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Bearing capacity of circular footings resting on unsaturated desiccated soils

Lozada, Catalina; Thorel, Luc; Caicedo, Bernardo (ICE PublishingReino Unido, 2019)

When a clayey soil is exposed to desiccation, water evaporates from the surface. During dry periods, the soil may suffer from shrinking phenomena, the saturation degree decreases and formation of cracks begins. At the same ...
A new climatic chamber for studying soil–atmosphere interaction in physical models

Lozada, Catalina; Caicedo, Bernardo; Thorel, Luc (ICE PublishingReino Unido, 2019)

A new climatic chamber at the Universidad de Los Andes in Bogotá, Colombia has been designed and built to simulate atmosphere. It has been instrumented to measure various environmental variables, including relative humidity ...

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Bearing capacity of circular footings resting on unsaturated desiccated soils
...
Lozada, Catalina | 2019

When a clayey soil is exposed to desiccation, water evaporates from the surface. During dry periods, the soil may suffer from shrinking phenomena, the saturation degree decreases and formation of cracks begins. At the same time, an overconsolidated soil appears at the surface of the deposit. Some previous studies devoted to this problem have highlighted the impact of cracks on desiccated profiles. However, these analyses have been carried out without considering the suction effect. The present study examines the specific case of the cracked soils found in the area of Sabana de Bogotá in Colombia. In this research, some soil models are tested using the Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux's geotechnical centrifuge. In this paper, the experimental procedure is first described. Then, the experimental results for the bearing capacity are presented. Finally, an analysis of the bearing capacity is carried out by considering the matric suction effect. This analysis compares different theoretical methods used to calculate the bearing capacity of shallow foundations resting on unsaturated soils with the experimental results obtained using the centrifuge. The results of the analysis underline the necessity of considering suction for the computation of the bearing capacity of unsaturated soils.

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A new climatic chamber for studying soil–atmosphere interaction in physical models
...
Lozada, Catalina | 2019

A new climatic chamber at the Universidad de Los Andes in Bogotá, Colombia has been designed and built to simulate atmosphere. It has been instrumented to measure various environmental variables, including relative humidity (RH), wind velocity, radiation and temperature. The climatic chamber has been calibrated so that it properly simulates each environmental variable as well as the heat-transfer mechanisms that affect desiccation in soil layers. First, a potential evaporation test was performed in a container filled with water. The weight of the water evaporated was measured, and the interaction with the artificial atmosphere was studied. Then, an actual evaporation test was performed on a soil layer, and the relations among environmental variables and soil properties such as soil temperature, water content and suction were determined. The principal results show the existence of a gradient of RH at the soil–atmosphere interface. Also, a comparison between potential and actual evaporation indicates that suction is the main soil property that affects the actual evaporation rate.

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Repositorio Digital

Browsing AN - Grupo de Investigación en Geotecnia by Author "Caicedo, Bernardo"

Bearing capacity of circular footings resting on unsaturated desiccated soils

A new climatic chamber for studying soil–atmosphere interaction in physical models

Envíos recientes

Bearing capacity of circular footings resting on unsaturated desiccated soils

A new climatic chamber for studying soil–atmosphere interaction in physical models

Browsing AN - Grupo de Investigación en Geotecnia by Author "Caicedo, Bernardo"

Bearing capacity of circular footings resting on unsaturated desiccated soils ﻿

A new climatic chamber for studying soil–atmosphere interaction in physical models ﻿

Envíos recientes

Bearing capacity of circular footings resting on unsaturated desiccated soils

A new climatic chamber for studying soil–atmosphere interaction in physical models

Bearing capacity of circular footings resting on unsaturated desiccated soils

A new climatic chamber for studying soil–atmosphere interaction in physical models