scholarly journals Determination of the Pile Stiffness Matrix Based on the Pile Load Test Results and the Effect of Pile Interaction

2020 ◽  
Vol 27 (6) ◽  
Keyword(s):  
Stiffness Matrix ◽  
Load Test ◽  
Test Results ◽  
Pile Interaction ◽  
Pile Load Test

scholarly journals A Local Design Method for Pile Foundations

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Nunzia Letizia ◽  
Chiara Iodice ◽  
Alessandro Mandolini
Keyword(s):  
Design Method ◽  
Load Test ◽  
Preliminary Design ◽  
Test Results ◽  
Reasonable Accuracy ◽  
Case Histories ◽  
Original Design ◽  
Settlement Ratio ◽  
Pile Load Test ◽  
The One

The work at hand attempts to propose a local pile design method based on pile load test results for a reference site. Such LPDM is simply based on the identification of three dimensionless quantities, such as the capacity ratio CR, the stiffness ratio SR, and the group settlement ratio Rs. To prove the LPDM reliability, experimental data collected during years in the Neapolitan area (Italy) have been used to obtain the abovementioned coefficients. Then, LPDM has been applied, as a preliminary design method, to three well-documented case histories applying capacity and settlement-based design (CBD and SBD) approaches. The satisfactory agreement between the geometry in the original design of piles and the one obtained by applying the LPDM proves that the proposed methodology may be very helpful for preliminary design, allowing for reasonable accuracy while requiring few hand calculations.

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.

scholarly journals Cross hole sonic test results for analysis of pile load test

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Swapan Kunar Bagui ◽  
S. K. Puri ◽  
K. Subbiah
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Wide Band ◽  
Load Test ◽  
Test Results ◽  
Pile Capacity ◽  
Uniform Cross Section ◽  
Cell Test ◽  
Pile Load Test ◽  
Sonic Logging

AbstractQuality of concrete for pile can be checked using Cross-hole Sonic Logging (CSL) Test. A processing method wide-band CSL data is presented herein. First Time Arrival (FTA) is an important consideration. In pile capacity analysis or CSL analysis, it is assumed that pile cross section is uniform with uniform value of elastic modulus of concrete but in real practice both are non-uniform. The procedure identifies the location accuracy and further characterizes the features of the defect. FTA is used to find out the location of the distress in the pile. This method identifies the exact location of any void or defect inside the rebar cage of a drilled shaft. This method provides a significant improvement to current techniques used in quality control during construction of bridges. In this present paper, the analysis has been carried out based on uniform and non-uniform values of pile cross section and E value of concrete. Cross hole sonic and pile load test using O-Cell were carried out on same pile at 7 and 28 days of concreting. Same pipes were used for base grout after cross hole sonic test. These results were used to analyze O-cell test results based on a case study and presented in this paper. The distribution of skin frication and skin friction force has also been presented herein with both uniform and non-uniform cross section and E values of concrete. Based on the field test results and analysis a simplified methodology, has been proposed in this paper, for development of Equivalent Top Down Loading with consideration of elastic shortening of pile and surrounding soil for both cases i.e., uniform and non-uniform E values and pile cross sections.

scholarly journals Analysis of the pile skin resistance formation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Paweł Siemaszko ◽  
Zygmunt Meyer
Keyword(s):  
Static Load ◽  
Skin Resistance ◽  
Interaction Mechanism ◽  
Load Test ◽  
Engineering Practice ◽  
Test Results ◽  
Detailed Data ◽  
Static Load Test ◽  
Practical Engineering ◽  
Pile Interaction

Abstract This paper introduces a method based on a static load test which is aimed to verify the mechanism of the piles soil–skin interaction. The authors base their analysis on detailed data from static load test with extensometers on CFA piles. The main goal of the research is to determine the proper method of examining how the skin of the pile and soil interacts and apply it to practical engineering practice. As the first stage of the research is limited to the available set of piles, the authors make assumptions that will be verified on later stages of research as more data become available. The authors attempt to formulate the boundary conditions for the formation of pile skin resistance formation using mathematical physics equations to describe the phenomena. Current research proves that it is possible, with the suitable for practical engineering calculations, to describe soil–pile interaction mechanism based on static load test results. Experimental research indicated that there is possibility, for practical engineering calculations purposes, to assume that skin resistance of the pile due to depth can be presented with linear graph. The description is made upon extensometer results, but is meant to be appropriate with the standard static load test results, which provide load–settlement curve of the pile.

The determination of rock mass modulus variation with depth for weathered or jointed rock

1982 ◽  
Vol 19 (1) ◽  
pp. 29-43 ◽  
Author(s):  
R. K. Rowe
Keyword(s):  
Rock Mass ◽  
Jointed Rock ◽  
Load Test ◽  
Test Results ◽  
Plate Load Test ◽  
Worked Example ◽  
Single Plate ◽  
Rock Mass Modulus ◽  
Second Procedure

Weathering or the variation in frequency and tightness of joints may result in an increase in mass modulus with depth for some rocks. This increase in modulus will continue until a depth is reached at which the rock behaves as a sound intact unit and the modulus will be relatively constant with depth below this point. In this paper, elastic solutions are presented for the deformation of such a rock mass due to a uniform or approximately rigid circular loading.Two procedures are described for determining the rock mass modulus profile from plate load test results. The first procedure uses the results from three plate tests to infer the variation in modulus with depth. The second procedure uses the measured variation in displacement with depth below a single plate to infer the mass modulus variation. The application of the two procedures is illustrated by a worked example and by consideration of a field case where the inferred modulus is shown to be in good agreement with alternative modulus variation data.

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