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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01 Jan 2011
TL;DR: In this paper, the authors present a brief summary of the failure of Azna1collar dam, a catastrophic slide that caused one of the worst environmental disasters in Spain, and describe the failure and the geometry and features of the slide.
Abstract: This document presents a brief summary of the failure of Azna1collar dam, a catastrophic slide that caused one of the worst environmental disasters in Spain. The account inc1udes a description of the failure and of the geometry and features of the slide and gives sorne information on the
analyses carried out both of initiation of the failure and of the post-failure events. It was found that the main causes underIying the failure were the occurrence of progressive failure in the brittle foundation c1ay and the presence of very high pore water pressures in the foundation. The mechanism of the failure also explains the large post- failure movements (more than 50 m) that were responsible for the large spill of tailings.
3 citations
Dissertation•
01 Sep 2002
TL;DR: In this article, the authors used load settlement curves from pile load test results to find out the ultimate capacity of pile by Davisson, Butter & Hoy and British Standard methods, and showed that there is little or almost no correlation with the settlement of pile with the ultimate load capacity.
Abstract: Soil investigation and foundation design may together account for a significant cost of a building while encountered. with a geologic situation that has low bearing capacity. In this s£tuation, the greatest concem of the geotechnical engineers ought to be design of a foundation from a number of technically acceptable alternatives based on economy of the whole scheme. Recently, different engineering agencies (such as PWD, LGED etc.) of Bangladesh has started using precast and cast-in-situ (bored) piles for their different projects located in different parts of Bangladesh. There are two objectives behind using piles. Firstly, low cost precast RCC Piles of 175 mm by 175 mm with 7m length have been used as a replacement for the timber piles for low-rise structures constructed on soil of low bearing capacities. On the other hand, 300 mm by 300 mm precast square RCC piles with 11 m length and bored piles of 400 mm to 500 mm diameter with 12 m to 18m length are used for medium rise structures. Moreover, for some high rise structures, piles of required dimensions have been used. Ultimate load capacity of at least 1% of all those piles has been estimated by Static Pile Load Test. In this study ultimate pile load capacity of Bangladesh has been studied. The database comprise of pile load test reports at thirty Public Works Department sites in different parts of Bangladesh. Among the pile load test data, twenty one is precast RCC piles and twenty five is RCC cast-in-situ piles. For the estimation of ultimate pile capacity in the static method, the total soil strata has been divided into some reasonable layers with specified soil properties. The precast piles are indexed as PTP-l, 2, 3 etc. and the cast-in-situ piles are indexed as CTp. 1,2,3 etc. . For static analysis CJ. or total stress method, f3 or effective stress method and A. or semi. empirical method have been used. In this study, load settlement curves from pile load test results are used to find out the ultimate capacity of pile by Davisson, Butter & Hoy and British Standard methods. After obtaining the ultimate pile load capacity values, correlation between ultimate pile capacities of tested piles and ultimate capacities obtained from static analysis as well as some correlation between ultimate pile capacities of tested piles and corresponding settlements are drawn. These correlation are made for precast as well as for cast-in-situ piles. The effect of different size and length of piles have also been considered. In all these cases there exist considerable correlation between the static analysis of pile capacity and capacity of pile from pile load test. This study has proved a higher degree of confidence to use the static formulae to find out the ultimate capacity of the piles. The attempt to correlate the settlement corresponding to ultimate capacity estimated from pile load test for the whole data has been found to be futile. Regression Analysis shows that there is little or almost no correlation with the settlement of pile with the ultimate capacity. Correlation has only been established between settlement and ultimate pile capacity for eastin-situ end bearing piles by following Chin's method.
3 citations
TL;DR: In this paper, a series of reduced-scale models were tested to assess the performance of non-yielding basement wall due to strip footing constructed adjacent to it, and the results revealed that the strip footing load-carrying capacity increased and the settlement decreased as its distance from the back of nonyielding wall increased.
Abstract: A series of reduced-scale models were tested to assess the performance of non-yielding basement wall due to strip footing constructed adjacent to it. Construction design parameters such as strip footing width (B), its distance from non-yielding wall back (a), and footing embedment depth below the backfill surface (df) have been considered in this study. This paper presents results of five model tests that isolate effects of non-yielding wall on the strip ultimate footing bearing capacity. The opposite effect of the strip footing distance design parameters on the non-yielding wall responses is also investigated. Experimental results revealed that the strip footing load-carrying capacity increased, and the settlement decreased as its distance from the back of non-yielding wall increased. Furthermore, the vertically loaded strip footing imposed significant vertical and horizontal forces at the back of the non-yielding wall. Results also indicate that distance a > 4B between the footing and the back of the wall enabled the strip footing to mobilize ultimate load-carrying capacity comparable to both control strip footing test and value calculated with Terzaghi’s equation. Comparison of the measured and predicted lateral forces showed that using elastic theory method together with Jacky formula for at-rest lateral earth pressure coefficient led to about 23–35% underestimation of the measured lateral forces. However, including sand overconsolidation ratio, OCR = 2 resulted in an overestimation of the lateral forces by about 20–29% of the measured value. Finally, results of the experimental program are used to identify sources of conservativeness and non-conservativeness in the current design methodologies used to calculate lateral forces imposed on non-yielding walls due to adjacent strip footing and suggested necessary modifications.
3 citations
01 Jan 2013
TL;DR: In this article, the impact of soil structure interaction on the seismic response of framed structures was investigated by modeling the soil as nonlinear spring and as elastic continu- um, and the effects of soil-structure interaction were presented in the form of fundamental period of vibration and base shear.
Abstract: Seismic response of structures is extremely complex because of the non-linear behaviour soils during earthquakes. Usually in the seismic design of buildings, soil structure interaction is neglected and the dynamic response of the structure is evaluated under the assumption of a fixed or a hinged base re- sponse. The code based method of seismic analysis is also seldom based on the soil structure interaction effect because of the complexity in the analysis proce- dures. In this paper, the interaction between the super-structure and sub-structure is investigated by modelling the soil as nonlinear spring and as elastic continu- um. To illustrate the effects of soil-structure interaction on the seismic response of framed structures, frames with 5, 10, 20 and 40 storeys have been considered with base supported as fixed with and without considering the soil structure interaction. Influence of soil structure interaction by modeling soil as compression only spring and elastic continuum are presented in the form of fundamental period of vibration and base shear.
3 citations
TL;DR: In this article, non-dimensional probabilistic curves in terms of displacement and flexural moment coefficients are presented under the hypothesis of linear variation of the secant soil modulus of the soil reaction with depth.
3 citations