Efficiency of piles of various cross-sectional forms

Abstract

According to the authors the lack of evaluation methods for efficiency of pile behavior leads to an increased degree of randomness in the selection of type, material, shape and placement of piles, and, as a consequence, to overspending the material, energy, labor costs and, respectively, to more expensive construction. The work is devoted to the determination of the efficiency of piles of various cross-sectional forms (round, square, cross- shaped, T-shaped and double tee forms). A number of methods and criteria for quantitative evaluation of the efficiency of piles were proposed. Furthermore, the results of studies of the pile efficiency depending on the driving depth at the above-mentioned forms of cross-sections were given. Researches have shown that quantitative values of pile efficiency are approximately the same for the following forms for round and square cross-section; for T-shaped and double tee; and the are exactly the same for cross-shaped and T-shaped cross-section. Analysis of considered piles forms showed that maximum efficiency was achieved under the minimum depth of 2 meters, and then it gradually decreased. Also there was found an anomaly: at a depth of 10 meters the efficiency of cross sections with the tabs (III, IV, and V-shaped branchy) again begins to rise slowly. The results allow us to optimize more accurately the selection of the pile component in the foundation design

Multicriteria Evaluation of Building Foundation Alternatives

“…Short piles are easy to install by using the effective drilling machines. The analysis of piles of various forms has shown that maximum efficiency was achieved under the minimum depth of 2 meters, and gradually decreased later (Bulatov and Kolosova, ).…”

The Comparison of Pile Load Capacity Based on the Results of Analytical Calculations and Static Tests

“…Consequently, the question arises under the regulatory calculation method of bearing capacity of piles of reality and possibilities of its improvement. Some attempts to improve methods aimed at defining the analytical dependences existing regulations [28,29,30]. However the analysis shows that presented in these studies, depending modified variants of standard documents, therefore, no major changes to the existing methods are not followed and the end result of the analytical calculation of the bearing capacity of piles remained unchanged: in SP 24.13330 [25] for the calculation of the bearing capacity of a formula:…”

“…Another direction to minimize the differences of values of the calculated and actual bearing capacity of piles -improvement of construction technology [15,28,32]. But here, just changed the methodology of selection of equipment for piling and calculate its efficiency, which only indirectly affect the actual bearing capacity of piles.…”

Comparative Analysis of Pile Joints

“…By the method of construction piles can be monolithic -produced directly on construction sites, and prefabricated -produced on the factory. The superiority of prefabricated pile foundations particularly affects in soft soil conditions, where it is required to perform operations on dewatering for other types of foundations and even for monolithic pile foundations [2]. Moreover, it is more economy financially and in time saving because parts of such piles can be connected immediately, no need for well boring and to wait drying of construction as for monolithic one.…”