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

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  • Rui Jia
  • Huayang Lei
  • Wenjun Zhang
  • Haizuo Zhou

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.

Suggested Citation

  • Rui Jia & Huayang Lei & Wenjun Zhang & Haizuo Zhou, 2019. "In Situ Determination of Density Profiles in Complex Strata Using the Nuclear Density Cone Penetrometer," Mathematical Problems in Engineering, Hindawi, vol. 2019, pages 1-14, June.
    • Handle: RePEc:hin:jnlmpe:5804271
    DOI: 10.1155/2019/5804271
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