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<p>Gently inclined fissured expansive soil slopes exhibit complex deformation and stability characteristics due to the presence of weak structural planes, posing significant risks to infrastructure. However, the reinforcement mechanisms of micropiles under such specific geological conditions remain inadequately understood. This study employs a self-developed large-scale experimental system to investigate the mechanical response of micropile-reinforced slopes, focusing on the effects of structural layout, geometric parameters, and fissure inclination. The results show that compared with unreinforced slopes, the total sliding resistance increased by 30% for independent double-row systems (where front and rear capping beams are unconnected), 82% for rectangular composite systems (integrally connected by orthogonal beams), and 105% for triangular composite systems (staggered rows integrated by triangular truss-like beams). Key design parameters were quantitatively determined, identifying an optimal pile spacing of 6<i>D</i>–8<i>D</i>, a row spacing of 10<i>D</i>, and critical anchorage ratios of ≥ 0.58 for distal layouts and ≥ 0.42 for proximal layouts. While steeper sliding surfaces reduced the initial peak resistance in unreinforced slopes, the micropile systems effectively mitigated post-peak strength degradation by mobilizing deeper passive resistance within the stable stratum. Among all configurations, the triangular composite beam systems exhibited the highest stabilization efficiency. This superior performance is driven by the rigid structural connectivity, which effectively transferred mechanically induced negative shear forces from the front pile row to the rear pile row. This statically indeterminate frame action enables optimal moment redistribution and shear homogenization, thereby suppressing local structural overstressing. Ultimately, these experimental findings establish a mechanism-based quantitative design framework, demonstrating that precise parameter selection and structural layout are critical for the resilient stabilization of micropile-reinforced, fissured expansive soil slopes.</p>

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Micropile reinforcement in fissured expansive slopes: experimental insights and design framework

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Rui Rui,
  • Shuo Yang,
  • Rong-ji Xia,
  • Kang-yu Wang,
  • Daniel Dias

摘要

Gently inclined fissured expansive soil slopes exhibit complex deformation and stability characteristics due to the presence of weak structural planes, posing significant risks to infrastructure. However, the reinforcement mechanisms of micropiles under such specific geological conditions remain inadequately understood. This study employs a self-developed large-scale experimental system to investigate the mechanical response of micropile-reinforced slopes, focusing on the effects of structural layout, geometric parameters, and fissure inclination. The results show that compared with unreinforced slopes, the total sliding resistance increased by 30% for independent double-row systems (where front and rear capping beams are unconnected), 82% for rectangular composite systems (integrally connected by orthogonal beams), and 105% for triangular composite systems (staggered rows integrated by triangular truss-like beams). Key design parameters were quantitatively determined, identifying an optimal pile spacing of 6D–8D, a row spacing of 10D, and critical anchorage ratios of ≥ 0.58 for distal layouts and ≥ 0.42 for proximal layouts. While steeper sliding surfaces reduced the initial peak resistance in unreinforced slopes, the micropile systems effectively mitigated post-peak strength degradation by mobilizing deeper passive resistance within the stable stratum. Among all configurations, the triangular composite beam systems exhibited the highest stabilization efficiency. This superior performance is driven by the rigid structural connectivity, which effectively transferred mechanically induced negative shear forces from the front pile row to the rear pile row. This statically indeterminate frame action enables optimal moment redistribution and shear homogenization, thereby suppressing local structural overstressing. Ultimately, these experimental findings establish a mechanism-based quantitative design framework, demonstrating that precise parameter selection and structural layout are critical for the resilient stabilization of micropile-reinforced, fissured expansive soil slopes.