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
Citations
More filters
TL;DR: In this article, numerical models using a finite element method (FEM) were developed to analyze the buried High-Density Polyethylene (HDPE) pipelines subjected to the normal fault motions.
Abstract: Permanent ground deformation is one of the most damaging hazards for continuous buried lifelines. In this paper, numerical models using a Finite Element Method (FEM) were developed to analyze the buried High-Density Polyethylene (HDPE) pipelines subjected to the normal fault motions. The numerical predictions, were compared with those from ASCE Guidelines and with the experimental results obtained from geotechnical centrifuge tests. Moreover, the paper focuses on the effects of the design parameters such as, pipe diameter and thickness, pipeline burial depth, friction angle and density of the soil surrounding the pipe on the maximum bending strain as well as bending strain distribution along the pipeline. The results show that numerical models using a finite element method could produce reasonable predictions. However, the maximum predicted bending strains from the ASCE Guidelines are larger than those from experiments. The pipe deformation mechanisms are also significantly influenced by variation in burial depth, pipe surface characteristics, and backfill type.
22 citations
Journal Article•
TL;DR: In this article, the authors describe various types of foundation designs to be considered for structural engineering projects when the subsoil foundation consists of expansive or swelling soils. And they discuss problems associated with swelling soil, classification of structural damages caused to buildings.
Abstract: This study describes various types of foundation designs to be considered for structural engineering projects when the subsoil foundation consists of expansive or swelling soils. Among civil and architectural engineers expansive soils are known to be difficult foundation materials and problematic. These type of soils swell when they are subjected to moistures and shrink due to moisture loss. Because of this different behaviour upon wetting and drying, they cause minor to major structural damages to pavements as well as buildings. Every year millions of dollars spent dealing with the consequences of swelling soils. For design of foundations on swelling soil, it is first essential to recognize and evaluate the soil based on its swelling potential, and then determining the most proper foundation design that can be constructed on this problematic soil. In general, this study presents some of the most common techniques to evaluate the swelling potential of expansive soils. Also, it discusses problems associated with swelling soil, classification of structural damages caused to buildings, and various foundation designs to combat the problems based on the degree of detrimental effects of swelling potential to civil engineering projects.
22 citations
TL;DR: In this article, a 2D finite element method (FEM) using Shear Strain Reduction (SSR) analysis in the Phase2 software was used to determine the displacement and shear strain patterns of the slopes.
Abstract: Kharsali village, located in the Northwest Himalaya near the confluence of the Yamuna River and Unta Gad, is situated on a thick (>150 m) paleolandslide deposit. The village is continuously being eroded at its base by the two rivers. Cracks are noted in most houses while the ancient Shani Temple lying to the south of the village has tilted ~5° towards the northeast. Three slope sections (S-1, S-2, S-3) were modelled and analysed to determine the displacement and shear strain patterns of the slopes. Based on surface failure conditions, potential slope instability of the Kharsali village was evaluated from 2D Finite Element Method (FEM) using Shear Strain Reduction (SSR) analysis in the Phase2 software. Results indicate a critical Stress Reduction Factor (SRF) of 1.5 for the southern edge of the village (S-1) housing the Shani Temple. The development of failure surfaces at its lower portion signifies the propagating, progressive nature of the slope. The S-2 slope section is most vulnerable to slope failure, with a critical SRF of 1.08. This has been inferred by the formation of failure surfaces with displacements of 0.05–0.08 m. The S-3 section in the northern part of the Kharsali shows highest critical SRF of 2.76. The un-metalled road section in the north of the village near S-3 has developed a failure surface with displacement of 0.003–0.004 m, and a zone of subsidence. The S-3 section is relatively stable, whereas the S-2 section is the most vulnerable portion of the village.
22 citations
TL;DR: In this article, the authors proposed a procedure to determine partial factors in reliability based design format for pile foundations, considering bias as well as uncertainty in the parameters that represent soil-pile interaction.
Abstract: The present study proposes a procedure to determine partial factors in reliability based design format for pile foundations, considering bias as well as uncertainty in the parameters that represent soil-pile interaction. These issues are addressed using pile load-settlement test data from case studies obtained from the literature. The pile ultimate capacities are evaluated considering three different failure criteria. The uncertainties in the pile-soil interface parameters as well as pile ultimate capacity are quantified in Monte Carlo framework from the measured data by utilizing the closed form "t-z" method. Considering dead load to live load ratios as calibration points, the target reliability index is calculated based on existing code safety-checking format. The optimal partial factors are determined such that the difference between reliability index based on limit state equations expressed in terms of partial factors and target reliability index is minimum. Finally, it is observed that optimal partial factors enable rational choice of allowable load on pile foundation.
22 citations
TL;DR: In this paper, a modified plate-sinkage formula which takes into account the effect of both plate size and shape is developed. And the sensitivity of the new formula to variations in soil shear strength parameters and consequently to the soil response is examined.
22 citations