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<p>The external soil spraying technique is widely used for the ecological restoration of rocky slopes affected by modern engineering projects. However, shallow soils on bedrock slopes are vulnerable to cracking and moisture loss during the early spraying stages, especially under wetting–drying cycles, and the roughness amplitude of the soil–rock interface significantly influences these processes. These degradations compromise slope stability and hinder ecological recovery. To investigate the combined effects of interface roughness amplitude and polymer treatment on soil evaporation and cracking, laboratory evaporation and wetting–drying cycle tests were conducted. The results showed that greater interface roughness amplitude promoted earlier crack initiation, more severe crack propagation, and faster evaporation. In contrast, the incorporation of locust bean gum (LBG) significantly enhanced soil cohesion and water retention. At 0.2% LBG, the crack ratio was reduced by over 90%, and at 0.3%, cracking was substantially suppressed. Polymer addition also reduced cumulative evaporation and simplified the crack network, lowering both the fractal dimension and crack width. These findings highlight the dual role of interface roughness amplitude and polymer amendments in controlling soil cracking and evaporation, providing new solutions for improving the stability of soil–rock interfaces in ecological restoration projects.</p>

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Multi-scale study on the cracking performance of overlying soils in relation to the interaction between polymer intervention and rock interface roughness amplitude

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Yipin Lu,
  • Jin Liu,
  • Gang Zhang,
  • Yue Yang,
  • Meng Wu,
  • Zezhuo Song,
  • Wenyue Che,
  • Chenyang Zhang

摘要

The external soil spraying technique is widely used for the ecological restoration of rocky slopes affected by modern engineering projects. However, shallow soils on bedrock slopes are vulnerable to cracking and moisture loss during the early spraying stages, especially under wetting–drying cycles, and the roughness amplitude of the soil–rock interface significantly influences these processes. These degradations compromise slope stability and hinder ecological recovery. To investigate the combined effects of interface roughness amplitude and polymer treatment on soil evaporation and cracking, laboratory evaporation and wetting–drying cycle tests were conducted. The results showed that greater interface roughness amplitude promoted earlier crack initiation, more severe crack propagation, and faster evaporation. In contrast, the incorporation of locust bean gum (LBG) significantly enhanced soil cohesion and water retention. At 0.2% LBG, the crack ratio was reduced by over 90%, and at 0.3%, cracking was substantially suppressed. Polymer addition also reduced cumulative evaporation and simplified the crack network, lowering both the fractal dimension and crack width. These findings highlight the dual role of interface roughness amplitude and polymer amendments in controlling soil cracking and evaporation, providing new solutions for improving the stability of soil–rock interfaces in ecological restoration projects.