An investigation to determine the bearing capacity of driven piles and pressed friction pile using practical method

This article considers the question of the necessity of soil porosity coefficient in determining the bearing capacity of vertically loaded driven and pressed pile (vertical load) by analytical method using the calculated values of soil resistance on the pile’s side surface and under its toe, defined by the tables of standard documents (practical method). Statistical analysis, based on the theory of planning experiments, shows that additional consideration of the soil porosity coefficient allows to increase the accuracy of calculation of pile bearing capacity, which is confirmed by the results of field tests of piles and cone penetration tests of soils. It is shown that, depending on the soil porosity coefficient, the bearing capacity of a vertically loaded pile can vary up to 2 times. To calculate the load-bearing capacity of driven and pressed piles by the analytical method based on the results of engineering and geological surveys taking into account the soil porosity coefficient, the method developed on the basis of Z. Sirojiddinov’s probabilistic-statistical processing of test results by vertical static load testing on a large number of piles in various soil conditions is recommended.