4 - Geotechnical parameters from CPT records

Abstract

This chapter highlights one of the most common and popular in situ tests, CPT. The applicability of CPTu for deriving soil parameters is more than the other common in situ tests. Empirical correlations, simplified analytical methods, numerical analyses, and soft computing in data handling have been suggested to relate the CPT-based geotechnical soil parameters to foundation engineering as a function of cone tip resistance (qc) and shaft friction resistance (fs) and u2 (excessive pore pressure). A complete discussion of soil parameters' assessment using CPT records is covered over foundation issues via tables and figures. In this chapter, correlations for (1) design geotechnical parameters induced bearing capacity: unit weight (γ), relative density (Dr), internal friction angle (φ), undrained shear strength (Su), over consolidation ratio, stiffness parameters of soil (E), and constrained modulus (mv), (2) other geotechnical soil characterization: shear wave velocity (Vs) and small strain shear modulus (G0), sensitivity (St), CPT correlation with standard penetration test, and permeability (k) are considered. Moreover, empirical deterministic correlations as a main method to approximate liquefaction potential are offered. Finally, this chapter concludes with example solution section.