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都江堰-汶川公路汶川地震次生地质灾害主要特征和形成机理

甘建军 黄润秋 李前银 叶晓华 高文军

甘建军, 黄润秋, 李前银, 等, 2010. 都江堰-汶川公路汶川地震次生地质灾害主要特征和形成机理. 地质力学学报, 16 (2): 146-158.
引用本文: 甘建军, 黄润秋, 李前银, 等, 2010. 都江堰-汶川公路汶川地震次生地质灾害主要特征和形成机理. 地质力学学报, 16 (2): 146-158.
GAN Jian-jun, HUANG Run-qiu, LI Qian-yin, et al., 2010. FORMATION MECHANISM OF GEO-HAZARDS TRIGGERED BY WENCHUA MS8.0 EARTHQUAKE ALONG DUJIANGYAN-WENCHUAN HIGHWAY. Journal of Geomechanics, 16 (2): 146-158.
Citation: GAN Jian-jun, HUANG Run-qiu, LI Qian-yin, et al., 2010. FORMATION MECHANISM OF GEO-HAZARDS TRIGGERED BY WENCHUA MS8.0 EARTHQUAKE ALONG DUJIANGYAN-WENCHUAN HIGHWAY. Journal of Geomechanics, 16 (2): 146-158.

都江堰-汶川公路汶川地震次生地质灾害主要特征和形成机理

基金项目: 

国家重点基础研究发展计划(973计划)课题“强震作用下斜坡失稳机理及分布规律” 2008CB4 25901

国土资源部地灾应急调排查都汶路项目 20080629

详细信息
    作者简介:

    甘建军(1975-), 男, 博士研究生, 现就读于成都理工大学, 主要从事地质灾害防治的研究和实践工作。E-mail: Scdkj2006@126.com

  • 中图分类号: P694

FORMATION MECHANISM OF GEO-HAZARDS TRIGGERED BY WENCHUA MS8.0 EARTHQUAKE ALONG DUJIANGYAN-WENCHUAN HIGHWAY

  • 摘要: 汶川特大地震发生后, 都江堰至汶川公路两旁次生地质灾害尤为严重, 先后多次完全中断震中交通生命线, 严重地影响了公路的安全运行和灾后重建。通过对汶川地震前后都江堰-汶川公路边坡现场调查资料对比分析, 研究了该地段边坡的主要次生地质灾害类型及其破坏模式、形成机制和时空分布特点。破坏类型主要为碎屑流式、碎裂滑移式崩塌和碎裂-俯冲式、振荡-高速滑移式泥石流等, 造成沿线边坡发生大面积浅表生改造破坏。此类灾害具有丛集性、相关性、分段性的明显特点。成因复杂的高陡岩土体是次生地质灾害的主要物质基础;强烈的场地地震效应和内外动力耦合作用是该地区地质灾害成生的主要因素。

     

  • 图  1  都汶公路地质构造略图

    Figure  1.  A map showing the regional geology along the Dujiangyan-Wenchuan highway

    图  2  磨子沟典型沟谷型稀性泥石流

    Figure  2.  Typical valley-shape diluteddebris flow in Mozigou

    图  3  纸厂沟典型牵引式土质滑坡

    Figure  3.  Typical slumping mudslides in Zichanggou

    图  4  茅草坡碎屑流式崩塌及其剖面示意图

    Figure  4.  Typical debris flow to collapse and its sketch profile in Maocaopo

    图  5  响水岩碎裂滑移式崩塌

    Figure  5.  Typical cataclastic rocks to collapse in Xiangshuiyan

    图  6  磨子沟典型碎裂-俯冲式破坏模型

    Figure  6.  Failure mode for cataclasite-subduction type debris flow in Mozigou

    图  7  牛圈沟上游何家山振荡-高速滑移式泥石流模型

    ①第一个弯道碎屑流爬坡区; ②第二弯道碎屑流爬坡区; ③第三个弯道碎屑流爬坡区; ④冲积物滑床。

    Figure  7.  A oscillations high speed slippage model for mudslides in Niuquangou

    图  8  都江堰-汶川公路次生地质灾害分布图

    Figure  8.  A map showing distribution of geo-hazards along the sectionfrom Dujiangyan-Wengchuan Highway

    图  9  都汶路次生地质灾害年内分布曲线图

    Figure  9.  Distribution curve of geo-hazards along the Dujiangyan-Wenchuan Highway in the year

    图  10  都汶路次生地质灾害发育时间

    Figure  10.  Temporal distribution of geological hazardsin Dujiangyan-Wenchuan Highway

    图  11  都汶公路构造力作用示意图

    A图:叠瓦状剖面示意图  B图:次生地质灾害与活动断裂关系
    图 1.地表破裂缝; 2.都汶公路次生地质灾害点; 3.汶川特大地震震中; 4.东西向挤压导致的剪切力偶及断层走向; 5.汶川特大地震东西向挤压

    Figure  11.  A diagram of geodynamic cause of Wenchuan earthquake along Dujiangyan-Wenchuan HighwayA

    表  1  次生地质灾害分布与地层岩性的关系

    Table  1.   Relation between geo-hazard distribution and formation lithology

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  • 收稿日期:  2010-05-07
  • 刊出日期:  2010-06-28

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