Geomechanics and Engineering

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Influencing of drying-wetting cycles on mechanical behaviors of silty clay with different initial moisture content

  • Shi-lin Luo (School of Civil Engineering, Changsha University) ;
  • Da Huang (College of Civil Engineering and Geomatics, Chang'an University) ;
  • Jian-bing Peng (College of Civil Engineering and Geomatics, Chang'an University) ;
  • Fei Liu (School of Civil and Transportation Engineering, Henan University of Urban Construction) ;
  • Xiao-ran Gao (College of Civil Engineering and Geomatics, Chang'an University) ;
  • Roberto Tomas (Dpto. de Ingenieria Civil. Escuela Politecnica Superior de Alicante. Universidad de Alicante)
  • Received : 2024.02.18
  • Accepted : 2024.07.29
  • Published : 2024.08.10
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Abstract

To get a better understanding of the effect of drying-wetting cycles (DWC) on the mechanical behaviors of silty clay hiving different initial moisture content (IMC), the direct shear tests were performed on sliding band soil taken from a reservoirinduced landslide at the Three Gorges Reservoir area. The results indicated that, as the increasing number of DWC, the shear stress-displacement curves type changed from strain-hardening to strain-softening, and both the soil peak strengths and strength parameters reduced first and then nearly remain unchanged after a certain number of DWC. The effects of DWC on the cohesion were predominated that on the internal friction angle. The IMC of 17% is regarding as the critical moisture content, and the evolution laws of both peak shear strength and strength parameters presented a reversed 'U' type with the rising of the IMC. Based on it, a strength deterioration evolution model incorporating the influence of IMC and DWC was developed to describe the total degradation degree and degradation rate of strength parameters, and the degradation of strength parameters caused by DWC could be counterbalanced to some extent as the soil IMC close to critical moisture content. The microscopic mechanism for the soil strength caused by the IMC and DWC were discussed separately. The research results are of great significance for further understanding the water-weakening mechanicals of the silty clay subjected to the water absorption/desorption.

Keywords

Acknowledgement

This work is supported by the National Natural Science Foundation of China (42277187), United Key Program of National Natural Sciences Foundation of China (U23A202579), Changsha Municipal Natural Science Foundation (kq2202065) and Open Research Fund Program of Hunan Provincial Key Laboratory for Big Data Smart Application of Natural Disaster Risks Survey of Highway Engineering. The author Roberto Tomas is supported by the Conselleria de Innovacion, Universidades, Ciencia y Sociedad Digital within the framework of the project CIAICO/2021/335.

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