The method is based on the connection between the energy of the hammer strike and the size of the pile of pile in the ground.
The energy of the hammer strike is mainly spent on overcoming the resistance of the soil to the immersion of the pile, as well as the elastic deformations of the hammer and piles and the inevitable residual deformations.
Determining the maximum resistance of a single pile with a dynamic method gives less accurate results compared to the test of static load.. Analyzing the causes of such a discrepancy, Tikunov notes that the accuracy of the dynamic method largely depends on the quality of the formulas used for calculating the formula. e. the correctness of the hypotheses underlined the basis of their withdrawal, as well as the degree of accounting in them of real conditions, t. e. the conditions in which the pile box is produced, and from the method of measuring the refusal.
Thus, clarification and improvement of the dynamic method can be achieved by taking into account various factors, not yet taken into account.
The reliability of the results obtained is largely determined by the correctness of the application of the coefficient that in the formula of Geresvanov depends on the conditions of the clog (pile material, the design of the head of the soil, the properties of soils and other factors) and is from experience by comparing the resistance of the pile, compared by the formula, with the magnitude of the maximum resistance established Based on the results of the pile of static load.
However, different authors give various values of the coefficient P, which fluctuate from 50 to 900 t/m2. Therefore, it is necessary to carefully consider the possible boundaries of changing the transition coefficient, taking into account the “rest” pile. It is best for these purposes for the same time to conduct static and dynamic tests in parallel, allowing you to accurately determine the coefficient and then, using this coefficient, exercise control over the supporting ability of immersed piles on this construction site. For those who want to change the appearance of their home, there is a solution. The functional design of apartments will help you.