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工程科学与技术:2009,41(3):72-77
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“5·12”汶川地震滑坡特征及失稳破坏模式分析
(西南交通大学 土木工程学院,四川 成都 610031)
Analysis on Characteristics and Deformation Failure Mode of Large-scale Landslides Induced by“5·12”Wenchuan Earthquake
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中文摘要: “5·12”汶川特大地震不仅大幅度降低了地震区斜坡的稳定性,而且还诱发了大量滑坡等地质灾害。通过对灾区地震滑坡灾害进行野外深入调查,对“5·12”大型典型地震滑坡的基本特征等进行归纳、总结,并以青川县东河口滑坡为例,对该大型滑坡的基本特征及失稳破坏模式进行分析。分析得出,东河口滑坡是一个强震作用下的高速远程型坡体运动,其运动阶段大致可分为启程滑动、近程飞越、碰撞和远程流动3个阶段。该滑坡的失稳破坏模式可简单概括为拉裂→裂纹扩展、趋于贯通→斜坡失稳、凌空滑出→滑坡解体、流动→堆积。
Abstract:The stability of slopes in earthquake disaster areas has not only been largely decreased by“5·12”Wenchuan earthquake, but also a large number of geological hazards such as landslides and so on, have been induced in the areas. On the basis of thoroughly surveying on the landslides induced by the earthquake in the disaster areas, basic characteristics of the typical landslides was summarized. Taking the Donghekou landslide of Qingchuan county as an example, basic characteristics and deformation failure mode of the large scale landslide was analyzed and discussed. The results showed that the landslide belongs to high speed and long distance slope movement in the action of intense earthquake. The movement stage can be approximately separated into three stages of sliding in setting out, flying and colliding of short distance, and flowing of long distance. The destabilization failure mode can be simply generalized into tension→crack extended, running through→slope instability and fiying off→landslide disaggregation, flowing→deposit.
文章编号:20090309     中图分类号:    文献标志码:
基金项目:中科院地震次生山地灾害应急考察资助项目(110900k291);国家自然科学基金资助项目(40802072);中科院西部之光人才培养计划项目(O8R2140140)
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李秀珍,孔纪名,邓红艳.“5·12”汶川地震滑坡特征及失稳破坏模式分析[J].工程科学与技术,2009,41(3):72-77.
.Analysis on Characteristics and Deformation Failure Mode of Large-scale Landslides Induced by“5·12”Wenchuan Earthquake[J].Advanced Engineering Sciences,2009,41(3):72-77.