Abstract
The California bearing ratio (CBR) test is still widely used in the design and analysis of pavements. The CBR test is relatively expensive and time consuming. A method is proposed for correlating CBR values with the undrained shear strength of clay soils, or the effective internal friction angle of noncohesive soils. Unconsolidated undrained triaxial tests on clays and quick drained-triaxial tests on sands can determine these parameters. These tests are much more economical and rapid than the CBR test. The correlation is based on foundation-bearing capacity theory. The configuration of the CBR test can be closely modeled in bearing capacity theory as a circular foundation with a surcharge. Actual test results are presented to support the correlations. The proposed method allows economical development of estimated CBR values from quick shear tests. The correlation between shear strength results and CBR has been established on the basis of a limited number of soil samples. Additional test results are needed to verify the correlation. In the interim, the proposed method should be used with good judgment and engineering experience to provide a quick method of determining sub-grade soil properties for pavement thickness design.
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Schedule a callMore From: Transportation Research Record: Journal of the Transportation Research Board
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