Clarification of correlation dependences between the parameters of cone penetration test and strength and deformation characteristics of soils

Abstract

The relevance of the research is caused by the increasing use of the method of cone penetration test, including the use for determining the characteristics of soils directly in the field. The main aim of the research is to construct the correlation dependences between the parameters of cone penetration test and the strength and deformation characteristics of different types of soils distributed in the territory of Kazan. Objects: dispersive soils and soil massifs on the territory of Kazan. Methodology: analysis of domestic and foreign research, cone penetration test, laboratory studies of soil properties, statistical processing of test results. Results. On the example of soils common in the territory of Kazan, the possibility of determining the strength and deformation characteristics of soils using the cone penetration test with the reliability necessary for the design of construction objects is shown. It is shown that the problem can be solved by refining the correlation dependences of the form E=f(q), f=f(q) and С=f(q), available in regulatory documents for the soil conditions of the study area. This conclusion is based on processing the results of more than 3000 points of cone penetration test passed to a depth of 28 m, drilling wells up to a depth of 30 m, as well as laboratory tests of soil samples to determine the strength and deformation characteristics. Comparison of field and laboratory test data for different types of soils showed that the values of mechanical characteristics obtained from cone penetration test data are often overestimated. This problem can be solved by creating regional dependencies in the field of cone penetration test of soils, which will improve the accuracy of the obtained engineering and geological data.