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开挖和降雨耦合诱发滑坡机理分析

蒋涛 崔圣华 冉耀

蒋涛,崔圣华,冉耀. 开挖和降雨耦合诱发滑坡机理分析−以四川万源前进广场滑坡为例[J]. 中国地质灾害与防治学报,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202207025
引用本文: 蒋涛,崔圣华,冉耀. 开挖和降雨耦合诱发滑坡机理分析−以四川万源前进广场滑坡为例[J]. 中国地质灾害与防治学报,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202207025
JIANG Tao,CUI Shenghua,RAN Yao. Analysis of landslide mechanism induced by excavation and rainfall: A case study of the Qianjin Square landslide in Wanyuan city, Sichuan province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202207025
Citation: JIANG Tao,CUI Shenghua,RAN Yao. Analysis of landslide mechanism induced by excavation and rainfall: A case study of the Qianjin Square landslide in Wanyuan city, Sichuan province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202207025

开挖和降雨耦合诱发滑坡机理分析

doi: 10.16031/j.cnki.issn.1003-8035.202207025
基金项目: 国家自然科学基金资助(41907254)
详细信息
    作者简介:

    蒋涛:蒋 涛(1998-),男,硕士研究生,主要从事滑坡机理等方面研究工作。E-mail:jiang_tao@stu.cdut.edu.cn

    通讯作者:

    崔圣华(1989–),男,副教授,博士,主要从事地震大型滑坡形成机制等方面的研究工作。E-mail:cuicuishenghua18@cdut.edu.cn

  • 中图分类号: P642.2

Analysis of landslide mechanism induced by excavation and rainfall: A case study of the Qianjin Square landslide in Wanyuan city, Sichuan province

  • 摘要: 近年来人类工程活动和降雨环境耦合诱发地质灾害事件频发,而偶合作用机制研究还待深入。本文以开挖和降雨耦合诱发的万源前进广场滑坡为例,结合前进广场滑坡地表位移及深部位移监测数据和降雨数据分析滑坡变形破坏特征和形成机理。研究表明:(1)前缘基坑的开挖是导致老滑坡复活最主要的原因,降雨起到了激发作用和加速作用;(2)前缘基坑开挖一方面为滑坡提供了良好的临空面条件,另一方面导致后方土体失去支撑,导致滑坡由前致后产生多级台坎状拉裂下错变形;(3)基坑开挖后,研究区长时间强-中降雨,开挖导致的张拉裂缝让地表水更容易进入坡体内部,一方面基岩裂隙水受大气降雨补给,导致部分非饱和土变为饱和土、承压水压力增大、有效应力下降,另一方面,部分地下水可能到达滑带,驱动变形发展。最终提出了由于斜坡前缘基坑开挖与降雨耦合导致滑坡的“基坑开挖-斜坡多级拉裂-集中降雨-滑带弱化-加速变形”过程机制。
  • 图  1  万源市地质构造图

    Figure  1.  Geological formation map of Wanyuan City

    图  2  滑坡区航拍图

    Figure  2.  Aerial view of the landslide area

    图  3  滑坡区1-1’工程地质剖面图

    Figure  3.  Engineering geological cross-section profile of landslide zone 1-1'

    图  4  变形体中部和下部区域地下水等值线图

    Figure  4.  Contour map of groundwater level

    图  5  前进广场滑坡工程地质平面图

    Figure  5.  Geological formation map of the landslide Engineering in the Qianjin Square area

    图  6  地表位移监测数据

    Figure  6.  Ground surface displacement monitoring data

    图  7  IN01、IN03深部监测数据

    Figure  7.  Deep displacement monitoring data of IN01, IN03

    图  8  IN04、IN07深部监测数据

    Figure  8.  Deep displacement monitoring data of IN04, IN07

    图  9  IN06、IN08深部监测数据

    Figure  9.  Deep displacement monitoring data of IN06, IN08

    图  10  2019年日降雨量

    Figure  10.  Daily precipitation in the Year of 2019

    图  11  地下水位监测情况

    Figure  11.  Groundwater level monitoring plot

    图  12  坡体地表位移与降雨量关系图

    Figure  12.  Slope surface displacement and rainfall relationship diagram

    图  13  前进广场滑坡演化模式图

    Figure  13.  The evolutionary pattern of landslide in the Qianjin Square area

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  • 收稿日期:  2022-07-15
  • 录用日期:  2023-03-30
  • 修回日期:  2023-03-11
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