Towards Implementing SCPTu Geotechnical Design Guidelines for the State of Illinois
Publication: Geo-Congress 2023
ABSTRACT
The cone penetration test (CPT) is widely used in geotechnical engineering for subsurface soil characterization due to its nearly continuous profiling, expediency, and repeatability, which are difficult to match with drilling, sampling, and laboratory testing, or other subsurface characterization techniques such as the standard penetration testing (SPT). In addition to obtaining the cone tip resistance, sleeve friction, and pore water pressure, the seismic piezocone penetration test (SCPTu) also provides measurements of shear wave velocities with depth. A series of SCPTu soundings have been completed at several strategic Illinois test locations to characterize the particular response of Illinois soils in terms of stress history, strength, compressibility, stiffness, organic content, and hydraulic properties. Additionally, since the current geotechnical engineering practice in Illinois has a heavy reliance upon the SPT, an evaluation of correlations between paired sets of SCPTu readings and SPT blow counts corrected for energy efficiencies was made at a selected location. The findings of this research will be incorporated into the Illinois Department of Transportation’s (IDOT) geotechnical manual through the development of guidelines for using CPT in the state of Illinois. This effort is geared towards expanding the use of CPT in IDOT practice allowing for higher quality subsurface data that can reduce design costs while increasing sustainability and reducing risk.
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Geo-Congress 2023
Pages: 104 - 113
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Published online: Mar 23, 2023
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