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Journal ArticleDOI

Bearing capacity of auger-cast piles in sand

01 Feb 1991-Journal of Geotechnical Engineering (American Society of Civil Engineers)-Vol. 117, Iss: 2, pp 331-345
TL;DR: In this paper, the results of 66 loading tests on auger-cast piles in sand are presented, showing that shaft resistance is independent of the relative density of the sand, while point resistance can be directly correlated with results of standard penetration and cone penetrometer tests.
Abstract: Auger‐cast piles are formed by drilling a continuous flight auger into the ground and, on reaching the required depth, pumping grout or concrete down the hollow stem as the auger is steadily withdrawn. The sides of the hole are supported by the soil‐filled auger, eliminating the need for temporary casing or bentonite slurry. This paper outlines important features of auger‐cast pile installation that influence the structural integrity and geotechnical capacity of completed piles. These include soil decompression, correlation between the rotational and vertical speeds of the auger, and precise coordination of auger extraction and grout supply. The results of 66 loading tests on auger‐cast piles in sand are presented. Shaft resistance is found to be independent of the relative density of the sand, while point resistance can be directly correlated with results of standard penetration and cone penetrometer tests. Empirical design methods for bored piles were found to underestimate the failure loads of auger‐ca...
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14 Nov 2012
TL;DR: In this article, the authors present a systematic approach to modelling pile responses in the context of load transfer models, an approach that leads to methods that require fewer parameters but can potentially solve more problems.
Abstract: Pile foundations play an essential role in many structures, therefore it is vital that they be designed with the utmost reliability. The cost of failure is potentially huge. Covering a whole range of design issues relating to pile design, Theory and Practice of Pile Foundations presents economical and efficient design solutions and demonstrates them using real-world examples. The author presents his systematic approach to modelling pile responses in the context of load transfer models—an approach that leads to methods that require fewer parameters but can potentially solve more problems.

66 citations

Journal ArticleDOI
TL;DR: In this article, a jetted and grouted precast precast pile is presented, which uses the advantages of several proven deep foundation installation techniques, such as drill shafts, conventional and post grouted tip, and continuous flight auger piles.
Abstract: With increased urbanization, deep foundation (bridges, signage, walls, etc) selection is moving toward the minimization of disturbance and installation time, as well as addressing quality control and assurance issues Unfortunately, many types of deep foundations involve noise and vibration during installation (eg, driven piles) or integrity and reduced resistance issues (eg, drilled shafts, both conventional and post grouted tip, continuous flight auger piles) This paper presents a new foundation type, a jetted and grouted precast pile, which uses the advantages of several proven deep foundation installation techniques The installation of the new pile is comprised of three distinct phases: (1) pressurized water-jetting of a precast pile into the ground; (2) side grouting of the pile; and (3) tip grouting The pile has two separate side grouting zones, each with its own grout delivery system Each grout zone is covered with a semirigid membrane, which results in radial expansion of the soil

39 citations

01 Jan 2007

36 citations


Cites background or methods from "Bearing capacity of auger-cast pile..."

  • ...Eight methods for static capacity were evaluated using this database: Viggiani (1993), Reese and O’Neill (1988), LPC (1981), Wright and Reese (1979), Rizkalla (1988), Coyle and Castello A-17 (1981), Douglas (1983), and Neely (1991)....

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  • ...83 NeSmith (2002) studied the results of 22 full-scale compression load-tests and six full-scale pullout tests of DD piles located at 19 different sites throughout the United States....

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  • ...Five methods were evaluated: Wright and Reese (1979), Neely (1991), LPC (1981), original FHWA (Reese and O’Neill, 1988); and Coyle and Castello (1981)....

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  • ...This relationship verified the common belief of a decreasing α with increasing Su, as shown below in Figure A.2....

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  • ...Section A.2.10 of Appendix A contains further details of the test program....

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01 Sep 2012
TL;DR: In this article, a report regarding treatment methods for controlling settlements of approach slabs of new bridge construction is presented, with the first part concerned the compiling and presentation of documented information while the second part dealt with field evaluation of methods to reduce settlement.
Abstract: Report regarding treatment methods for controlling settlements of approach slabs of new bridge construction. The report is presented in two parts, with the first part concerns the compiling and presentation of documented information while the second part deals with field evaluation of methods to reduce settlement.

30 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe the addition of static loading test results to a global augered cast-in-place pile data set to assess the accuracy of new and existing design methods.
Abstract: Although a variety of methods exist to estimate axial capacity for augered cast-in-place piles, they are generally limited to allowable stress design (ASD) procedures, with little consideration of design reliability. This paper describes the addition of static loading test results to a global augered cast-in-place pile data set to assess the accuracy of new and existing design methods and to address the current lack of reliability-based design methods for augered cast-in-place piles. The new static loading tests in western Washington were carried out on piles installed in granular materials, with pile diameters and lengths ranging from 0.41 to 0.51 m and 9.5 to 29 m, respectively. The preparation of beta coefficients and unit toe bearing resistance values is discussed within the framework of strain-dependent composite tangent moduli and observed residual loads. New relationships for the beta coefficient and toe bearing resistance values are proposed, and the accuracy of new and existing design pro...

29 citations

References
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Journal ArticleDOI
G. G. Meyerhof1
TL;DR: In this paper, the bearing capacity of longer piles can be estimated from the limiting values of the point resistance and skin friction using either the friction angle of the soil or preferably the results of static and standard penetration tests directly.
Abstract: Conventional bearing capacity of driven and bored piles in sand and nonplastic silt is limited to short piles above the critical depth of penetration. The bearing capacity of longer piles can be estimated from the limiting values of the point resistance and skin friction using either the friction angle of the soil or preferably the results of static and standard penetration tests directly. For driven and bored piles in clay and plastic silt, conventional bearing capacity theory using the undrained shear strength of the soil represents mainly the failure condition at the pile points. The positive and negative shaft resistance some months after pile installation is governed by the drained shear strength of remolded soil and can be estimated from skin friction factors, provided the earth pressure coefficient at rest of the deposit is known. The ultimate load of pile groups and the settlement of pile foundations are examined.

612 citations

Journal ArticleDOI
TL;DR: In this article, the authors deal with the prediction of the response to monotonic axial loading of single piles in various soil conditions, and evaluate 13 methods to predict the ultimate load of a pile and five methods designed to predict its settlement.
Abstract: This article deals with the prediction of the response to monotonic axial loading of single piles in various soil conditions. A 98-pile load test data base was obtained from the Mississippi State Highway Department and was used to evaluate 13 methods designed to predict the ultimate load of a pile and five methods designed to predict the settlement of a pile. The methods include SPT/\IS\du\N methods, cone penetrometer methods, a pressuremeter method, and a dynamic formula method. The accuracy and precision of each method is quantified statistically, and a risk analysis is performed in order to properly assess the factor of safety. A cost analysis is also performed in order to find the factor of safety that will minimize the cost of construction plus the cost of a potential failure.

183 citations

Journal ArticleDOI
TL;DR: In this article, a method for estimating equivalent standard penetration test (SPT) N −values from Cone Penetration Test (CPT) data has been presented accounting for variations in soil grain size and SPT energy input.
Abstract: A method for estimating equivalent Standard Penetration Test (SPT) N‐values from Cone Penetration Test (CPT) data has been presented accounting for variations in soil grain size and SPT energy input. A discussion is given regarding the problems associated with the SPT and how these relate to SPT‐CPT correlations. A historical review of SPT‐CPT correlations is presented with additional recent data that include energy measurements during the SPT. An example is given to illustrate how the SPT data can be rationalized using energy corrections. Also, a chart is provided to estimate mean grain size from CPT data.

168 citations

Journal ArticleDOI
TL;DR: In this paper, a critical review of the literature clearly shows that existing theories which are used to determine the bearing capacity of piles driven in sand are not satisfactory Careful examination of the results of experimental studies indicates that existing theory fail to consider all significant parameters.
Abstract: A critical review of the literature clearly shows that existing theories which are used to determine the bearing capacity of piles driven in sand are not satisfactory Careful examination of the results of experimental studies indicates that existing theories fail to consider all significant parameters Field load test data are used to determine which of the pile geometry and soil property parameters are significant Special attention is given to the problem of residual stresses Bearing capacity factors are calculated from measured unit point and side resistances The bearing capacity factors are correlated with relative depth (depth of penetration to diameter ratio) and friction angle or relative density of sand New design correlations are developed for use in predicting the bearing capacity of axially loaded piles in sand

124 citations