Correlation of Shallow, Low Blow Count Texas Cone Penetrometer Values and Shear Strength for Texas Soils, Project Summary.

摘要

The Texas Department of Transportation (TxDOT) routinely performs Texas Cone Penetrometer (TCP) tests as part of soil site investigations. Often data from these tests is the only data available for estimating soil undrained shear strengths for preliminary design. Correlations have existed between blow counts from TCP tests and undrained shear strength; these correlations have frequently been used to estimate undrained shear strengths. However, the previous correlations have been derived primarily for deep foundations and relatively strong soils. The correlations are believed to be conservative and to substantially underestimate the undrained shear strength of soft (< 1000 psf undrained shear strength) soils. This often leads to either costly designs or unnecessary additional testing to establish more reliable strength values. This project was undertaken to develop an improved and more reliable correlation between the undrained shear strength of soils and the TCP blow count for soils with blow counts generally less than 15.