Volume 40 Issue 5
Oct.  2026
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HE Lin, ZHOU Bingwei, HUANG Boqing. Mechanism and quantitative characterization of calcareous concretion regulating crack development in expansive soil[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 738-746. doi: 10.20265/j.cnki.issn.1007-2993.2025-0348
Citation: HE Lin, ZHOU Bingwei, HUANG Boqing. Mechanism and quantitative characterization of calcareous concretion regulating crack development in expansive soil[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 738-746. doi: 10.20265/j.cnki.issn.1007-2993.2025-0348
shu

Mechanism and quantitative characterization of calcareous concretion regulating crack development in expansive soil

doi: 10.20265/j.cnki.issn.1007-2993.2025-0348
  • 1.

    Shaanxi Geology and Mining Hanzhong Geological Brigade Co., Ltd., Hanzhong, 723000, Shaanxi, China

  • 2.

    School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710000, Shaanxi, China

  • Received Date: 2025-08-07
  • Accepted Date: 2026-01-08
  • Rev Recd Date: 2025-10-21
    • Available Online: 2026-10-08
  • Publish Date: 2026-10-08
    Abstract
  • In this study, calcareous concretion-like heterogeneities with different area coverage were incorporated into remolded expansive soil, and the Soil Crack Identification System was employed to dynamically monitor and quantitatively analyze the entire process of crack development during dehydration. The test results show that the heterogeneities have a significant influence on the geometric characteristics and development of the expansion soil cracks, systematically regulating quantitative indicators such as crack rate. With the increase of the heterogeneities coverage, the crack initiation and inflection point moisture content occur earlier, and the crack development tends to form a more direct and fewer expansion paths along the boundaries of the heterogeneities, and inhibits the evolution of cracks to wider morphology. Among them, the coverage of 15.7% is the threshold of regulation effect. Under this coverage, the crack rate, total crack length and fractal dimension all reach the maximum value. The influence of heterogeneities on crack development exhibits staged characteristics, with the stress concentration effect, partition constraint effect and interface effect acting together to determine the process of crack emergence, expansion and stabilisation. The research findings can provide a theoretical basis for an in-depth understanding of the mechanism of crack development in heterogeneous soils and related engineering practices.

     

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