perfettamente plastico. I parametri che governano il problema sono stati esaminati singolarmente per determinare i loro effetti sulla capacità portante ultima e sul dominio di interazione tra carichi verticali e orizzontali agenti sulla fondazione. In totale 328 modelli sono stati simulate nel programma per diversi terreni granulari. Inizialmente, alcune calibrazioni sono state fatte al fine di ottimizzare la simulazione in termini di dimensione e discretizzazione del dominio, di velocità di carico, ecc. Successivamente, i vari parametri di simulazione relativi alla geometria e del terreno sono stati fatti variare, come angolo di inclinazione dei carichi sulla verticale, pendenza del pendio, distanza della fondazione dal ciglio, diversi angoli di attrito del materiale e di dilatanza. Successivamente, i risultati prodotti dal programma sono stati confrontati e con soluzioni teoriche disponibili in letteratura.
Interaction domain of shallow foundations on the top of a slope
NOURI, MEHDI
2013/2014
Abstract
The bearing capacity of the foundation is a primary concern in the field of foundation engineering. Structures may be built on or near slopes due to either land limitation issues, such as in retaining walls and bridges abutments, or architectural purposes. The ultimate bearing capacity of the foundation for these buildings is significantly affected by the presence of the slope. Design of foundation under these conditions is complex and the information available in the literature is limited. A numerical model has been developed to simulate the case of strip foundation near slope, using the explicit finite difference software “FLAC”, considering the constitutive law of soil as elastic-perfectly plastic. The parameters which govern this behavior were examined individually in order to determine their effects on the ultimate bearing capacity and the interaction locus of vertical and horizontal loads of a strip footing. Totally 328 models are simulated in the program for different granular soils. Initially, some calibrations have been done in order to find the optimum case of simulating model. Soil domain size, number of meshes in soil volume, and velocity of loading were calibrated. Subsequently, various parameters in simulation related to geometry and soil properties are changed, such as load inclination angle with vertical, different slope angles, different distance of foundation to the slope edge, different angles of frictions, and different dilation angles. Afterwards, the results produced by the program are compared and validated with available theoretical solutions in order to verify the quality of the results obtained from the program. An analytical solution considering the effects of slope is proposed for the problem stated to predict the interaction domain of a strip footing resting near a slope. Along with, a design chart is developed to predict the ultimate bearing capacity of a shallow foundation taking into account dilation angle which was not considered in the previous works. Design theory, design procedure, and design charts are provided for practical use.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/93410