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<p>Yielding support, which dissipates deformation energy from surrounding rock while preserving the integrity of the support structure, is the most effective method for controlling large deformations under quasi-static loading conditions in soft rock tunnels. A key factor in ensuring the stability of the entire support system is the ability of the yielding structure to provide stable and sustained constant-resistance yielding. This study investigates the yielding mechanical properties of steel honeycomb structures and examines the influence of their parameters on performance, using both laboratory experiments and numerical simulations. Additionally, the yielding behavior of different honeycomb configurations is compared to identify the optimal structure for steel honeycomb elements. First, laboratory experiments are conducted to assess the effects of honeycomb wall thickness, unit height, and layer count on yielding performance. Next, numerical simulations are used to analyze the yielding behavior of various honeycomb configurations, facilitating the selection of the most suitable structure for yielding support. The results show that steel honeycombs under compression exhibit elastic, constant-resistance, strengthening, and densification stages. The constant-resistance and strengthening stages govern energy absorption efficiency, determined by three metrics: constant-resistance load, effective yielding displacement, and energy absorption capacity. Thicker walls increase load capacity and energy absorption but reduce deformation. Larger cell heights lower load resistance but enhance deformation and energy absorption. More layers at the same cell height improve deformation without sacrificing strain efficiency. High-load applications require thicker walls and shorter cells. Circular, concave, and hexagonal honeycombs offer optimal stability, with low peak loads, near-unity peak-to-mean ratios, and smooth load–displacement transitions. Triangular and quadrilateral designs, despite high energy absorption, exhibit unstable yielding due to excessive peak loads and rapid unloading. The former group is recommended for engineering applications.</p>

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Experimental and Numerical Investigation on the In-Plane Yielding Mechanical Performance of Steel Honeycomb Elements

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Kai Yang,
  • Wenjie Yang,
  • Qixiang Yan,
  • Yuwen Li,
  • Shizhan Li,
  • Mengmeng Liu,
  • Chuan Zhang,
  • Huayun Li

摘要

Yielding support, which dissipates deformation energy from surrounding rock while preserving the integrity of the support structure, is the most effective method for controlling large deformations under quasi-static loading conditions in soft rock tunnels. A key factor in ensuring the stability of the entire support system is the ability of the yielding structure to provide stable and sustained constant-resistance yielding. This study investigates the yielding mechanical properties of steel honeycomb structures and examines the influence of their parameters on performance, using both laboratory experiments and numerical simulations. Additionally, the yielding behavior of different honeycomb configurations is compared to identify the optimal structure for steel honeycomb elements. First, laboratory experiments are conducted to assess the effects of honeycomb wall thickness, unit height, and layer count on yielding performance. Next, numerical simulations are used to analyze the yielding behavior of various honeycomb configurations, facilitating the selection of the most suitable structure for yielding support. The results show that steel honeycombs under compression exhibit elastic, constant-resistance, strengthening, and densification stages. The constant-resistance and strengthening stages govern energy absorption efficiency, determined by three metrics: constant-resistance load, effective yielding displacement, and energy absorption capacity. Thicker walls increase load capacity and energy absorption but reduce deformation. Larger cell heights lower load resistance but enhance deformation and energy absorption. More layers at the same cell height improve deformation without sacrificing strain efficiency. High-load applications require thicker walls and shorter cells. Circular, concave, and hexagonal honeycombs offer optimal stability, with low peak loads, near-unity peak-to-mean ratios, and smooth load–displacement transitions. Triangular and quadrilateral designs, despite high energy absorption, exhibit unstable yielding due to excessive peak loads and rapid unloading. The former group is recommended for engineering applications.