文家坝大型单体滑坡地质特征遥感调查与稳定性分析
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摘要
平武县的文家坝滑坡是由汶川地震诱发,并曾阻断河流形成文家坝堰塞湖,威胁到下游南坝、锰矿厂和公路的安全,所以有必要对其地质特征进行调查及稳定性分析。通过对震后平武县SPOT卫星影像的解译,识别出了文家坝滑坡的地貌要素及滑坡物质组成,表面植被发育度,水文条件等地质特征。可以认为,文家坝滑坡为大型牵引式滑坡,目前仍处于不稳定状态,在余震、强降雨等条件下,有复滑的可能,并针对潜在威胁给出了具体的防治建议。
The Wenjiaba landslide of Pingwu County was triggered by Wenchuan earthquake,and when it occurred it has blocked the river and formed a barrier lake which brought the risky for Nanba town and a manganese factory at downstream.So it is necessary to investigate the geological features and to analysis the stability of the landslide.By interpreting a post-earthquake SPOT image of Pingwu County,the geological features,such as the geomorphic factors,the material composition,the vegetation coverage and the hydrological condition were identified.On the base of that,Wenjiaba landslide was considered as a large retrogressive landslide and was still not stable at present,it may be re-slide on a certain condition.Some prevention suggestions for potential risks was proposed in the final.
The Wenjiaba landslide of Pingwu County was triggered by Wenchuan earthquake,and when it occurred it has blocked the river and formed a barrier lake which brought the risky for Nanba town and a manganese factory at downstream.So it is necessary to investigate the geological features and to analysis the stability of the landslide.By interpreting a post-earthquake SPOT image of Pingwu County,the geological features,such as the geomorphic factors,the material composition,the vegetation coverage and the hydrological condition were identified.On the base of that,Wenjiaba landslide was considered as a large retrogressive landslide and was still not stable at present,it may be re-slide on a certain condition.Some prevention suggestions for potential risks was proposed in the final.
引文
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[6]中国地质调查局工作标准(DD 2004-02).区域环境地质调查总则(试行)[S].2004.
[2]王治华.遥感图像在滑坡调查中的应用,滑坡分析与防治[M].重庆:科学技术文献出版社,1984.
[3]王治华,徐起德,杨日红,等.宣汉天台乡滑坡遥感调查研究的初步结果[J].遥感信息,2004,4:75.
[4]吴文勋,蒋勇,唐伟,等.四川省平武县地质灾害补充调查与区划报告[R].成都:四川省冶金地质勘查局水文工程大队,2007.
[5]向俊红.概论滑坡稳定性影响因素[J].铁道勘察,2009,4:27.
[6]中国地质调查局工作标准(DD 2004-02).区域环境地质调查总则(试行)[S].2004.
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