云南虎跳峡大塘子松散堆积体滑坡形成演化机制分析
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摘要
大塘子滑坡属于我国西南地区典型的第四纪崩坡积松散堆积体滑坡.从滑坡的发育特征调查和资料收集入手,研究了该滑坡的形成条件和演化机制,分析认为降雨和地震联合作用诱发滑坡的产生,且滑坡具有明显的周期性,其形成过程经历"碎石体堆积-自然休止状态-显著滑动"3个演化阶段,存在再次滑动的可能性,其周期长短主要受降雨强度和地震活动的影响.这一结果对于合理部署区域防灾减灾具有指导意义.
Datangzi landslide is a typical Quaternary period loose congeries landslide in Southwest China.The detailed studies of the forming condition and evolvement mechanism of Datangzi landslide were carried out based on in-situ surveys and data collection.It is shown that the combination of prolonged rainfall and the Lijiang earthquake should be the main cause of the landslide;and the landslide may revive in some day.One development process includes three main phases such as avalanche accumulation,nature inactivity and gliding;and its cycle length is mainly affected by rainfall intensity and the impact of seismic activities.This study will provide a practical example for alleviating and preventing geo-hazards in Southwest China.
Datangzi landslide is a typical Quaternary period loose congeries landslide in Southwest China.The detailed studies of the forming condition and evolvement mechanism of Datangzi landslide were carried out based on in-situ surveys and data collection.It is shown that the combination of prolonged rainfall and the Lijiang earthquake should be the main cause of the landslide;and the landslide may revive in some day.One development process includes three main phases such as avalanche accumulation,nature inactivity and gliding;and its cycle length is mainly affected by rainfall intensity and the impact of seismic activities.This study will provide a practical example for alleviating and preventing geo-hazards in Southwest China.
引文
[1]唐川,黄楚兴,万晔.云南省丽江大地震及其诱发的崩塌滑坡灾害特征[J].自然灾害学报,1997,6(3):76-84.
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[4]余仁祥,刘汉超.重庆市麻柳嘴滑坡复活机制探讨[J].中国地质灾害与防治学报,2001,12(4):53-57.
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[6]韩新民,周瑞琦.丽江7.0级地震的烈度分布[J].地震研究,1997,20(1):35-46.
[2]夏金梧,周乐群,胡宗云.金沙江虎跳峡河段水电开发中存在的主要地质问题[J].人民长江,1997,28(12):29-31.
[3]冯树勇.第四纪工程地质学与西南河床深厚覆盖层研究[D].北京:中国科学院地质与地球物理研究所,1999.
[4]余仁祥,刘汉超.重庆市麻柳嘴滑坡复活机制探讨[J].中国地质灾害与防治学报,2001,12(4):53-57.
[5]刘衡秋,胡瑞林,朱志刚等.金沙江虎跳峡斜坡演变的内外动力耦合作用模式探讨[A].第三届全国岩土与工程学术大会论文集[C].成都:四川科学技术出版社,2008.
[6]韩新民,周瑞琦.丽江7.0级地震的烈度分布[J].地震研究,1997,20(1):35-46.
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