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Related Concept Videos

Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

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Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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Efficient optimization parameter calibration method-based DEM simulation for compacted loess slope under dry-wet

Liang Li1,2, Changming Hu3,4, Yili Yuan5

  • 1College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.

Scientific Reports
|July 29, 2024
PubMed
Summary

Dry-wet cycles degrade compacted loess slopes, reducing safety. This study uses the discrete element method (DEM) and a novel optimization technique to analyze slope stability under these cycles, revealing degradation trends.

Keywords:
Compacted loessDiscrete element methodOptimization algorithmParameter calibrationSlope stability

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Area of Science:

  • Geotechnical Engineering
  • Computational Mechanics

Background:

  • Compacted loess slopes are susceptible to deterioration from dry-wet cycles, impacting fill slope safety.
  • The discrete element method (DEM) is suitable for analyzing discontinuous and anisotropic geotechnical materials like loess.

Purpose of the Study:

  • To analyze the stability of compacted loess slopes under dry-wet cycles using DEM.
  • To develop an efficient parameter optimization method for DEM models in geotechnical analysis.
  • To introduce a new indicator, the bonding ratio (BR), to assess loess degradation.

Main Methods:

  • Implemented a chaotic particle swarm optimization with sigmoid-based acceleration coefficients algorithm (CPSOS) for DEM parameter calibration.
  • Introduced and utilized the bonding ratio (BR) to characterize pore and crack development during dry-wet cycles.
  • Established a DEM-based slope stability analysis model for compacted loess under cyclic wetting and drying.

Main Results:

  • The CPSOS method accurately calibrated DEM parameters, reflecting actual stress-strain and strength trends under dry-wet cycles.
  • The bonding ratio (BR) effectively quantified the degradation of loess bonding due to dry-wet cycles.
  • DEM analysis confirmed that dry-wet cycles negatively impact loess slope safety factors, with a trend towards stabilization over cycles.

Conclusions:

  • The proposed DEM approach with CPSOS calibration and BR indicator provides a reliable method for analyzing compacted loess slope stability under dry-wet cycles.
  • DEM accurately simulates the degradation effects of dry-wet cycles on loess slopes, validating its use in geotechnical engineering.
  • The findings contribute to understanding and mitigating risks associated with loess slopes in environments with fluctuating moisture content.