Experimental Studies and Interpretation of Penetration Logging Data

Abstract

Penetration logging data, which are obtained at field works in the form of a complex of logging diagrams, hold extensive information on the physical and mechanical properties of studied sediments, the lithological structure and content of a section, variability of properties and contents in-depth and spread of strata. Some knowledge and experience are needed for transfer of that information into the form of quantitative and qualitative data used for the calculation and design of different building constructions and geological mapping. Good knowledge of the physical and theoretical fundamentals of methods is needed for the understanding of different effects affecting the interaction of nuclear radiation with soil and rocks. And also the purpose of that information and its quantity should be clear. In this chapter different aspects of interpretation of penetration logging results and some questions of conditions for application of the methods are discussed. In particular, attention is paid to the physical processes in the ground at probe displacement and the effects of probe parameters (diameter, displacement rate, position of the friction gauge, probe dimension and so on). Finally, an estimate is made of the applicability of the theoretical solutions presented in Chap. 6 on using cone resistance and lateral friction for determination of soil mechanical properties.