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 time-dependent radiation damping for the time-domain wave equation analyses of single piles is introduced. But the damping coefficients are derived from the inverse Fourier Transform of these damping ratios and the static soil spring constants.
7 citations
Journal Article•
TL;DR: The current state of the art with respect to swelling pyritic shales is presented and discussed in this article, where factors and mechanisms responsible for swelling of pyritic sand are identified; methods of testing and evaluating the potentially expensive shales are outlined; and ways of controlling or eliminating the problem are summarized.
Abstract: Although much attention has been directed to the solution of problems created by swelling soils, relatively little effort has been devoted to the solution of problems created by expanding pyritic shales. This is a very real problem that has caused extensive damage to many structures in the United States and abroad. In an effort to call attention to this problem and to the need for further research directed at its solution, the current state of the art with respect to swelling pyritic shales is presented and discussed. The factors and mechanisms responsible for swelling of pyritic shales are identified; methods of testing and evaluating the potentially expensive shales are outlined; and ways of controlling or eliminating the problem are summarized. A number of case histories involving experiences with expansive pyritic shales are included to illustrate the potential seriousness of the problem and to underscore the need for additional research.
7 citations
TL;DR: A flexible multibody dynamics simulation model considering the coupling effects of the crane mechanical structure flexibility, ground deformation, and load's dynamic pendulum motion offers the slewing speed threshold, which can prevent stress and tipping failures for the crawler crane mounted on flexible ground.
7 citations
01 Jan 2014
Abstract: The current use of the Arkansas Standard Specifications for Highway Construction Manuals (2003, 2014) for driven pile foundations faces various limitations which result in designs of questionable reliability. These specifications are based on the Allowable Stress Design method (ASD), cover a wide range of uncertainties, do not take into account pile and soil types, and were developed for general use. To overcome these challenges it is deemed necessary to develop a new design and acceptance protocol for driven piles. This new protocol incorporates locally calibrated RLFD resistance factors for accounting for local design and construction experiences and practices, as well as specific soil conditions and pile types. In that perspective, this dissertation focuses on the design and acceptance of driven pile foundations (predominately for bridge projects) using an LRFD protocol. A great deal of insight is gained into the factors that contribute to the performance of deep foundations by conducting an extensive literature review. The research assembled a relatively large database of pile load tests where both static and dynamic load testing was performed and sufficient soils information existed to perform static design calculations. A MATLAB® based program was developed to use the information contained in the database to compute resistance factors for driven piles using the First Order Second Moment Method (FOSM), Improved FOSM, the First Order Reliability Method (FORM), and Monte Carlo Simulations (MCS). The research also addressed a technique to update resistance factors using Bayesian techniques when new load tests are added to the database. More importantly the dissertation formulated a design and acceptance protocol that seeks to unify the level of reliability for deep foundations through both the design and construction phases.
7 citations
Cites background from "Foundation analysis and design"
...AASHTO (2012) recommends an improved correlation between SPT-N value and undrained cohesion as suggested by Hara et al. (1974), but several other correlations also exist e.g., Bowles (1996)....
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TL;DR: In this article, a 2D finite element model of CPG based on the elasto-plastic theory of strain hardening is presented, which takes variations in stress-strain fields along the depth and the impact of the ground surface conditions on the grouting process.
Abstract: Compaction grouting method called as CPG is becoming popular as a ground improvement technique due to its wide variety of applications and several advantages. However, so far, the application of the method has been mainly dependent on field tests, practical experience and empiricism. This paper presents a 2-D finite element model of CPG based on the elasto-plastic theory of strain hardening that takes variations in stress–strain fields along the depth and the impact of the ground surface conditions on the grouting process. This reveals densification and confining aspects of CPG with relative contribution of variables like injection pressure, spacing of injection points, overburden pressure and initial relative density of ground. This paper concludes that the ground improvement by CPG should not be taken as increased ground density alone but also as increased lateral earth pressure. Although no densification can be achieved for medium or dense soil, CPG process is found to be effective in increasing the lateral earth pressure of medium or dense soil significantly. The lateral earth pressure increases with increase in injection pressure only up to the some extent but with further increase in injection pressure its effect reaches to the farther radial distances.
7 citations
Cites background from "Foundation analysis and design"
...Table 2 Suggested values of Young’s modulus of soils Type of soil Es(MPa) Reference Bowles (1992) Cernica (1995) Das (1997) Budhu (2000)...
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...Table 4 Suggested values of friction angle of soils Type of soil Angle of internal friction / (deg) Reference Das (1997) /p /cv Sand: round grains Loose 28–30 26 Medium 30–35 * Dense 35–38 30 Sand: angular grains Loose 30–35 30 Medium 35–40 * Dense 40–45 35...
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...Table 3 Suggested values of Poisson’s ratio of soils Type of soil l Reference Bowles (1992) Cernica (1995) Das (1997) Budhu (2000) Rowe (2001)...
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