Correlation of DCPI with deformation under proof roller loading to assess soft subgrade stabilization criterion : addendum to NCDOT final report 2011-05, entitled : "Field verification of undercut criteria and alternatives for subgrade stabilization in th
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2016-11-21
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Alternative Title:Field verification of undercut criteria and alternatives for subgrade stabilization in the Piedmont Area.
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Abstract:Work presented herein is an addendum to the final report for NCDOT Project 2011-05 entitled
“Field Verification of Undercut Criteria and Alternatives for Subgrade Stabilization in the
Piedmont Area.” The objective of the addendum work is to provide NCDOT colleagues with
insight regarding the use of the Dynamic Cone Penetrometer Index (DCPI) as an indication for
the need to undercut and replace soft soils. Numerical analyses were conducted using the
computer program PLAXIS 3-D with the soil domain subjected to two cycles of proof rolling
load. The analyses were based on assuming various DCPI values in each of three 1ft - thick (12”)
layers and the corresponding soil strength and modulus properties. Two passes of proof roll
loading were applied, and the pass/fail criterion was based on the resulting subgrade deformation
exceeding one-inch. The analyses utilized three subsurface layers with the objective of exploring
the significance of the soft-layer location within the domain impacted by the stress bulb, and the
resulting decision as to whether or not undercutting will be needed.
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