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<p>As underground engineering extends to greater depths, the nonlinear deformation characteristics of rock masses pose significant challenges to support systems, resulting in critical engineering hazards including large deformation of soft rock, rockburst, and coal bump. In response, a novel steel pipe shrinkable energy-absorbing bolt/cable was proposed, characterized by its stable load-bearing capacity, structural simplicity, and convenience installation. A theoretical formula for constant resistance was derived, demonstrating that constant resistance depends solely on the friction coefficient and geometric parameters, while remaining independent of external loads or rock mass properties. The superior and stable energy absorption and load capacity of the bolts/cables were confirmed through static tests and drop-weight impact tests. The energy absorption of constant resistors with different load capacities was measured as 53 kJ and 103 kJ, respectively, demonstrating excellent impact resistance. The stress–strain behavior under dynamic loading was further elucidated through complementary numerical simulations. This research offers robust technical support for the prevention and control of deep engineering disasters.</p>

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Steel Pipe Shrinkable Energy-Absorbing Bolt/Cable for Deep Underground Engineering: Design, Testing, and Performance Evaluation

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Mingzhu Zhao,
  • Xuezhen Wu,
  • Weizhong Chen,
  • Xianjun Tan,
  • Yujing Jiang,
  • Gang Wang,
  • Fengqiang Gong

摘要

As underground engineering extends to greater depths, the nonlinear deformation characteristics of rock masses pose significant challenges to support systems, resulting in critical engineering hazards including large deformation of soft rock, rockburst, and coal bump. In response, a novel steel pipe shrinkable energy-absorbing bolt/cable was proposed, characterized by its stable load-bearing capacity, structural simplicity, and convenience installation. A theoretical formula for constant resistance was derived, demonstrating that constant resistance depends solely on the friction coefficient and geometric parameters, while remaining independent of external loads or rock mass properties. The superior and stable energy absorption and load capacity of the bolts/cables were confirmed through static tests and drop-weight impact tests. The energy absorption of constant resistors with different load capacities was measured as 53 kJ and 103 kJ, respectively, demonstrating excellent impact resistance. The stress–strain behavior under dynamic loading was further elucidated through complementary numerical simulations. This research offers robust technical support for the prevention and control of deep engineering disasters.