CPT data for the bearing capacity of piles with variable section calculation

Results of elaborating an engineering method of tapered piles calculation in clayey soils from CPT data are given. CPT data of in-situ tapered piles equipped with strain-gauges are reviewed as well as data of CPT in place of test pile manufacturing. By means of mathematical processing of experimental data the empirical dependences for determination of transfer coefficient from a probe to a pile as a function of relative depth of deposited layer are obtained. Calculation scheme is worked out and formulas for tapered pile bearing capacity evaluation are obtained, in which design soil parameters are defined from CPT data.