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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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01 Jan 2001
TL;DR: In this article, the performance of two municipal solid waste landfill final covers was investigated, with test pits exca- vated and soil and geotextile samples collected, and the results showed that the cover components were generally in good condition and performing their intended function in the field.
Abstract: The performance of two municipal solid waste landfill final covers was investigated. A field investigation of each landfill was performed, with test pits exca- vated and soil and geotextile samples collected. The investigation and analysis showed that the cover components were generally in good condition and performing their intended function in the field. Differential settlements that had occurred at both land- fills were modeled with a finite difference code. The model results were used to calcu- late geomembrane strains and relate them to surface settlement characteristics. Using this method, two areas of differential settlement at one of the landfills were evaluated, and the geomembrane strains were found to be well below yield strains. In addition, a general design method for composite landfill covers spanning voids was developed with the finite difference model.
4 citations
23 Jan 2004
TL;DR: The axial-load-displacement-capacity response of drilled shaft foundations can be analyzed efficiently using the results of seismic piezocone tests (SCPTu) which provide four independent readings in the ground: cone tip stress, sleeve friction, penetration porewater pressure, and downhole shear wave velocity as mentioned in this paper.
Abstract: The axial-load-displacement-capacity response of drilled shaft foundations can be analyzed efficiently using the results of seismic piezocone tests (SCPTu) which provide four independent readings in the ground: cone tip stress, sleeve friction, penetration porewater pressure, and downhole shear wave velocity. The penetration data are used in a direct CPT method to assess side resistance and end-bearing capacity components, while the shear wave provides the initial stiffness for an elastic continuum analysis of vertical displacements and axial load transfer distributions. Results from instrumented drilled shaft load tests conducted at the national geotechnical experimentation sites at College Station, Texas and Opelika, Alabama are utilized to illustrate the methodology. The authors conclude that the results of seismic cone tests can be used to assess the entire load-deflection, capacity, and axial load transfer of drilled shafts within an elastic continuum framework.
4 citations
TL;DR: In this paper, the bearing capacity of a concrete footing placed near a wall of spaced driven concrete piles using three-dimensional finite-element (FE) analysis with ANSYS 13.0 is investigated.
Abstract: The stability of a footing may be destabilized near a retaining wall because of increased lateral displacement and decreased soil confining pressure. The stability of footing within this footing–soil–wall system is complex and not predicted using the classical solutions utilized for a semi-infinite footing–soil system. In this study, the bearing capacity of a concrete footing placed near a wall of spaced driven concrete piles using three-dimensional finite-element (FE) analysis with ANSYS 13.0 is investigated. All system materials are idealized as nonlinear, elastic–perfectly plastic, and rate independent using the upper bound function of the Drucker–Prager yield criterion. Three different soil deposits are studied: kaolin, silty clay, and kaolin–sand. A total of 144 unique FE analysis runs are executed. The footing bearing capacity is computed from the output footing pressure–settlement curve using several well-known postprocessing linearization criteria from which the lowest value is chosen. Soi...
4 citations
TL;DR: In this paper, the correlation established between pressure meter modulus (EM) and SPT blow count (N60) was investigated in the Kenny Hill Formation, Kuala Lumpur, Malaysia.
Abstract: Soil investigation (SI) work is a process of collecting subsurface ground profile information in evaluating soil engineering properties for a construction project. The standard penetration method (SPT) is widely accepted worldwide as a feasible and relatively inexpensive method over other field tests. Pressuremeter test (PMT), on the other hand, is costly and more popular in situ method in interpreting soil deformation behavior. Considering SPT is available in almost site investigation works for all sizes of project, it was tempting to establish the correlation between SPT and PMT results, specifically in local geologic setting. The study was conducted in Kenny Hill Formation, Kuala Lumpur, Malaysia. The correlation established in this study is between pressuremeter modulus (EM) and SPT blow count (N60). In addition to in situ methods, the physical properties of soil extruded from boreholes were tested in geotechnical laboratories to determine soil properties, such as particle size distribution, liquid limit, and plastic limit. These parameters need to be considered during prediction of EM. Group method of data handling (GMDH) neural network has been used to achieve this objective. The mean absolute error (MAE) results show that the GMDH neural networks produce values of 8.04 and 8.59 for training and testing. The root mean square error (RMSE) yields 10.61 and 10.84 for training and testing, respectively. Further, the results of the coefficients of determination (R2) are 0.794 and 0.726 for training and testing demonstrates a good correlation exists between predicted and measured values. Based on the GMDH results, N60, sand, and clay are required input variables for determination of EM.
4 citations
TL;DR: In this article, an experimental investigation on piled raft foundation under vertical load was conducted to establish a new method for estimating the loads shared by the piles and raft using the interaction factors and the stiffness values of unpiled raft and pile group.
Abstract: The complex load sharing mechanism between the raft and piles involving various interaction effects makes the piled raft system very popular and economic for the foundations of high-rise buildings around the world. This study highlights the outcomes of an experimental investigation on piled raft foundation under vertical load to establish a new method for estimating the loads shared by the piles and raft using the interaction factors and the stiffness values of unpiled raft and pile group. From the results, the pile-raft interaction factor $$\left( {\lambda_{{{\text{p}} - {\text{r}}}} } \right)$$
is found to decrease initially and then increase as the raft settles further. However, the raft-pile interaction factor $$\left( {\lambda_{{{\text{r}} - {\text{p}}}} } \right)$$
is observed to increase initially and then decrease indicating a positive influence of raft-pile interaction on the load response of piles. The piled raft coefficient (αPR) is found higher, i.e., 0.83 initially and then converges to 0.51 when the raft settlement reaches a value equals to 10% of the raft width. The developed model is validated with the centrifuge test data available in the literature. Simplified expressions to calculate various interaction factors and the piled raft coefficient are also proposed on the basis of the experimental results.
4 citations