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Relating Undrained Shear Strength of Clay with Blow-Count of Texas Cone Penetrometer
Nutan Palla Tolunay Wong Engineers, Inc. Liang Chao Technology and Science Institute of Northern Taiwan, Taipei, Taiwan – 11202
Mien Jao Department of Civil Engineering, Lamar University
Beaumont, Texas, USA-77706 M. C. Wang Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania, USA-16802
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ABSTRACT |
Accurate undrained shear strength values of soils are vital to the successful design of geotechnical structures. Currently, the Texas Cone Penetrometer (TCP) test is the primary means for in-situ determination of undrained shear strength of cohesive soils by the Texas Department of Transportation (TxDOT). Graphs and equations relating undrained shear strength and blow-count of TCP have been developed by TxDOT for practical applications. However, it has been found that the available relations may not be able to provide accurate shear strength values for some soil and field conditions. This study attempts to improve the available relations between undrained shear strength and TCP blow-count for cohesive soils.
In this study, a database was created based on the field and laboratory test data collected by TxDOT from various places in southeast Texas sites in the past 11 years. This database together with the bearing capacity principle was used to develop relations between undrained shear strength and TCP blow-count. The effectiveness of the new relations was demonstrated by comparing with the existing TxDOT Design equations.
Keywords: Texas Cone Penetrometer, Penetration Test, Blow Count, Correlation, Undrained Shear Strength, Undrained Cohesion, CH (Clay with High Plasticity), CL (Clay with Low Plasticity)
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