Research on the energy dissipation mechanism of rockfall impacts on the improved rockfall attenuator barrier

WANG Dong-po; HE Qi-wei; LIU Yan-hui; WEN Ji-wei; LI wei

doi:10.16285/j.rsm.2021.0848

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Research on the energy dissipation mechanism of rockfall impacts on the improved rockfall attenuator barrier

更新时间：2026-06-25

- Research on the energy dissipation mechanism of rockfall impacts on the improved rockfall attenuator barrier
- Vol. 42, Issue 12, Pages: 3356-3365(2021)
- 作者机构：
  
  1. 成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川,成都,610059
  2. 中铁第一勘察设计院集团有限公司,陕西,西安,710043
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.0848
  CLC： P694
- Online First：14 December 2021，
  
  Published：2021
- 稿件说明：
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WANG Dong-po, HE Qi-wei, LIU Yan-hui, et al. Research on the energy dissipation mechanism of rockfall impacts on the improved rockfall attenuator barrier[J]. 2021, 42(12): 3356-3365.
DOI：

WANG Dong-po, HE Qi-wei, LIU Yan-hui, et al. Research on the energy dissipation mechanism of rockfall impacts on the improved rockfall attenuator barrier[J]. 2021, 42(12): 3356-3365. DOI： 10.16285/j.rsm.2021.0848.

摘要

帘式网是以引导、消能为主要作用机制的滚石柔性防护结构。传统帘式网因受制于维护难、成本高等问题，阻碍了其在滚石防治领域的推广应用。为此，基于下开口设计理念并优化传统帘式网拖尾长度提出了一种改进型开口帘式网。通过开展滚石冲击现场原位试验，研究不同拖尾长度对改进型开口帘式网耗能机制的影响。试验结果表明：改进型开口帘式网解决了滚石停滞网内清理不便的问题，其自身的裹挟、摩擦作用有效发挥了结构的柔性耗能特性，从而降低了滚石冲击能量；当拖尾长度由3 m增加到7 m时，滚石动能衰减率提高约20%，但其增幅呈下降趋势。为进一步提升改进型开口帘式网的耗能效果，通过数值模拟研究了滚石不同冲击位置和冲击角度对帘式网耗能效果的影响。模拟结果表明：滚石冲击帘式网中部时动能衰减率高于边侧位置，最高可提升20%；当滚石冲击方向与帘式网的夹角近似为45o时，滚石动能衰减率最高可达74.1%。因此，在实际工程中可通过合理设置帘式网拖尾长度、布设位置与倾斜角度使其耗能效果达到最大化。

Abstract

With the main mechanisms of energy guiding and energy dissipation

the rockfall attenuator barrier has become a flexible structure to control rockfall disaster. The problems of difficult maintenance and high cost hinder the wide application of classic rockfall attenuator barriers in the field of rockfall protection. Therefore

combining with the lower open-ended design concept

we optimize the extension length and propose an improved rockfall attenuator barrier. In this study

the energy dissipation mechanism of the improved rockfall attenuator barrier under different extension lengths was investigated

by carrying out in-situ tests of the rockfall impact. The results show that the improved rockfall attenuator barrier is effective in cleaning up the rockfall stopped in the mesh. The constraint and friction effect of the improved rockfall attenuator barrier can effectively exert its flexible energy dissipation characteristics

thus reducing the impact energy of the rockfall. When the extension length of the improved rockfall attenuator barrier increases from 3 m to 7 m

the energy attenuation rate of the rockfall increases by approximately 20%. However

the increment of the energy attenuation rate gradually decreases with the increase of the extension length. To further improve the energy dissipation effect of the improved rockfall attenuator barrier

the influence of impact positions and angles of the rockfall on the energy dissipation effect of the improved rockfall attenuator barrier was studied by numerical simulation. The simulation results show that the energy attenuation rate was the highest when the rockfall impacted the middle position of the improved rockfall attenuator barrier

and the energy attenuation rate was increased by 20% compared with the position at the side of the impact edge. The energy attenuation rate of the rockfall reached the highest at 74.1%

when the angle between the impact direction of the rockfall and the improved rockfall attenuator barrier was approximately 45o. Therefore

the energy dissipation effect of the rockfall attenuator barrier can be maximized by reasonably setting extension length

installation location and inclination angle in engineering practice.

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