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    三峡库区典型滑坡地球物理实测及其意义:以万州区四方碑滑坡为例

    林松 王薇 邓小虎 查雁鸿 周红伟 程邈

    林松, 王薇, 邓小虎, 查雁鸿, 周红伟, 程邈, 2019. 三峡库区典型滑坡地球物理实测及其意义:以万州区四方碑滑坡为例. 地球科学, 44(9): 3135-3146. doi: 10.3799/dqkx.2019.074
    引用本文: 林松, 王薇, 邓小虎, 查雁鸿, 周红伟, 程邈, 2019. 三峡库区典型滑坡地球物理实测及其意义:以万州区四方碑滑坡为例. 地球科学, 44(9): 3135-3146. doi: 10.3799/dqkx.2019.074
    Lin Song, Wang Wei, Deng Xiaohu, Zha Yanhong, Zhou Hongwei, Cheng Miao, 2019. Geophysical Observation of Typical Landslides in Three Gorges Reservoir Area and Its Significance: A Case Study of Sifangbei Landslide in Wanzhou District. Earth Science, 44(9): 3135-3146. doi: 10.3799/dqkx.2019.074
    Citation: Lin Song, Wang Wei, Deng Xiaohu, Zha Yanhong, Zhou Hongwei, Cheng Miao, 2019. Geophysical Observation of Typical Landslides in Three Gorges Reservoir Area and Its Significance: A Case Study of Sifangbei Landslide in Wanzhou District. Earth Science, 44(9): 3135-3146. doi: 10.3799/dqkx.2019.074

    三峡库区典型滑坡地球物理实测及其意义:以万州区四方碑滑坡为例

    doi: 10.3799/dqkx.2019.074
    基金项目: 

    国家自然科学基金项目 41572354

    详细信息
      作者简介:

      林松(1983-), 男, 工程师, 硕士, 主要研究方向为地震地质和工程地震

      通讯作者:

      王薇, E-mail:smilevivi0821@163.com

    • 中图分类号: P315

    Geophysical Observation of Typical Landslides in Three Gorges Reservoir Area and Its Significance: A Case Study of Sifangbei Landslide in Wanzhou District

    • 摘要: 滑坡是最严重的地质灾害之一,查明滑坡形态特征及滑坡形成机制对于滑坡体稳定性分析、滑坡灾害风险管理和政府治理决策等方面具有重要意义.前人研究滑坡形态及其形成机制较少结合地球物理实测方法,其工程地质剖面绘制多局限于点信息的获取方式,而结合地球物理实测方法有利于从线、面同时获取更丰富的滑坡体地质信息,更加准确量化滑移面埋深和透视滑床形态.鉴于此,以灾害频发的三峡库区万州区为研究对象,采用网格高密度电法实测区内不同深度地层的电阻率值,并以此生成二维电阻率剖面和构建滑床三维形态;同时,将剖面电性分布特征与钻孔资料及地质调查资料相结合,对滑坡区地层结构、滑移面埋深以及滑床形态等多个影响滑坡的重要因素综合分析.结果表明,在研究区开展网格高密度电法实测工作,可获取地层电性结构特征以及构建滑坡体三维形态;实测剖面显示四方碑滑坡属于古滑坡,且存在拉裂槽现象.将实测剖面获取的滑移面埋深和构建的三维滑床形态进行钻孔标定,可对滑坡体内部结构及物质组成进行“透视”,从而为滑坡形成机制分析提供依据,同时也给其他类似区域地质调查中的滑坡稳定性评价及预测预报工作提供理论指导和技术参考.通过高密度电法揭示三峡库区典型滑坡体三维形态特征的理论方法和技术路线成功引入滑坡形成机制分析,可为研究滑坡形成机制和理论提供新思路,具有推广意义.

       

    • 图  1  万州区周围构造纲要图

      改自《长江山峡水利枢纽库区万县市迁建城镇新址地质论证报告》,长江水利委员会综合勘测局,1996

      Fig.  1.  The structural sketch map of Wanzhou district

      图  2  万州区“隔档式”褶皱带示意图

      刘雪梅(2010)

      Fig.  2.  Sketch of Jura⁃type fold in Wanzhou district

      图  3  四方碑滑坡平面图

      滑坡体边界参考肖婷等(2018)

      Fig.  3.  Plane map of Sifangbei landslide

      图  4  高密度电法观测系统

      Fig.  4.  High Density Electrical observation system

      图  5  数据处理流程

      Fig.  5.  Data processing flow

      图  6  a测线(a)和b测线(b)的电阻率剖面与地质解译

      Fig.  6.  Resistivity profile and geological interpretation of Line a(a)and Line b(b)

      图  7  h测线(a)和i测线(b)的电阻率剖面与地质解译

      Fig.  7.  Resistivity profile and geological interpretation of Line h(a)and Line i(b)

      图  8  不同视角网格电阻率剖面三维示意图

      Fig.  8.  3D sketch of grid resistivity profile with different view angles

      图  9  滑坡体及滑床三维形态特征

      Fig.  9.  3D morphological characteristics of landslide body and sliding bed

      图  10  四方碑AA’(a)和BB’ (b)工程地质剖面

      Fig.  10.  Engineering geological profile AA' (a) and profile BB' (b) of Sifangbei landslide

      表  1  研究区地层岩性

      Table  1.   Summary of stratigraphic lithology in the study area

      地层代号 厚度(m) 岩性描述
      第四系 Q 0.5~90.0 人工堆积、冲洪积、崩积、坡积、残坡积及滑坡堆积物
      侏罗系 上统 遂宁组 J3s > 10.0 泥质粉砂岩、紫红色泥岩、褐红色粉砂岩细粒长石砂岩
      中统 上沙溪庙组
      第二段
      J2s2 > 25.0 褐红色粉细砂岩夹紫红色泥岩、紫灰色长石石英砂以岩及泥质粉砂岩
      上沙溪庙组
      第三段
      J2s3 7.0~50.0 褐红、灰绿色细砂岩,粉砂岩,紫红杂灰黄粉砂质粘土岩及泥岩
      下载: 导出CSV
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    • 收稿日期:  2019-02-26
    • 刊出日期:  2019-09-15

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