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基于声发射技术的岩溶塌陷监测预警试验研究

潘宗源 戴建玲 蒙彦 蒋小珍 马骁 白冰 吴远斌 张心

潘宗源,戴建玲,蒙 彦,等. 基于声发射技术的岩溶塌陷监测预警试验研究[J]. 中国岩溶,2024,43(0):1-13 doi: 10.11932/karst2024y020
引用本文: 潘宗源,戴建玲,蒙 彦,等. 基于声发射技术的岩溶塌陷监测预警试验研究[J]. 中国岩溶,2024,43(0):1-13 doi: 10.11932/karst2024y020
PAN Zongyuan, DAI Jianling, MENG Yan, JIANG Xiaozhen, MA Xiao, BAI Bing, WU Yuanbin, ZHANG Xin. Experimental study on monitoring and early warning of cover collapse sinkhole based on acoustic emission technology[J]. CARSOLOGICA SINICA. doi: 10.11932/karst2024y020
Citation: PAN Zongyuan, DAI Jianling, MENG Yan, JIANG Xiaozhen, MA Xiao, BAI Bing, WU Yuanbin, ZHANG Xin. Experimental study on monitoring and early warning of cover collapse sinkhole based on acoustic emission technology[J]. CARSOLOGICA SINICA. doi: 10.11932/karst2024y020

基于声发射技术的岩溶塌陷监测预警试验研究

doi: 10.11932/karst2024y020
基金项目: 中国地质科学院岩溶地质研究所基本科研业务费项目(2021003);广西自然科学基金资助项目(2023GXNSFAA026432);中国地质调查局地质调查项目(DD20230441)
详细信息
    作者简介:

    潘宗源(1987-),男,博士研究生,副研究员,主要研究方向为工程地质灾害机理与防治技术。E-mail:65709162@qq.com

  • 中图分类号: P642.25

Experimental study on monitoring and early warning of cover collapse sinkhole based on acoustic emission technology

  • 摘要: 岩溶塌陷是土体损伤孔洞发育并最终导致盖层失稳的动力地质过程,故查明土体损伤特征及演化过程是提出有效监测预警方法的重要前提。本文利用声发射与光纤光栅传感技术对岩溶塌陷形成过程展开模型试验,甄别与筛选声发射关键信号特征,并建立其与岩溶塌陷的响应机制。试验结果表明:(1)大雨条件下岩溶塌陷的形成演化过程里,覆盖层深部声发射信号振铃计数较浅部增大6.78~6.89倍,幅度增大1.02~1.12倍,能量扩大了4.45~16.6倍。在暴雨条件下,覆盖层深部声发射信号振铃计数较浅部增大14.85倍,幅度增大1.51倍,能量扩大了213.39倍;(2)大雨试验工况下是以土洞扩展并失稳破坏的蠕变破坏型岩溶塌陷,暴雨试验工况下是土层整体错断坍塌的压剪断裂型岩溶塌陷,不同塌陷类型的声发射信号特征有明显差异;(3)岩溶塌陷过程中会出现土体滑移、层面错动、孔洞发育和塌陷四类信号波形,信号波形释能幅值、上升与下降时间、波形持续时间等与岩溶塌陷演化过程土体变形密切相关;(4)岩溶塌陷过程中声发射频谱信号波形为高频窄脉冲,其中土体滑移、层面错动、孔洞发育和塌陷等四类信号频域能量分别集中在50kHz和20kHz左右的高频区段;(5)声发射累计振铃计数与覆盖层孔隙水压力、土压力和土体位移的变化过程存在紧密的关联性,在土体变形与塌陷时会导致声发射振铃计数增加或突发性跃迁现象,因此证明声发射技术用于岩溶塌陷监测预警是可行的。

     

  • 图  1  试验仪器与监测系统展示图

    Figure  1.  General diagram of the experimental equipment and monitoring system

    图  2  监测仪器布设与试验装置示意图

    Figure  2.  Schematic diagram of the experimental equipment and monitoring apparatus

    图  4  大雨条件下土体深层声发射参数特征

    Figure  4.  Characteristic of acoustic emission parameters in deeper overburden layer under heavy rain condition

    图  5  暴雨条件下土体浅层声发射参数特征

    Figure  5.  Characteristic of acoustic emission parameters in upper overburden layer under rainstorm condition

    图  6  暴雨条件下土体深层声发射参数特征

    Figure  6.  Characteristic of acoustic emission parameters in deeper overburden layer under rainstorm condition

    图  3  大雨条件下土体浅层声发射参数特征

    Figure  3.  Characteristic of acoustic emission parameters in upper overburden layer under heavy rain condition

    图  7  典型声发射信号时域图形

    Figure  7.  Typical signals of acoustic emission in time domain

    图  8  典型声发射信号频域图形

    Figure  8.  Typical signals of acoustic emission in frequency spectrum

    图  9  大雨条件下覆盖层多场耦合关联特征

    Figure  9.  Multi-field coupling characteristics of overburden layer under heavy rain condition

    图  10  暴雨条件下覆盖层多场耦合关联特征

    Figure  10.  Multi-field coupling characteristics of overburden layer under rainstorm condition

    表  1  试验材料基本物理力学指标

    Table  1.   The basic physical and mechanical indexes of the experimental material

    最优含水率
    $ \omega $/%
    最大干密度
    ${\rho }_{d}/g\cdot {cm}^{-1}$
    液限
    $ {W}_{L} $/%
    塑限
    $ {W}_{p} $/%
    塑性指数
    $ {I}_{p} $
    土粒比重
    $ {G}_{s} $
    压缩模量
    $ {E}_{s} $/Mpa
    30.21 1.46 51.24 34.34 19.9 2.725 10.11
    下载: 导出CSV
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  • 收稿日期:  2023-08-30
  • 录用日期:  2024-02-18
  • 修回日期:  2024-01-19
  • 网络出版日期:  2024-04-30

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