Determination of Loading Capacities for Bi-directional Pile Load Tests Based on Actual Load Test Results

2014 ◽  
Vol 43 (1) ◽  
pp. 20120325 ◽  
Author(s):  
Yongkyu Choi ◽  
Moon S. Nam ◽  
Tae-Hyung Kim
Keyword(s):  
Load Test ◽  
Test Results ◽  
Actual Load ◽  
Load Tests ◽  
Pile Load Tests

Performance of helical piles in oil sand

2009 ◽  
Vol 46 (9) ◽  
pp. 1046-1061 ◽  
Author(s):  
Mohammed Sakr
Keyword(s):  
Full Scale ◽  
Load Test ◽  
Test Results ◽  
Lateral Loads ◽  
Oil Sand ◽  
Deep Foundation ◽  
Helical Piles ◽  
Load Tests ◽  
Pile Load Test ◽  
Pile Load Tests

The results of a comprehensive pile load-test program and observations from field monitoring of helical piles with either a single helix or double helixes installed in oil sand are presented in this paper. Eleven full-scale pile load tests were carried out including axial compression, uplift, and lateral load tests. The results of the full-scale load tests are used to develop a theoretical design model for helical piles installed in oil sand. Test results confirm that the helical pile is a viable deep foundation option for support of heavily loaded structures. The test results also demonstrated that circular-shaft helical piles can resist considerable lateral loads.

Pile load tests for the Calgary Air Terminal building

1983 ◽  
Vol 20 (2) ◽  
pp. 353-361
Author(s):  
J. Bertok ◽  
M. Berezowski
Keyword(s):  
Technical Note ◽  
Load Test ◽  
Load Testing ◽  
Test Results ◽  
Concrete Piles ◽  
Building Foundation ◽  
History Of ◽  
Load Tests ◽  
Pile Load Tests ◽  
Pile Type

This technical note describes a case history of pile load tests for the Calgary Air Terminal building. One drilled, cast-in-place, concrete caisson, socketed into bedrock, and compacted expanded-base concrete piles were tested and evaluated to select a pile type that would support column loads up to 6700 kN. This note describes the pile test program, interprets the load test results, and summarizes the pile specifications and installation. Keywords: building foundation, piles, load testing, interpretation, installation.

Predicting the Ultimate Bearing Capacity of Single Piles Based on CPTU

2011 ◽  
Vol 243-249 ◽  
pp. 4402-4407
Author(s):  
Yong Hong Miao ◽  
Guo Jun Cai ◽  
Song Yu Liu
Keyword(s):  
Load Test ◽  
Load Testing ◽  
Pile Capacity ◽  
Piezocone Penetration Test ◽  
Load Carrying ◽  
Load Tests ◽  
Pile Load Test ◽  
Single Piles ◽  
Pile Load Tests ◽  
Best Fit

Six methods to determine axial pile capacity directly based on piezocone penetration test (CPTU) data are presented and evaluated. Analyses and evaluation were conducted on three types piles that were failed during pile load testing. The CPT methods, as well as the CPTU methods, were used to estimate the load carrying capacities of the investigated piles (Qp ). Pile load test were used to determine the measured load carrying capacities (Qm). The pile capacities determined using the different methods were compared with the measured pile capacities obtained from the pile load tests. Two criteria were selected as bases of evaluation: the best fit line for Qp versus Qm and the arithmetic mean and standard deviation for the ratio Qp /Qm. Results of the analyses showed that the best methods for determining pile capacity are the CPTU methods.

A note on pile load test interpretation

1970 ◽  
Vol 7 (4) ◽  
pp. 479-481
Author(s):  
K. Peaker
Keyword(s):  
Soil Type ◽  
Test Procedure ◽  
Load Test ◽  
Building Code ◽  
Test Interpretation ◽  
Load Tests ◽  
Pile Load Test ◽  
Pile Load Tests ◽  
Pile Type

Pile load tests are normally carried out in accordance with A.S.T.M. or other building code specifications without regard to the actual pile type or soil type. The example quoted indicates that the test procedure may lead to incorrect interpretation of failure and conservative design.

The Effect of Specimen's Height on the Point Load Test

2013 ◽  
Vol 848 ◽  
pp. 108-111 ◽  
Author(s):  
Jin Kui Li ◽  
Fei Fei Li ◽  
Xian Ke Wei
Keyword(s):  
Point Load ◽  
Load Test ◽  
Test Results ◽  
Strength Index ◽  
Underground Engineering ◽  
Point Load Strength ◽  
Size And Shape ◽  
Point Load Test ◽  
Specimen Height ◽  
Load Tests

In order to use different size of the rock in the site point load tests, select the same site at the scene of specimen do load test research. Through the statistical analysis of 9 groups of the point load strength index data, demonstrates the influence of the test specimen size and shape sample size and shape to rock point load test results, and draws the influence rule of the specimen height to the point load test. The research has the vital significance for underground engineering design and construction.

scholarly journals Large-diameter helical pile capacity – torque correlations

2017 ◽  
Vol 54 (7) ◽  
pp. 968-986 ◽  
Author(s):  
Jared Harnish ◽  
M. Hesham El Naggar
Keyword(s):  
Large Diameter ◽  
Failure Criteria ◽  
Load Test ◽  
Ultimate Capacity ◽  
Pile Capacity ◽  
Shearing Resistance ◽  
Helical Piles ◽  
Torque Capacity ◽  
Load Tests ◽  
Pile Load Tests

Large-diameter helical piles are utilized increasingly to support heavy structures. Both the magnitude of the required installation torque and the pile capacity can be directly attributed to the soil shearing resistance developed over the embedded area of the pile including the shaft and helical plates. Hence, the pile capacity can be correlated to installation torque. Such correlations are widely used in the helical pile industry as a means for quality control and quality assurance. In the current study, a total of 10 test piles were installed while monitoring the installation torque continuously with depth. The recorded installation torque profiles were demonstrated to be accurate and repeatable. Field pile load tests were conducted and their results were analyzed to determine the interpreted ultimate capacity of the test piles. The results demonstrate that the ultimate capacity of large-diameter helical piles can be interpreted from pile load test data employing the failure criteria proposed by Elkasabgy and El Naggar in 2015 and Fuller and Hoy in 1970. The measured installation torque and corresponding ultimate capacity values were employed to define torque–capacity correlation (Kt) based on embedded pile area. It was demonstrated that the proposed Kt is suitable for large-diameter helical piles.

scholarly journals ANALYSIS OF STATIC AND DYNAMIC DEFORMATION MODULUS

2016 ◽  
Vol 8 (2) ◽  
pp. 79-84 ◽  
Author(s):  
Mindaugas Mikolainis ◽  
Marijus Ustinovičius ◽  
Danutė Sližytė ◽  
Tatyana Zhilkina
Keyword(s):  
Soil Compaction ◽  
Dynamic Deformation ◽  
Deformation Modulus ◽  
Load Test ◽  
Test Results ◽  
Plate Load Test ◽  
Test Execution ◽  
Load Tests ◽  
Different Depths ◽  
Result Interpretation

This article summarises dynamic deformation modulus correlation with second reload of static plate load test results for an even thickness soil strata layer. An analysis of execution and result interpretation of both static deformation modulus and dynamic deformation modulus is provided also. Different correlations between the two modulus according to different authors are provided. Since dynamic plate load test is not regulated in Lithuania as a soil compaction contron method, a few dynamic plate load tests and static plate load tests were executed in order to compare compaction results. The additional experiments for dynamic plate load tests in different depths were executed which showed that deformation modulus is dependant on depth of test execution, thus it is worthwile to mention to be cautious on compaction results in trenches.

scholarly journals Within-site variability and reliability of foundation designs based on load tests

2019 ◽  
Author(s):  
◽  
Andrew Z. Boeckmann
Keyword(s):  
Load Test ◽  
Test Results ◽  
Considerable Variability ◽  
Specific Load ◽  
Primary Input ◽  
Bayesian Techniques ◽  
Test Information ◽  
Load Tests ◽  
A Site ◽  
Site Variability

Probabilistic evaluations of the reliability of foundation designs based on site-specific load test information are somewhat limited in number. Published evaluations have generally relied on Bayesian techniques. A primary input for Bayesian analysis is within-site variability, which describes the variability of foundation resistance across a site. Within-site variability is attributed to geologic variation across a site and to differences in construction outcomes among foundation elements. Published evaluations have generally used a deterministic value of within-site variability wherein within-site variability is treated as a known parameter and is not subject to updating based on load test results. In contrast, probabilistic within-site variability treats within-site variability as an uncertain parameter with its own probability distribution that is updated based on load test results. Probabilistic within-site variability has not been applied commonly. This research examines differences in reliability outcomes between deterministic and probabilistic within-site variability. Analysis of micropile load test results from five different sites was used to develop a distribution of within-site variability. The resulting distribution is relatively variable (i.e. the value of within-site variability is, itself, variable), which demonstrates that there is, in fact, considerable variability and uncertainty in the value of within-site variability.

A new socket roughness factor for prediction of rock socket shaft resistance

2001 ◽  
Vol 38 (1) ◽  
pp. 138-153 ◽  
Author(s):  
J P Seidel ◽  
B Collingwood
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Resistance Coefficient ◽  
Complex Problem ◽  
Load Test ◽  
Technical Literature ◽  
Analysis And Design ◽  
Shaft Resistance ◽  
Load Tests ◽  
Pile Load Tests

Prediction of rock socket shaft resistance is a complex problem. Conventional methods for predicting the peak shaft resistance are typically empirically related to unconfined compressive strength through the results of pile load tests. It is shown by reference to international pile socket databases that the degree of confidence which can be applied to these empirical methods is relatively low. Research at Monash University has been directed at understanding and then modelling the complex mechanisms of shear transfer at the interface between the socketed piles and the surrounding rock. Important factors that affect the strength of pile sockets have been identified in laboratory and numerical studies. With a knowledge of the effect of these factors, the reasons for the large scatter around traditional empirical correlations can be deduced. A computer program called ROCKET has been developed which encompasses all aspects of the Monash University rock socket research. This program has been used to develop design charts for rock-socketed piles based on unconfined compressive strength and a nondimensional factor which has been designated the shaft resistance coefficient (SRC). Implementation of the SRC method in design requires an estimate of the likely socket roughness to be made. Very few researchers or practitioners have measured socket roughness, so there is little available guidance in selection of appropriate values. Although many socket load tests are described in the technical literature, the physical parameter which is regularly missing is the socket roughness. With a knowledge of the shaft resistance, and an estimate of all other relevant parameters, the authors have been able to back-calculate the apparent socket roughness using the SRC method. Based on the back-calculated roughness data, socket roughness guidelines for use in analysis and design of rock sockets have been proposed. Using these roughness guidelines, it is shown that the SRC method is able to predict the scatter observed in previously published international load test databases.Key words: rock socket, drilled shaft, shaft resistance, roughness, shaft resistance coefficient.

Parametric analysis of the effects of stress relief on the performance and capacity of piles in nondilative soils

2011 ◽  
Vol 48 (9) ◽  
pp. 1354-1363 ◽  
Author(s):  
Gang Zheng ◽  
Yu Diao ◽  
C.W.W. Ng
Keyword(s):  
Ground Surface ◽  
Stress Relief ◽  
Load Test ◽  
The Other ◽  
Deep Excavation ◽  
Maximum Tension ◽  
Load Tests ◽  
Pile Load Test ◽  
Effects Of Stress ◽  
Pile Load Tests

To provide support to superstructure and substructure, piles are often installed beneath a deep basement prior to its excavation. However, the effects of stress relief on the performance and capacity of piles due to deep excavation are rarely reported in the literature. In this study, two different types of pile load tests were simulated with and without considering excavation effects by conducting parametric axisymmetric finite element analyses. The first test was a pile load test on a sleeved pile from the ground surface prior to deep excavation, and the other is a load test on an unsleeved pile at the final excavated level. It is found that an excavation could reduce the pile capacity by up to 45% and pile stiffness by up to 75%. The effects of stress relief due to an excavation increase with normalized excavation depth (H/L) and excavation radius (R/H). Moreover, the maximum tension induced in a pile by excavation varies with H/L, and it has a peak value when 1 < H/L < 1.25. The value of maximum tension increases with the pile–soil modulus ratio (Ep/Esm). When Ep/Esm = 100, peak tension develops at 0.5H. On the other hand, tension reaches a peak at 0.7H when Ep/Esm = 20.

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