汶川地震诱发大型滑坡分布规律研究

许强 李为乐

许强, 李为乐. 2010: 汶川地震诱发大型滑坡分布规律研究. 工程地质学报, 18(6): 818-826.
引用本文: 许强, 李为乐. 2010: 汶川地震诱发大型滑坡分布规律研究. 工程地质学报, 18(6): 818-826.
XU Qiang, LI Weile. 2010: DISTRIBUTION OF LARGE-SCALE LANDSLIDES INDUCED BY THE WENCHUAN EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 18(6): 818-826.
Citation: XU Qiang, LI Weile. 2010: DISTRIBUTION OF LARGE-SCALE LANDSLIDES INDUCED BY THE WENCHUAN EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 18(6): 818-826.

汶川地震诱发大型滑坡分布规律研究

基金项目: 

国家重点基础研究发展计划课题(2008CB425801)、教育部创新团队发展计划(IRT0812)、地质灾害防治与地质环境保护国家重点实验室自主研究课题

详细信息
    作者简介:

    许强,主要从事地质灾害预测评价及防治处理方面的教学与研究工作.Email: xuqiang_68@126.com

  • 中图分类号: P642.2; TU43

DISTRIBUTION OF LARGE-SCALE LANDSLIDES INDUCED BY THE WENCHUAN EARTHQUAKE

  • 摘要: 2008年5 12汶川地震由于其超常的地震动力,触发了数百处大型滑坡灾害。本文以遥感解译所获取的汶川地震区112处面积大于50000m2大型滑坡的基本信息为基础,结合代表性大型滑坡实例的现场调绘,对汶川地震诱发大型滑坡的发育分布规律进行了较系统的研究。结果表明,汶川地震大型滑坡分布除表现出与汶川地震诱发区域性地质灾害类似的分布规律之外,因主要源于发震断层瞬间大幅度错动的直接地震动力引发的大型滑坡,其发育分布及滑动、运动方式还表现出自身的特点,具体可归结为以下几种效应: (1)距离效应:约80%的大型滑坡集中分布于发震断裂地表破裂带两侧5km的范围内,距离越远,滑坡分布数量越少; (2)锁固段效应:汶川地震诱发的大型滑坡主要集中分布在与发震断裂的交叉、错列、转换部位及NE段末端等5个集中区段。其中,红白-茶坪段是大型滑坡最为集中发育段,不仅滑坡数量多,而且规模大,汶川地震诱发的最大两处滑坡均分布于此段。其次为断裂NE段末端的南坝-东河口段,该段大型滑坡密集发育,东河口滑坡和窝前滑坡等大型滑坡均出露于此段; (3)上下盘效应:绝大多数(70%)大型滑坡都位于活动断裂的上盘,存在明显的上下盘效应; (4)方向效应:在与发震断裂带近于垂直的沟谷斜坡中,在地震波传播的背坡面一侧的滑坡发育密度明显大于迎坡面一侧,存在背坡面效应。同时,大型滑坡的滑动及运动方向还与各区段断层的错动方向有一定的相关性。在断层活动以右旋走滑为主的青川境内,有相当数量的滑坡表现出向NE方向滑动和运动的特点。
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出版历程
  • 收稿日期:  2010-04-25
  • 修回日期:  2010-10-15
  • 刊出日期:  2010-12-25

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