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川西岷江河谷典型大型—巨型古滑坡特征物探解译分析

郭桥桥 郭长宝 申维 张国华 宋昊翔 周清强

郭桥桥, 郭长宝, 申维, 等, 2017. 川西岷江河谷典型大型—巨型古滑坡特征物探解译分析. 地质力学学报, 23 (5): 788-797.
引用本文: 郭桥桥, 郭长宝, 申维, 等, 2017. 川西岷江河谷典型大型—巨型古滑坡特征物探解译分析. 地质力学学报, 23 (5): 788-797.
GUO Qiaoqiao, GUO Changbao, SHEN Wei, et al., 2017. GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN. Journal of Geomechanics, 23 (5): 788-797.
Citation: GUO Qiaoqiao, GUO Changbao, SHEN Wei, et al., 2017. GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN. Journal of Geomechanics, 23 (5): 788-797.

川西岷江河谷典型大型—巨型古滑坡特征物探解译分析

基金项目: 

中国地质调查局项目 DD20160271

国家自然科学基金项目 41402321

详细信息
    作者简介:

    郭桥桥(1992-), 男, 硕士, 地质工程专业, 主要从事工程地质与地质灾害方面的研究。E-mail:qq0207@126.com

    通讯作者:

    郭长宝(1980-), 男, 博士, 副研究员, 主要从事工程地质与地质灾害方面的研究。E-mail:guochangbao@163.com

  • 中图分类号: P642.22

GEOPHYSICAL EXPLORATION AND SLIDING SURFACE DISCRIMINANT ANALYSIS OF LARGE-GIANT ANCIENT LANDSLIDES IN MINJIANG RIVER VALLEY, WESTERN SICHUAN

  • 摘要: 在遥感解译、野外调查的基础上,采用高密度电法和电阻率测深法,并结合钻探对川西岷江河谷发育的尕米寺滑坡、俄寨村滑坡、格机寨滑坡等典型大型—巨型古滑坡的空间结构进行了勘探分析,有效确定了古滑坡的空间结构和滑带特征,并认为古滑坡的滑动面多具有高低阻相间的不稳定电性层,且滑坡前缘多位于不稳定电性层变薄收敛的地方。其中,俄寨村滑坡高低阻相间的不稳定电性层厚约0~45 m,为滑坡堆积层,古滑动面紧贴基岩面,滑动面平均埋深约30 m,弱风化基岩面埋深约5.6~61 m,强风化层厚约为3~12 m;尕米寺滑坡高低阻相间的不稳定电性层厚约2.5~43 m,为滑坡堆积层,沿剖面古滑动面平均埋深约35 m,在滑坡中部存在一圈闭的低阻异常体,推测为古河道,并与钻探结果相吻合,其埋深约56~96 m,弱风化基岩面埋深13.3~100 m,强风化及岩溶综合层厚一般约为5~20 m。基于古滑坡的地球物理勘探数据和解译结果,统计分析了川西岷江河谷地区大型—巨型古滑坡空间岩土体的地球物理物性参数,对指导该区滑坡调查分析具有重要的指导意义。

     

  • 图  1  研究区及典型滑坡点位置图

    Figure  1.  Location map of the study area and typical landslide sites

    图  2  野外分析测试

    Figure  2.  Photos of typical fieldwork

    图  3  俄寨村滑坡平面图

    Figure  3.  Plan of Ezhaicun landslide

    图  4  俄寨村滑坡高密度电法物探成果图

    Figure  4.  Geophysical prospecting image of the Ezhaicun landslide by multi-electrode resistivity method

    图  5  尕米寺滑坡平面图

    Figure  5.  Plan of the Gamisi landslide

    图  6  尕米寺滑坡物探成果图

    Figure  6.  Geophysical prospecting image of the Gamisi landslide

    图  7  格机寨滑坡平面图

    Figure  7.  Plan of the Gejizhai landslide

    图  8  格机寨滑坡物探成果图

    Figure  8.  Geophysical prespecting image of the Gejizhai landslide

    图  9  古滑坡物探与钻探结果对比图

    Figure  9.  Comparison diagram of the results from geophysical prospecting and drilling of ancient landslide

    表  1  俄寨村滑坡物性参数

    Table  1.   Physical parameters of the Ezhaicun landslide

    岩土名称 测量电阻率/(Ω·m) 推测位置
    碎石土 75~5120 表层
    砂砾石土 280~620 滑动面
    炭质板岩 70~98 基岩
    砂质板岩 191~351 基岩
    下载: 导出CSV

    表  2  尕米寺滑坡物性参数

    Table  2.   Physical parameters of the Gamisi landslide

    岩土名称 测量电阻率/(Ω·m) 推测位置
    碎块石土 1564~2726 表层
    堆积层 500~1520 滑动面
    灰岩 1934~2470 基岩
    卵砾石 210~331 古河道
    下载: 导出CSV

    表  3  格机寨滑坡物性参数

    Table  3.   Physical parameters of the Gejizhai landslide

    岩土名称 测量电阻率(Ω·m) 推测位置
    黄土 75~320 表层
    砂砾石土 500~1520 滑动面
    炭质板岩 51~76 基岩
    砂质板岩 80~205 基岩
    注:表中电阻率是采用对称四极电测深装置采集到的数据统计得到的
    下载: 导出CSV
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  • 收稿日期:  2016-12-30
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