Axial load transfer for piles in sand. I. Tests on an instrumented precast pile

Abstract

A precast concrete pile was driven 11.0 m into a sand deposit and subjected to three compression and one tension static loading tests. By means of strain-gage instrumentation, the loads imposed in the pile during the tests were determined. The observed load distributions appeared to suggest the existence of a critical depth. However, when the load data were supplemented with the residual load acting before the start of the tests, the appearance of critical depth disappeared. Instead, the analysis of the tests showed that the load distribution was a function of the effective overburden stresses in the soil over the full pile length, with β-ratios ranging from 0.40 through 0.65 and a toe bearing coefficient of 30. The shaft resistance degraded slightly from test to test. The shaft resistance in tension was about equal with the shaft resistance in compression. The β-ratios and the toe bearing coefficient derived from the test were applied unchanged to the results of compression tests on a second test pile, a 15 m long identical pile, and the calculated capacity agreed with the capacity found in the static loading test. Key words : instrumented pile, sand, loading test, residual load, load transfer.

Numerical Modelling of Various Aspects of Pipe Pile Static Load Test

“…Nevertheless, it is also difficult to obtain results from field tests. Accurate investigation of a real pile behaviour would require the application of instrumented piles [37,38], deeper analysis of contact effects on the pile surface [39] or model piles in calibration chambers on a geotechnical centrifuge [40][41][42]. It is clear that some recent developments of Material Point Method (MPM) [43] and Particle Finite Element Method (PFEM) [44] offer more sophisticated solutions, but the presented idea seems to be relatively easy to calibrate using SLT or pile driving reports (for precast driven piles).…”

Akurasi Penggunaan Metode Support Vector Machine (Svm) Dalam Prediksi Kapasitas Dukung Fondasi Tiang

“…Data dikumpulkan dari beberapa literatur yaitu Albiero et al (1995), Altaee et al (1992), Avasarala et al (1994), Gambini (1985), Haustorfer & Plesiotis (1988), Hill (1987), Horvitz et al (1981), Laier (1994), Mayne & Harris (1993), Nevels & Snethen (1994), Niazi & Mayne (2010), O'Neill (1986), Reese et al (1988), Robertson et al (1988), Shackelford (1995), Tucker & Briaud (1988), Tumay & Fakhroo (1981), Viergever (1982), Weber (1987), Yen et al (1989, Ebrahimian (2011) dalam Ebrahimian & Movahed (2017) serta data dari Alsamman (1995) dan Eslami & Fellenius (1997) dalam I. Alkroosh & Nikraz (2011).…”

Piles shaft capacity from CPT and CPTu data by polynomial neural networks and genetic algorithms

“…The cases were obtained from 16 sources [32,[36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] reporting data from 18 sites in 10 countries. A summary of the case information is presented in Table 2 including reference, site location, pile characteristics, pile loading test results, and soil profiles.…”