Investigation of the Applicability of Intrusion Technology to Estimate the Resilient Modulus of Subgrade Soil [Final Report]
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2000-04-01
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Abstract:An innovative and simple approach is presented for estimation of the resilient modulus of subgrade soils utilizing the cone penetration test. Field and laboratory testing programs were carried out at seven sites that comprise three common soil types in Louisiana. Site characterization was conducted using cone penetration tests, in which continuous measurements of the cone tip resistance and sleeve friction are recorded. Undisturbed and disturbed soil samples were also obtained from different depths at the investigated sites. Laboratory tests were conducted on soil samples to determine the resilient modulus, strength parameters, physical properties, and compaction characteristics. Results of both field and laboratory testing programs were analyzed and critically evaluated. Statistical analyses were conducted on the cone soundings and showed that the results are repeatable at each test site within tolerable deviation. Statistical models for predicting the resilient modulus were proposed based on the field and laboratory test results of two soil types and two cases of stresses: in situ conditions and traffic loading. These models correlate the resilient modulus to the cone penetration test parameters, basic soil properties, and in situ stress conditions of the soil. The models for the cohesive soil were validated by predicting the resilient modulus of the other soils that were not used in the development of these models. Predicted and measured values of the resilient modulus are in good agreement. This research provided a preliminary validation of predicting the resilient modulus of subgrade soils utilizing the cone penetration test.
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