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Related Experiment Video

Updated: Jul 28, 2025

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
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Improved measurement method for roadbed bearing capacity based on PFWD dynamic modulus control.

Danfeng Li1, Zhuojie Zhang2, Guangming Zhang3

  • 1School of Architecture and Civil Engineering, Taizhou University, Taizhou, 318000, Zhejiang, China.

Scientific Reports
|May 31, 2023
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Summary

This study introduces an improved method for measuring roadbed bearing capacity using a portable falling weight deflectometer (PFWD). The new approach enhances accuracy and efficiency in dynamic roadbed evaluation.

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Area of Science:

  • Geotechnical Engineering
  • Civil Engineering

Background:

  • Standardizing dynamic roadbed bearing capacity determination is challenging.
  • Existing deflection control methods exhibit excessive deviations.
  • Accurate assessment of roadbed load-bearing capacity is crucial for infrastructure integrity.

Purpose of the Study:

  • To propose an improved measurement method for roadbed load-bearing capacity.
  • To enhance the precision and efficiency of dynamic roadbed evaluation.
  • To address limitations in current dynamic determination and deflection control.

Main Methods:

  • Utilized a portable falling weight deflectometer (PFWD) for dynamic modulus control.
  • Determined PFWD detection range through theoretical analysis.
  • Developed a finite element numerical model to analyze dynamic stress distribution and attenuation.
  • Investigated the variation of vertical dynamic stress with depth, revealing an initial increase followed by a decrease.

Main Results:

  • The spatial distribution and attenuation of dynamic stress in roadbed soil were determined.
  • Vertical dynamic stress was found to increase with depth initially, then decrease, contrary to common assumptions.
  • A prediction model was developed using dynamic bending as the detection index and static rebound modulus as the control index.

Conclusions:

  • The proposed improved method enhances precision accuracy and detection efficiency for roadbed load-bearing capacity.
  • The study verifies the effectiveness of the new method for accurate dynamic measurement and evaluation.
  • Findings are significant for improving the reliability of highway roadbed assessments.