岩土力学 ›› 2021, Vol. 42 ›› Issue (12): 3356-3365.doi: 10.16285/j.rsm.2021.0848

• 岩土工程研究 • 上一篇    下一篇

滚石冲击改进型开口帘式网耗能机制研究

王东坡1，何启维1，刘彦辉2，温继伟1，李伟1   

  1. 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
  • 收稿日期:2021-06-07 修回日期:2021-07-07 出版日期:2021-12-13 发布日期:2021-12-14
  • 作者简介:王东坡，男，1984年生，博士，博士后，教授，博士生导师，主要从事地质灾害冲击动力学方面的研究
  • 基金资助:
    国家自然科学基金（No.41877266）；四川省杰出青年科技人才项目（No.2020JDJQ0044）。

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

WANG Dong-po1, HE Qi-wei1, LIU Yan-hui2, WEN Ji-wei1, LI wei1   

  1. 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. China Railway First Survey and Design Institute Group Co., Ltd., Xi’an, Shaanxi 710043, China
  • Received:2021-06-07 Revised:2021-07-07 Online:2021-12-13 Published:2021-12-14
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(41877266) and the Science Foundation for Distinguished Young Scholars of Sichuan Province(2020JDJQ0044).

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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。

关键词: 滚石冲击, 改进型开口帘式网, 耗能机制, 原位试验, 数值模拟

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.

Key words: rockfall impacts, improved rockfall attenuator barrier, energy dissipation mechanism, in-situ test, numerical simulation

中图分类号: P 64
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