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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 7    July 2020

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Numerical simulation of intelligent compaction for subgrade construction
MA Yuan(马源)1, LUAN Ying-cheng(栾英成)1, ZHANG Wei-guang(张伟光)1, ZHANG Yu-qing(张裕卿)2, 3

1. School of Transportation, Southeast University, Nanjing 210096, China;
2. National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China;
3. Aston Institute of Materials Research, Engineering Systems & Management Group, Aston University,Birmingham, B4 7ET, UK

Abstract:During the compaction of a road subgrade, the mechanical parameters of the soil mass change in real time, but current research assumes that these parameters remain unchanged. In order to address this discrepancy, this paper establishes a relationship between the degree of compaction K and strain ε. The relationship between the compaction degree K and the shear strength of soil (cohesion c and frictional angle φ) was clearly established through indoor experiments. The subroutine UMAT in ABAQUS finite element numerical software was developed to realize an accurate calculation of the subgrade soil compaction quality. This value was compared and analyzed against the assumed compaction value of the model, thereby verifying the accuracy of the intelligent compaction calculation results for subgrade soil. On this basis, orthogonal tests of the influential factors (frequency, amplitude, and quality) for the degree of compaction and sensitivity analysis were carried out. Finally, the ‘acceleration intelligent compaction value’, which is based on the acceleration signal, is proposed for a compaction meter value that indicates poor accuracy. The research results can provide guidance and basis for further research into the accurate control of compaction quality for roadbeds and pavements.

 

Key words: intelligent compaction; numerical simulation; dynamic change; control indicators; orthogonal experiment

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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