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The paper presents an attempt to identify functional dependence for determining a course of changes in general porosity of uniaxially loaded soil sample in the function of the exerted unit pressure. On the basis of laboratory examinations performed on samples formed from 4 varieties of soils, it has been found out that this dependence can be imitated, in the examined range of unit pressure changes, with a logarithmic function. The influence of a set of independent variables which characterize the deformed soil material and conditions in which the process of deformation occurs, on the value of the coefficints of this function was examined with the method of multiple regression analysis. The worked out regression models allow to determine coefficient values on the basis of the few parameters, not used so for as variables, and which in the majority of experiments appear as constant parameters, namely: initial porosity, dimensions of samples, indices describing soil texture, deformation velocity.
Determination of boundary stress by using Casagrande graphical method is labour-consuming and some difficulties are connected with visual evaluating the shape of soil deformation experimental curve. The programme for computing boundary stresses was designed on the basis of Lotus 123 calculation sheet to eliminate mentioned difficulties. The programme is based on evaluating the run of curve using absolute values of curvature index calculated from the difference of left-sided differential quotients. Presented procedure enables processing the series of measured values recorded at ASCII form. Model was verified experimentally by using the test where boundary stresses were determined in uniaxially deformed soil samples. Model soil samples consisted of the mass of loose soil aggregates 1-8 mm diameter, were put into rigid steel cylinders 80 mm diameter and compacted at 200 kPa pressure. Soil of heavy clay mechanical structure was used in the experiment. The results confirmed correctness of developed model and its usability for computing boundary stresses.
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