Foundation analysis and design

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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.

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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•DOI•

Relative density concept is not a reliable criterion

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Babak Hamidi, Serge Varaksin, Hamid Nikraz

01 May 2013

TL;DR: The concept of relative density has no real influence on the soil's performance, its range of application does not span across all soil types, and it is subject to large inherent errors that make its use a technical risk as mentioned in this paper.

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Abstract: Many years ago, a new concept called relative density was developed with the intention of appropriately defining the looseness and denseness of sand or sand–gravel soils in a meaningful way. Soon after, relative density found its way into ground improvement as an acceptance criterion by engineers who were more familiar with the construction of engineered backfilling rather than thick mass treatment. There are considerable amounts of research and publications that are able to well demonstrate the unreliability of relative density as an acceptance criterion. Relative density has no real influence on the soil's performance, its range of application does not span across all soil types, and it is subject to large inherent errors that make its use a technical risk. Here, the reasons why the concept of relative density is unreliable and should not be used for a ground improvement acceptance criterion are presented and discussed.

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6 citations

Cites background from "Foundation analysis and design"

...Likewise, Bowles (1996) states that in his opinion, the relative density test is not of much value because it is difficult to obtain maximum and minimum unit weight values within a range of about 0.5 kN/m3: Herein, the authors will review the limitations and the unreliability of the concept of…...
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...Likewise, Bowles (1996) states that in his opinion, the relative density test is not of much value because it is difficult to obtain maximum and minimum unit weight values within a range of about 0....
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Journal Article•DOI•

Development of Graphical Method of Pile Group Foundation Design

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Noegroho Djarwanti¹, Raden Harya Dananjaya¹, Fauziah Prasetyaningrum¹•Institutions (1)

Sebelas Maret University¹

01 Jul 2016-Applied Mechanics and Materials

TL;DR: In this article, the authors study the correlations of groups of piles efficiencies with the number of piles and compare the groups of pile capacities with the single piles capacities using a proposed graphical method.

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Abstract: In the construction projects, a pile group foundation is often utilized. The group of bored piles is usually installed relatively close to each other and joined at the top by a pile cap to hold up the loads. In other hand, a fast estimation of the groups of piles capacities are needed in the preliminary design and in other conditions of projects, such as a supervisor of projects want to estimate the capacities of the group of piles. The purpose of this research is to study the correlations of groups of piles efficiencies with the number of piles and to compare the groups of piles capacities with the single piles capacities. Furthermore, this study is aimed to make a fast estimation of groups of piles capacities using proposed graphical method.The piles efficiencies are calculated using several methods, such as Simplified Analysis, Converse-Labare [1][2], Los Angeles Group, Seiler - Keeney, Das, and Sayed - Baker. In order to calculate the groups of piles capacities, the capacities of single piles are needed. The singles piles capacities are taken from graphical method proposed by Djarwanti et al. (2015a and 2015b). Three graphical methods utilized are derived from the Briaud et al. (1985) , Reese and Wright (1977), and Reese O’Neill method. Moreover, the proposed graphical method is applied in the case study. The case study takes palace in Graha Indoland Condotel Inside Yogyakarta Construction Project.The pile efficiency graph is recommended for this research since the value of pile efficiency could be easily taken. The value of pile efficiency for Graha Indoland Condotel Inside using Simplified Analysis, Converse - Labare, Los Angeles Group, Seiler – Keeney, Das, and Sayed – Baker are 1,75; 0,89; 0,94; 0,99; 4,00; 1,56 respectively. Meanwhile the value of pile group capacity with the value of pile group efficiency more than 1, showed that the pile group capacity based on the efficiency is bigger than the one based on single down pattern.

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6 citations

Cites background or methods from "Foundation analysis and design"

...Qu = single pile capacity (kN) Qb = end bearing capacity of pile (kN) Qs = skin friction capacity of pile (kN) Various methods had been proposed to estimate the ultimate capacity of single piles, such as Reese and O’Neill (1989 in Das[2], Terzaghi and Peck, Meyerhof (1976 in [2] and [6]), etc....
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...Meyerhof (1976 in [2] and [6]), Reese and Wright (1977), and Briaud et al....
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Dissertation•

Stabilization of Natural Clay Riverbanks with Rockfill Columns: A Full-Scale Field Test and Numerical Verification

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Kendall Thiessen

19 Jan 2011

6 citations

Cites background from "Foundation analysis and design"

...A Poisson’s ratio of 0.4 falls at the low end of the range reported by Baracos et al. (1983) and Bowles (1997), although it is not clear whether they are reporting a value for drained or undrained conditions....
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Support for offshore monopile installation through the trench cutter technology

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Giovanni Spagnoli, Leonhard Weixler

01 Jan 2013

TL;DR: In this article, the authors describe the trench cutter technology normally used for foundation works on land and discuss three case histories onshore and one offshore project are discussed and the evolution of the trench-cutter technology for supporting the installation of offshore monopile is described.

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Abstract: Europe is currently facing an energetic revolution. Several offshore wind farm projects are currently under construction or under planning in North and Baltic Sea. Typical foundation structures for offshore wind farms are steel open-ended monopiles with large diameters up to 6 m. Currently, the monopiles are installed by driving with large impact hammers. However, there are many situations where pile refusal is reached, due to hard soil layers or erratic blocks. Driving and drilling technique is therefore applied. This manuscript briefly describes the trench cutter technology normally used for foundation works on land. Three case histories onshore and one offshore project are discussed and the evolution of the trench cutter technology for supporting the installation of offshore monopile is described.

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6 citations

Flow Control and Design Assessment for Drainage System at McMurdo Station, Antarctica

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Rosa T. Affleck, Meredith L. Carr, Brendan A. West

24 Nov 2014

TL;DR: In this article, the authors studied the management of flow, minimizing erosion and improving the drainage system at McMurdo Station by modeling high flows, designing control measures, and evaluating existing culvert and snow dump locations.

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Abstract: : Runoff at McMurdo Station is driven primarily by the melting of snow and glacier ice. Snowmelt runoff passes through McMurdo via a system of drainage ditches, gullies, and culverts. Ultimately, the snowmelt runoff discharges into Winter Quarters Bay and McMurdo Sound through several discharge points. Although the most extreme runoff, during heavy flow has not been measured, we have observed that the runoff mobilizes sediment, erodes the drainage channels and embankments, and overflows onto roads. The objectives of this study were to manage flow; to minimize erosion; and to improve the drainage system by modeling high flows, designing control measures, and evaluating existing culvert and snow dump locations at McMurdo Station. Flow modeling and structural analyses were conducted to determine design parameters for control measures, including rock and wooden weirs; to evaluate various design alternatives against erosion control metrics; to evaluate culvert conditions; and to investigate an alternative flow path and sediment ponds. A qualitative review of culvert conditions and snow dump locations was also performed. This report identifies specific mitigation recommendations using these control measures, which will help prevent future overflow and deterioration of the McMurdo drainage system.

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6 citations

Cites background from "Foundation analysis and design"

...5 kip/ft2] for dense gravel) to the force per unit area of the weir’s weight must be greater than one so as to make sure that the ground can withstand the force of the weir’s weight (Bowles 1996; British Standards Institute 1986)....
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...…states that the ratio of the gravel bearing capacity (600 kPa [12.5 kip/ft2] for dense gravel) to the force per unit area of the weir’s weight must be greater than one so as to make sure that the ground can withstand the force of the weir’s weight (Bowles 1996; British Standards Institute 1986)....
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Foundation analysis and design

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