Evaluation of Undrained Shear Strength from Cone Penetration Test

The in-situ cone and piezocone penetration tests (CPT, PCPT) have been widely used for the past three decades by the geotechnical engineering community for subsurface soil characterization, soil classification, and for evaluation of many engineering soil properties, such as undrained shear strength (su), constrained modulus (M), coefficient of consolidation (cv), stress history (OCR), etc. The purpose of this paper is to estimate the undrained shear strength (su) of clayey soils using CPT/PCPT data, in addition to some soil boring log data. For this purpose, 70 CPT data collected from different sites at 14 different parishes in Louisiana were analyzed. In each site, both laboratory and CPT tests were performed at the some specific location in order to evaluate the cone and soil parameters (i.e., corrected cone tip resistance, qt; sleeve friction, fs; total overburden pressure, svo; plasticity index, Ip; liquid limit, LL; moisture content, MC). The su of individual soil layers were determined from laboratory unconsolidated undrained (UU) triaxial tests. Both linear and non-linear statistical regression models were developed and verified using the measured soil parameters to estimate su for individual clayey soil layers. Several good su models were developed. However, the su model that contains qt, fs, sv0 parameters was found to be the best model as it satisfies all statistical criteria, in which the estimated values of su from CPT data are very close to the measured values from laboratory UU tests. ).

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFP30 Standing Committee on Soil and Rock Properties.
• Corporate Authors:

  Transportation Research Board

  ,    
• Authors:
  • Hossain, Md. Imran
  • Abu-Farsakh, Murad Y
• Conference:
  • Transportation Research Board 98th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2019-1-13 to 2019-1-17
• Date: 2019

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 7p

Subject/Index Terms

• TRT Terms: Clay soils; Soil penetration test; Undrained shear strength
• Uncontrolled Terms: Cone penetration tests; Sleeve friction
• Geographic Terms: Louisiana
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 01698218
• Record Type: Publication
• Report/Paper Numbers: 19-00897
• Files: TRIS, TRB, ATRI
• Created Date: Mar 1 2019 3:51PM