In Situ Determination of Density Profiles in Complex Strata Using the Nuclear Density Cone Penetrometer

Rui Jia, Huayang Lei, Wenjun Zhang and Haizuo Zhou

Mathematical Problems in Engineering, 2019, vol. 2019, 1-14

Abstract:

The nuclear density cone penetrometer (ND-CP) is an in situ testing device that can provide continuous data on soil density, but it measures the composite density ( ) of the soil within a spheroid centered at the midpoint between the gamma ray source and the detector. A theoretical model for predicting of the ND-CP is proposed, and equations for calculating are derived when the ND-CP penetrates into strata with different functions of density distributions. The calculated profiles provide a good fit to the laboratory-measured profiles by the ND-CP, indicating that the proposed theoretical model can be used to calculate the within the spheroid. The comparisons of the density ( Ï ) and values show that the profiles are considerably different from the actual Ï profiles at the boundaries of each stratum where density changes suddenly. Therefore, a method for deducing the actual Ï profiles from the measured profiles in complex strata is proposed, and this method is used to determine the actual Ï profiles from the ND-CP measured profiles in the field. The research results would be beneficial for the in situ determination of the density profile in complex strata using the ND-CP.

Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:5804271

DOI: 10.1155/2019/5804271

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