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秦巴山区浅层滑坡内动力地质成因分析

熊炜 刘可 范文

熊炜, 刘可, 范文, 2018. 秦巴山区浅层滑坡内动力地质成因分析. 地质力学学报, 24 (3): 424-431. DOI: 10.12090/j.issn.1006-6616.2018.24.03.044
引用本文: 熊炜, 刘可, 范文, 2018. 秦巴山区浅层滑坡内动力地质成因分析. 地质力学学报, 24 (3): 424-431. DOI: 10.12090/j.issn.1006-6616.2018.24.03.044
XIONG Wei, LIU Ke, FAN Wen, 2018. ANALYSIS ON INTERNAL DYNAMIC GEOLOGICAL GENESIS OF SHALLOW LANDSLIDE IN QIN-BA MOUNTAIN AREA. Journal of Geomechanics, 24 (3): 424-431. DOI: 10.12090/j.issn.1006-6616.2018.24.03.044
Citation: XIONG Wei, LIU Ke, FAN Wen, 2018. ANALYSIS ON INTERNAL DYNAMIC GEOLOGICAL GENESIS OF SHALLOW LANDSLIDE IN QIN-BA MOUNTAIN AREA. Journal of Geomechanics, 24 (3): 424-431. DOI: 10.12090/j.issn.1006-6616.2018.24.03.044

秦巴山区浅层滑坡内动力地质成因分析

doi: 10.12090/j.issn.1006-6616.2018.24.03.044
基金项目: 

国家自然科学基金 41502288

国家自然科学基金 41272282

广西交通投资集团有限公司博士后基金 2014

中国地质调查局地质调查工作项目 1212011220135

中央高校基本科研业务费专项资金资助 310826161015

详细信息
    作者简介:

    熊炜(1984-), 男, 博士, 讲师, 主要从事地质灾害机理与防控研究。E-mail:phdxiong@163.com

    通讯作者:

    刘可(1967-), 男, 博士, 教授级高级工程师, 从事高速公路建设管理工作。E-mail:dr_lk@163.com

  • 中图分类号: P642.22

ANALYSIS ON INTERNAL DYNAMIC GEOLOGICAL GENESIS OF SHALLOW LANDSLIDE IN QIN-BA MOUNTAIN AREA

  • 摘要: 以秦巴山区安康市汉滨区洪山镇淀沟浅层滑坡为例,通过区域宏观构造、边坡细观结构、岩石微观构造等多种尺度详细剖析浅层滑坡的变形破坏特征及内动力地质成因。研究表明:秦巴山区浅层滑坡的成因机理与内动力地质条件密不可分。滑坡多发育于软弱变质岩区,受区域构造活动影响,褶皱、断层等宏观构造在区内连续、交错分布,造成岩石内部的矿物发生变形、拉长、剪断等,形成韧性剪切带,并产生大量微裂隙,多期次岩脉填充交切,使岩体性质更加劣化。当应力超过岩石强度时,内部片层状结构发生弯曲、折断、压裂等一系列微观变形,是变质岩主要的变形破坏方式。区内断层与滑坡斜交,岩层及褶皱枢纽产状与滑坡坡向同向同倾,也为滑坡的形成提供了良好的孕灾条件。这种相对脆弱的地质环境再受到人类活动和降雨等外动力因素影响,极易引发浅层滑坡,进而对附近居民及建筑物产生严重威胁。

     

  • 图  1  滑坡后缘基岩

    Figure  1.  Bedrock of trailing edge of the Diangou landslide

    图  2  滑坡工程地质图

    1—滑坡周界;2—本次滑动范围;3—逆断层;4—裂缝;5—陡坎;6—剖面线

    Figure  2.  Engineering geological map of the Diangou landslide

    图  3  滑坡区域地质构造图(据1 : 5万地质图修改)

    1—耀岭河组;2—鲁家坪组;3—箭竹坝组;4—洞河组;5—二长岩;6—滑坡;7—韧性剪切带;8—逆断层;9—平移断层

    Figure  3.  Geological structure map of the landslide area (Modified after 1 : 50000 geological map)

    图  4  实测地质剖面图

    1—云母片岩;2—碳质片岩;3—含碳硅钙质板岩;4—含碳云母石英片岩;5—韧性剪切带;6—采样位置及样品编号;7—断层;8—褶皱变形;9—共轭节理赤平投影;10—滑坡

    Figure  4.  Measured geological profile

    图  5  褶皱枢纽等密图

    Figure  5.  Contour diagram of fold hinge

    图  6  矿物被拉长(SPIB-4,正交偏光)

    Figure  6.  Stretched minerals (SPIB-4, crossed polar)

    图  7  节理等密图

    Figure  7.  Contour diagram of joints

    图  8  岩石的微观构造(正交偏光)

    Figure  8.  Microscopic structure of rocks(crossed polar)

    图  9  变形破坏前微观形态

    Figure  9.  Morphology before deformation and failure

    图  10  岩石变形破坏微观模式

    Figure  10.  Rock microscopic deformation and failure mode

    表  1  岩样软化性质试验结果表

    Table  1.   The results of rock softening property test

    组号 状态 片理面关系 单轴抗压强度/MPa 软化系数
    试验值 均值
    1 1 干燥 垂直 27.1 28.6 0.60
    2 22.2
    3 36.4
    2 4 饱和 垂直 18.9 17.2
    5 16.3
    6 16.3
    3 7 干燥 平行 30.4 26.2 0.40
    8 22.0
    9 26.0
    4 10 饱和 平行 11.8 10.6
    11 8.3
    12 11.7
    下载: 导出CSV

    表  2  岩石自由膨胀率试验结果表

    Table  2.   The results of rock free expansion rate test

    组号 浸水前尺寸/mm 浸水后尺寸/mm 径向膨胀率/% 轴向膨胀率/%
    边长 高度 边长 高度
    1 50.12 98.65 50.25 98.85 0.259 0.202
    2 50.78 100.43 50.91 100.66 0.256 0.229
    3 51.02 99.98 51.13 100.18 0.215 0.200
    4 49.67 101.34 49.79 101.54 0.241 0.197
    下载: 导出CSV

    表  3  岩石强度劣化试验结果表

    Table  3.   The results of rock strength degradation test

    条件 组号 单轴抗压强度/MPa 与初始强度比值
    试验值 均值
    初始 1 27.2 28.63 100
    2 22.2
    3 36.5
    循环6次 4 25.3 26.53 87.19
    5 30.2
    6 24.1
    循环12次 7 22.4 24.47 82.65
    8 26.7
    9 24.3
    循环18次 10 25.7 22.6 80.33
    11 22.3
    12 19.8
    循环24次 13 21.0 21.17 78.58
    14 18.8
    15 23.7
    下载: 导出CSV
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  • 收稿日期:  2018-02-11
  • 修回日期:  2018-04-08
  • 刊出日期:  2018-06-28

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