Book•
Foundation analysis and design
01 Jan 1968-
TL;DR: In this paper, Fondation de soutenagement et al. presented a reference record for Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08.
Abstract: Keywords: Fondation ; Mur de soutenement ; Pieux ; Capacite portante ; Ancrage ; Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08
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TL;DR: In this article, a highway was constructed in Jiangxi Province, China, through a mountainous area, and some sections of the highway went through valleys where a soft clay layer 6-8·5 m deep was encountered.
Abstract: A highway was constructed in Jiangxi Province, China, through a mountainous area. Some sections of the highway went through valleys where a soft clay layer 6–8·5 m deep was encountered. A new explosive method was developed and adopted for this project. The method uses the energy of the explosion to remove the soft clay and replace it with crushed stones. Explosive charges are placed in the soil to be improved according to a specific pattern. Crushed stones are piled up next to the area where the charges are installed. The explosion creates cavities in the soil and causes the pile of crushed stones to slide into the exploded area. The detail of the method and its application to the highway project are described. The effectiveness of the method is evaluated using borehole exploration, plate load tests and groundprobing radar tests.
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Journal Article•
TL;DR: In this paper, the authors present a numerically study of the behavior of an eccentrically loaded circular footing resting on sand to determine its ultimate bearing capacity, and the results show that by increasing the load eccentricity, the ultimate load and the modulus of subgrade reaction decreased.
Abstract: This article is an attempt to present a numerically study of the behaviour of an eccentrically loaded circular footing resting on sand to determine its ultimate bearing capacity. A surface circular footing of diameter 12 cm (D) was used as shallow foundation. For this purpose, three dimensional models consist of foundation, and medium sandy soil was modelled by ABAQUS software. Bearing capacity of footing was evaluated and the effects of the load eccentricity on bearing capacity, its settlement, and modulus of subgrade reaction were studied. Three different values of load eccentricity with equal space from inside the core on the core boundary and outside the core boundary, which were respectively e=0.75, 1.5, and 2.25 cm, were considered. The results show that by increasing the load eccentricity, the ultimate load and the modulus of subgrade reaction decreased. Keywords—Circular foundation, eccentric loading, sand, modulus of subgrade reaction.
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Cites background from "Foundation analysis and design"
...The modulus of subgrade reaction is a conceptual relationship between contact pressure and footing deflection that is widely used in structural analysis of foundation members [22]....
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Dissertation•
01 Dec 2008
1 citations
TL;DR: In this paper, the authors presented a systematic procedure in which the variation in induced stresses in soil layers is effectively dealt with using only two sublayers using a customized two-point Gauss quadrature formula.
Abstract: This paper presents a systematic procedure in which the variation in induced stresses in soil layers is effectively dealt with using only two sublayers A customized two -point Gauss quadrature formula was derived to evaluate induced stresses such that the weight factors for the derived formula were set equal to those of the two -point Gauss -Legendre formula However, the base points were obtained by dividing the compressible layer into two sublayers whose thicknesses were determined such that their middle points are the base points for the derived formula The thickness of the two sublayers was expressed in terms of a factor called the sublayering ratio Expressions for this ratio were derived for different types of loads and loaded areas, and its values were presented in a series of normalized, non -dimensional charts Numerical examples were included to illustrate the use of the developed charts for obtaining the value of the sublayering ratio, and the application of the derived formula in settlement computations
1 citations
Dissertation•
01 Feb 2018
TL;DR: In this paper, a prototype model of a vertical wall, retaining horizontal backfill of overconsolidated collapsible soil, was developed in the laboratory by mixing kaolin clay with fine sand.
Abstract: Collapsible soils are known as problematic soils, which can be found in many regions around the world. Collapsible soils possess considerable strength when they are dry; however, when they are inundated, they lose their strength and exhibit excessive settlement. The amount of soil collapse increases with the increase of the so-called collapse potential “Cp”, the wetting zone, and the degree of saturation (S). Accordingly, maximum collapse will take place due to full saturation. Collapsible soils can be inundated by heavy and continuous rainfall, excessive irrigation, broken water/sewer lines, or by rising the ground water. Furthermore, collapsible soils can be also found in construction site, in compacted fine soils at low water content (less than the optimum water content). Consequently, it is impossible to avoid construction on collapsible soils, which are potential for excessive settlement, differential settlement, landslides and falls, earth cracks. This type of soil has been responsible for damaging variety of civil engineering structures, loss of lives. Construction on such kind of soil shows extraordinary geotechnical problems, retaining walls are not an exception. With civilization, backfills behind retaining walls made of collapsible soils are widely used in practice. The earth pressures acting on these walls experience radical changes when the backfills of collapsible soils are wetted.
In the literature, there are lack of theories/methods for estimating the earth pressures acting on walls retaining collapsible soils. In this study, experimental investigations on at-rest and passive earth pressures of overconsolidated collapsible soil on retaining walls were conducted.A prototype model of a vertical wall, retaining horizontal backfill of collapsible soil, was developed in the laboratory. Collapsible soil was prepared in the laboratory by mixing kaolin clay with fine sand. The model was instrumented to measure the earth pressure at strategic points on the wall, the total earth pressure acting on the wall, and the overconsolidation ratio (OCR) of the soil. Tests were conducted on the wall retaining collapsible soil at the dry and at fully saturated conditions for both the at-rest and passive earth pressures. The test results showed that both the at-rest and passive earth pressures increased with the increase of the collapse potential (Cp) and overconsolidation ratio (OCR) for the dry soil. At full saturation, the at-rest and passive earth pressures reduced considerably. Generally, the higher the collapse potential of the collapsible soil, the larger the decrease in the at-rest and passive earth pressures of the soil when the soil gets inundated.
In this investigation, for the case of at-rest earth pressure, empirical formulae were developed to determine the coefficient of at-rest earth pressure (K0) of the dry and saturated overconsolidated collapsible soil. For the case of passive earth pressure, analytical model was developed. Accordingly, design theory was presented for estimating the coefficient of passive earth pressure (Kp) of overconsolidated collapsible soil at the dry and saturated conditions. Moreover, considering for the case of presence of unsaturated states of collapsible soil in practice, design charts were developed to assist designers in approximating the coefficient of at-rest (K0) and passive (Kp) earth pressures of this soil at different degree of saturation.
1 citations