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岩溶典型区崩塌落石被动防护网失效概率模拟

卢彦丞 李军 梁风 史文兵 王军义

卢彦丞, 李军, 梁风, 史文兵, 王军义. 岩溶典型区崩塌落石被动防护网失效概率模拟[J]. 地质科技通报, 2024, 43(3): 240-250. doi: 10.19509/j.cnki.dzkq.tb20230552
引用本文: 卢彦丞, 李军, 梁风, 史文兵, 王军义. 岩溶典型区崩塌落石被动防护网失效概率模拟[J]. 地质科技通报, 2024, 43(3): 240-250. doi: 10.19509/j.cnki.dzkq.tb20230552
LU Yancheng, LI Jun, LIANG Feng, SHI Wenbing, WANG Junyi. Failure probability simulation of passive protection net for collapses and rockfalls in typical karst area[J]. Bulletin of Geological Science and Technology, 2024, 43(3): 240-250. doi: 10.19509/j.cnki.dzkq.tb20230552
Citation: LU Yancheng, LI Jun, LIANG Feng, SHI Wenbing, WANG Junyi. Failure probability simulation of passive protection net for collapses and rockfalls in typical karst area[J]. Bulletin of Geological Science and Technology, 2024, 43(3): 240-250. doi: 10.19509/j.cnki.dzkq.tb20230552

岩溶典型区崩塌落石被动防护网失效概率模拟

doi: 10.19509/j.cnki.dzkq.tb20230552
基金项目: 

贵州省科技计划项目 黔科合基础-ZK[2022]一般075

贵州省科技计划项目 黔科合基础-ZK[2021]一般228

贵阳市科技计划项目 筑科合同[2023]-13-10号

详细信息
    作者简介:

    卢彦丞, E-mail: 2362626847@qq.com

    通讯作者:

    李军, E-mail: 76133353@qq.com

  • 中图分类号: P642.21

Failure probability simulation of passive protection net for collapses and rockfalls in typical karst area

More Information
  • 摘要:

    贵州省位于我国西南地区, 多山地丘陵, 是典型的喀斯特地形地貌区, 崩塌、滑坡等地质灾害频发。思南县小屯岩崩塌带上现存危岩体方量大, 裂隙、凹岩腔、溶蚀孔洞等发育。为研究岩溶典型区崩塌落石被动防护网失效概率, 通过高精度实景建模技术, 构建崩塌带三维模型, 进行崩塌落石运动过程模拟, 根据现场调查、无人机航拍和数值模拟结果, 选择合适的位置布设落石被动防护网。基于落石粒径大小识别, 选取不同粒径大小的落石, 进行落石被动防护网拦截效果模拟, 计算落石被动防护网失效概率。结果表明: 13种粒径落石突破概率各不相同, (0.25, 2.25] m粒径落石拦截效果良好, 但落石被动防护网拦截率不能达到百分之百; 落石粒径大于2.25 m, 被动防护网出现失效现象, 故将2.25 m粒径的落石为小屯岩崩塌带下被动防护网的设计上限。根据计算, 所有粒径落石经被动防护网拦截后的失效概率低于5%, 属可接受范畴。研究成果为小屯岩崩塌带的落石防护措施提供了有力的参考依据, 对保护岩溶地区山区人民的生命安全和财产安全具有重要意义。

     

  • 图 1  小屯岩崩塌带全貌

    Figure 1.  Overview of the Xiaotunyan collapse zone

    图 2  小屯岩崩塌带工程地质平面图(a)和地质剖面示意图(b)

    Figure 2.  Engineering geological plan(a) and geological profile(b) of the Xiaotunyan collapse zone

    图 3  小屯岩崩塌带坡面划分

    Figure 3.  Slope division of the Xiaotunyan collapse zone

    图 4  崩塌落石堆积分布特征

    Figure 4.  Distribution characteristics of collapse and rockfall accumulation

    图 5  PCAS软件颗粒识别效果

    Figure 5.  Particle identification effect of PCAS software

    图 6  崩塌落石粒径统计概率

    Figure 6.  Statistical probability of rockfall particle size

    图 7  3种粒径落石的运动轨迹图

    a~c分别为0.75, 2.75,5.25 m粒径落石的运动轨迹俯瞰图;d~f分别为0.75, 2.75,5.25 m粒径落石的运动轨迹侧视图

    Figure 7.  Motion track of rockfall with three particle sizes

    图 8  3种粒径落石的运动特征分布图

    a~c分别为0.75, 2.75,5.25 m粒径落石的弹跳高度;d~f分别为0.75, 2.75,5.25 m粒径落石的运动冲击能量

    Figure 8.  Motion characteristic distribution of rockfall with three particle sizes

    图 9  落石被动防护网布置位置

    Figure 9.  Location layout of passive protection net for rockfall

    图 10  小粒径落石的运动过程模拟及拦截效果

    Figure 10.  Movement process and interception effect of small particle size rockfalls

    图 11  中等粒径落石的运动过程及拦截效果

    Figure 11.  Movement process and interception effect of medium particle size rockfalls

    图 12  大粒径落石的运动过程及拦截效果

    Figure 12.  Movement process and interception effect of large particle size rockfalls

    图 13  落石粒径分布概率及突破概率

    Figure 13.  Breakout probability and distribution probability of rockfall with different particle sizes

    表  1  坡面计算参数赋值

    Table  1.   Slope calculation parameter assignment

    坡面变型 法向恢复系数 切向恢复系数 滑动或滚动摩擦系数
    裸岩-灰岩 0.65 0.88 0.35
    碎石堆积区 0.45 0.75 0.70
    覆土区 0.35 0.60 0.55
    道路住房区 0.50 0.80 0.55
    下载: 导出CSV
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  • 收稿日期:  2023-10-03
  • 录用日期:  2023-12-12
  • 修回日期:  2023-12-07

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