CPT-Based Probabilistic Soil Characterization and Classification

Due to lack of soil sampling during conventional cone penetration testing, it is necessary to characterize and classify soils based on tip and sleeve friction values as well as pore pressure induced during and after penetration. Currently available semiempirical methods exhibit a significant variability in the estimation of soil type. Within the confines of this paper it is attempted to present a new probabilistic cone penetration test (CPT)-based soil characterization and classification methodology, which addresses the uncertainties intrinsic to the problem. For this purpose, a database composed of normalized corrected cone tip resistance (q(t,1,net)), normalized friction ratio (F(R)), fines content (FC), liquid limit (LL), plasticity index (PI), and soil type based on the unified soil classification system was complied. Soil classification was performed by laboratory testing of the standard penetration test disturbed samples retrieved from the boreholes within mostly 2 m of each CPT hole. The resulting database was probabilistically assessed through Bayesian updating methodology allowing full and consistent representation of relevant uncertainties, including (1) model imperfection; (2) statistical uncertainty; and (3) inherent variability. As a conclusion, different sets of FC, LL, PI, and A-line boundary curves along with a new CPT-based, simplified soil classification scheme are proposed in the q(t,1,net) and F(R) domain. Probabilistic uses of the proposed models are illustrated through a set of illustrative examples.


CPT-based probabilistic and deterministic assessment of in situ seismic soil liquefaction potential
Moss, R. E. S.; Seed, R. B.; Kayen, R. E.; Stewart, J. P.; Kiureghian, A. Der; Çetin, Kemal Önder (American Society of Civil Engineers (ASCE), 2006-08-01)
This paper presents a complete methodology for both probabilistic and deterministic assessment of seismic soil liquefaction triggering potential based on the cone penetration test (CPT). A comprehensive worldwide set of CPT-based liquefaction field case histories were compiled and back analyzed, and the data then used to develop probabilistic triggering correlations. Issues investigated in this study include improved normalization of CPT resistance measurements for the influence of effective overburden stre...
Cyclic Large Strain and Induced Pore Pressure Models for Saturated Clean Sands
Çetin, Kemal Önder (American Society of Civil Engineers (ASCE), 2012-03-01)
Semiempirical probabilistic models are described to assess cyclic large strain and induced excess pore-water pressure responses of fully saturated clean sands. For this purpose, available cyclic simple shear and triaxial tests were compiled and studied. The resulting r(u) versus gamma, and gamma versus N databases are composed of 101 and 84 cyclic test data, respectively. Key parameters of the proposed r(u) and gamma models are defined as critical shear strain, relative density, effective confining stress, ...
Residual Shear Strength Measured by Laboratory Tests and Mobilized in Landslides
Mesri, Gholamreza; Huvaj Sarıhan, Nejan (American Society of Civil Engineers (ASCE), 2012-05-01)
Drained residual shear strength measured by multiple reversal direct shear or ring shear tests has been successfully used for over four decades for stability analyses of reactivated landslides in stiff clays and clay shales; A body of literature has accumulated in recent decades, claiming that "healing" or "strength regain" is realized in time on preexisting slip surfaces already at residual condition. In other words, the shear stress required to reactivate a landslide is claimed to be larger than the drain...
Sensitivity Analysis of Major Drilling Parameters on Cuttings Transport during Drilling Highly-inclined Wells
Ozbayoglu, E. M.; Miska, S. Z.; Takach, N.; Reed, T. (Informa UK Limited, 2009-01-01)
In this study, a layered cuttings transport model is developed for high-angle and horizontal wells, which can be used for incompressible non-Newtonian fluids as well as compressible non-Newtonian fluids (i.e., foams). The effects of major drilling parameters, such as flow rate, rate of penetration, fluid density, viscosity, gas ratio, cuttings size, cuttings density, wellbore inclination and eccentricity of the drillsting on cuttings transport efficiency are analyzed. The major findings from this study are,...
Stability Charts for the Collapse of Residual Soil in Karst
DRUMM, Eric C.; Akturk, Oezguer; Akgün, Haluk; Tutluoğlu, Levend (American Society of Civil Engineers (ASCE), 2009-07-01)
Collapse of the residual soil over bedrock cavities often occurs during construction in karst terrain, particularly when the thickness of the residuum is reduced during excavation. Even if an estimate of the strength of the residual soil is known, uncertainty with respect to the size/geometry of the subterranean voids makes a detailed analysis difficult, and straightforward methods to check the stability are needed. In this study, numerical analyses were performed to develop a stability chart expressed in t...
Citation Formats
K. Ö. Çetin, “CPT-Based Probabilistic Soil Characterization and Classification,” JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, pp. 84–107, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37284.