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不当钻探施工引发的滑坡变形加剧机理

罗晓娟

罗晓娟. 2021: 不当钻探施工引发的滑坡变形加剧机理. 中国地质灾害与防治学报, 32(3): 84-90. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-11
引用本文: 罗晓娟. 2021: 不当钻探施工引发的滑坡变形加剧机理. 中国地质灾害与防治学报, 32(3): 84-90. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-11
Xiaojuan LUO. 2021: Mechanism of the landslide deformation due to drilling of boreholes:A case study of Fanshantou landslide at Songyang County of Zhejiang Province. The Chinese Journal of Geological Hazard and Control, 32(3): 84-90. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-11
Citation: Xiaojuan LUO. 2021: Mechanism of the landslide deformation due to drilling of boreholes:A case study of Fanshantou landslide at Songyang County of Zhejiang Province. The Chinese Journal of Geological Hazard and Control, 32(3): 84-90. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-11

不当钻探施工引发的滑坡变形加剧机理

doi: 10.16031/j.cnki.issn.1003-8035.2021.03-11
详细信息
    作者简介:

    罗晓娟(1982-),女,湖北宜昌人,硕士,高级工程师,主要从事高边坡与地质灾害防治相关研究。E-mail:253885502@qq.com

  • 中图分类号: P642.22

Mechanism of the landslide deformation due to drilling of boreholes:A case study of Fanshantou landslide at Songyang County of Zhejiang Province

  • 摘要: 浙江省松阳县范山头滑坡是具有两层滑动带的中型土质滑坡,地质条件复杂,2010年初次发现之后,一直处于蠕动变形阶段。2018年7月开始对其采取虹吸排水工程治理。在治理施工过程中,钻探用水大量漏失,导致滑坡深部出现57~74 mm的累计变形量直至测斜孔剪断,滑坡地表裂缝最大宽度达到了17.5 mm。停止钻探,启动虹吸排水之后,滑坡裂缝停止扩大,深部位移量控制在了1 mm之内。本文基于此次实际抢险过程中的各项监测数据,分析蠕动型滑坡对地下水径流场变化的双向响应过程,并应用水力学和有效应力原理对这个响应过程进行机制分析。得出了在设计计算和工程实践中,必须充分考虑地下水径流渗透力,不可盲目忽略不计的结论,并再次验证排出滑坡体内的地下水是增强滑坡稳定性的快速有效手段之一。
  • 图  1  范山头滑坡平面图

    Figure  1.  Map of Fanshantou Landslide

    图  2  范山头滑坡主剖面图

    Figure  2.  Main Profile of Fanshantou Landslide

    图  3  范山头滑坡物探剖面

    Figure  3.  Projective Profile of Fanshantou Landslide

    图  4  位移、降雨量监测数据

    Figure  4.  Surface displacement monitoring and rainfall monitoring data

    图  5  降雨量方格图(2018年10月)

    Figure  5.  Chart of rainfall distribution in October 2018

    图  6  施工期裂缝宽度曲线图

    Figure  6.  Chart of cracks during construction

    图  7  钻孔深部位移曲线图

    Figure  7.  Variation of the accumulative subsurface displacement with depth measured using a borehole inclinometer

    图  8  范山头滑坡水文地质剖面图

    Figure  8.  Hydrogeology profile of Fanshantou landslide

    图  9  虹吸排水后滑坡地下水位变化图(监测SC02孔)

    Figure  9.  Changes of groundwater level after siphon drainage

    图  10  虹吸排水后裂缝宽度曲线图

    Figure  10.  Chart of cracks after siphon drainage

    表  1  范山头滑坡裂缝统计表

    Table  1.   List of Characteristics of Cracks

    裂缝走向/(°)条数比例/%发育部位形态
    100~1203251.6滑坡体中部、后缘直线形
    5~301727.4滑坡体右翼和前部直线形
    150~1751117.7滑坡体左翼直线形
    8111.61滑坡体后缘弧形
    13011.61滑坡体后缘弧形
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-08-18
  • 修回日期:  2020-12-21
  • 刊出日期:  2021-06-25

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