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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Journal Article•
TL;DR: In this paper, the average stress increment required for consolidation settlement computations is estimated based on the integration of Boussinesq's equations for common foundations and various soil configurations.
Abstract: Current practice of estimating average stress increment required for consolidation settlement computations employs mid-depth stress approach or multiple application of sublayer technique, which are tedious and difficult methods to implement for hand calculations. This paper presents simplified charts to estimate such a stress. The influence factor needed to estimate the average stress increment is calculated based on the integration of Boussinesq’s equations for common foundations and various soil configurations. The results are presented in a series of normalized non-dimensional charts, which are independent of structural loads and soil characteristics. The derived charts are useful especially when the compressible layer is not directly located underneath the loaded foundation and they avoid the necessity of dividing the soil into a series of sublayers to obtain a realistic value of average stress increment. They can be readily implemented into design allowing accurate prediction of consolidation settlement or can serve as a powerful tool for optimizing and proportioning the dimensions of footings under certain allowable settlement where otherwise an iterative tedious solution is required. Illustrative examples are presented to demonstrate the applicability and efficiency of the suggested charts for consolidation settlement computations.
1 citations
01 Jan 2001
TL;DR: In this article, the authors used ultrasonic methods for the determination of small-strain elastic properties of compacted clayey soils and found that constrained, Young's, and shear moduli increased monotonically, while constrained modulus exhibited a peak for wet of optimum and optimum water content samples.
Abstract: In this study ultrasonic methods were used for the determination of small-strain elastic properties of compacted clayey soils. Three clayey soils compacted at different moisture contents and compactive efforts were tested while drying. Piezoelectric transducers were used to generate and receive Pand Swaves on cubical soil samples with oblique corner cuts. Five elastic parameters of cross-anisotropy were calculated using three P-wave and two S-wave velocity measurements. Constrained, Young's, and shear moduli in the vertical and horizontal directions increased during drying. Young's and shear moduli increased monotonically, while constrained modulus exhibited a peak for wet of optimum and optimum water content samples. It was observed that Poisson's ratios decreased during drying and that the soils compacted with high compactive effort had lower Poisson's ratios compared to the soils compacted with low compactive effort at the same saturation level. Anisotropy value, n, increased for wet of optimum and optimum water content samples during drying, which was attributed to particle reorientation during shrinkage process. On the other hand, n did not change significantly for soils compacted at dry of optimum water content.
1 citations
TL;DR: In this paper, a simple rate-type constitutive model was used for the effective stressresponse. But the model was not applied to the case of axial traction on the face of a cylindrical cavity in saturated soil.
Abstract: The stress and deformation resulting from rapidly applied axial traction on the face of a cylindrical cavity
in a saturated soil are analysed. A simple rate-type constitutive model is used for the effective stress
response.
1 citations
11 Mar 2011
TL;DR: In this paper, a full scale instrumented trial embankment test was conducted to evaluate the effects of the Rammed Aggregate Pier (RAP) system on the very soft clays underlying railway embankments in the island of Luzon, the Philippines.
Abstract: A full scale instrumented trial embankment test was conducted to evaluate the effects of the Rammed Aggregate Pier (RAP) System on the very soft clays underlying railway a proposed embankment test site in the island of Luzon, the Philippines. A 5.0m high trial embankment was on a Section of a 10 kilometer stretch of railway on relatively very soft marshy ground to simulate embankment loads and the impact of train loads on railway embankments of the NORTHRAIL Railway. The study was initiated to prove that consolidation time in very soft clays could be accelerated by the lateral prestressing and prestraining effects of the rammed aggregates piers on the subgrade and the enhanced drainage effect of the RAP body. This paper discusses the test embankment construction, instrumentation and monitoring and the geotechnical exploration to gather soil parameters. The theoretical settlement calculations and field observations served as the bases for the findings reported. The results of the settlement monitoring program revealed that significant time savings could be realized during railway embankment construction if the RAP System is utilized, because time to full consolidation was accelerated to four (4) weeks instead of the calculated 6 to 8 months using other conventional ground improvement systems.
1 citations
01 Sep 2006
TL;DR: In this article, a new theory called impact load theory was proposed as an advancement of technology to both existing theories in modern pile driving and testing, which has led to the development of Y-Bearing Method in analytical and measurement models.
Abstract: Modern pile driving and testing methods presently involved two fundamental theories, ie Impulse-Momentum Theory and Wave Mechanics Theory which have been popular and widely accepted since 1930s and 1960s In 2000s, a new theory called Impact Load Theory, was proposed as an advancement of technology to both existing theories in modern pile driving and testing This paper presents the compatibility study of the new theory to both existing theories This new theory has led to the development of Y-Bearing Method in analytical and measurement models Technically, analytical model of Y-Bearing is compatible to the well known Hiley Method (based on impulse-momentum theory) In addition, measurement model of YBearing is compatible to Case Method (based on wave mechanics theory) This new technology enables the engineers to implement Y-Bearing Method during the pre-piling stage using its analytical model to complement the results based on Hiley Method and subsequently apply its measurement model during piling stage to compliment the results based on Case Method
1 citations