5·12汶川地震诱发都江堰龙池镇干沟泥石流可能性地质分析
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摘要
岷江一级支流龙溪河右岸次级支流干沟,位于四川省都江堰市龙池镇,沟口为5·12汶川地震后都江堰龙池镇主要过渡安置房集中居住区。根据流域地质地貌条件,5·12地震诱发崩塌、滑坡山地地质灾害特征及泥石流发育历史等方面,分析预测了干沟震后暴发大规模泥石流的可能性及其危害性。研究表明,干沟为一多期次泥石流沟,其中两次在沟口形成了规模巨大的泥石流堆积扇;流域内5·12地震滑坡、崩塌极为发育,固体碎屑物质极为丰富,在持续强暴雨下有发生大规模泥石流的极大可能,将对沟口过渡安置房集中居住区带来严重危害。据此,提出了停建干沟沟口过渡安置房等建议。
Gangou is the right-bank secondary branch of Longxi river which is first grade tributary flowing of Minjiang, located in Longchi town in Dujiangyan in Sichuan. The toe of Gangou is the area of under-construction transition settlement building of Longchi town in Dujiangyan after the earthquake of May 12. This paper according to the regional geological and landform, the characteristics of falling and landslide hazards induced by the earthquake of May 12 and the growth history of debris flow, analysis and forecast the possibility and harmfulness of debris flow. The result show, Gangou is multi-stages debris flow gully, twice formed huge-scale debris fans in the toe of the gully; Landslide and collapse induced by the earthquake of May 12 development very much in basin interior of Gangou, solid and fragmentary material are very rich, there have maximum possibility of happening large-scale debris flow in continuous heavy rainfall, it will endanger the transition settlement building in the toe of gully. So, we propose stop construction the transition.
Gangou is the right-bank secondary branch of Longxi river which is first grade tributary flowing of Minjiang, located in Longchi town in Dujiangyan in Sichuan. The toe of Gangou is the area of under-construction transition settlement building of Longchi town in Dujiangyan after the earthquake of May 12. This paper according to the regional geological and landform, the characteristics of falling and landslide hazards induced by the earthquake of May 12 and the growth history of debris flow, analysis and forecast the possibility and harmfulness of debris flow. The result show, Gangou is multi-stages debris flow gully, twice formed huge-scale debris fans in the toe of the gully; Landslide and collapse induced by the earthquake of May 12 development very much in basin interior of Gangou, solid and fragmentary material are very rich, there have maximum possibility of happening large-scale debris flow in continuous heavy rainfall, it will endanger the transition settlement building in the toe of gully. So, we propose stop construction the transition.
引文
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[2]Shen Junhui1,Li Yonglin,Wang Xiaoqun,et al.The debris flow haz-ards of the tunnel in Erlang Mountain and its prevention[J].The Chinese Journal of Geological Hazard and Control,2005,16(2):58~62[沈军辉,李永林,王小群,等.二郎山公路隧道泥石流地质灾害及防治[J].中国地质灾害与防治学报,2005,16(2):58~62]
[3]Chen Xiaoqin,Li Yong,Cui Peng.An overview of transformation of landslide into debris flows[J].Journal ofMountain Science,2004,22(5):562~567[陈晓清,李泳,崔鹏.滑坡转化泥石流起动研究现状[J].山地学报,2004,22(5):562~567]
[4]Cui Peng,Zhong Dunlun,Li Yong.Landslide and debris flowin Ze-zu,Meigu county,Sichuan Province[J].Mountain Research.1997,15(4):282~287[崔鹏,钟敦伦,李泳.四川美姑则租滑坡泥石流[J].山地研究(现山地学报),1997,15(4):282~287]
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