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乐山市张村沟泥石流工程地质特征及成因机制分析 被引量:2

Analysis of engineering geological characteristics and formation mechanism of debris flow in Zhangcungou,Leshan City
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摘要 泥石流具有形成过程复杂、暴发性强、破坏力大等特点,查明单沟泥石流工程地质特征,分析其灾害现状,并预测其潜在发展趋势,对泥石流防治具有重要意义。以大渡河东岸乐山市金河口区张村沟泥石流为例,通过对泥石流的地形地貌条件、沟道条件、岩土体条件、物源条件、水源条件、冲淤特征及堆积物特征调查,对地貌、物源特征、堆积区特征等因素进行了详细分析,并结合历史遥感影像资料综合分析了张村沟泥石流的成因机制,预测了其发展趋势。结果表明:①张村沟泥石流沟谷两岸斜坡陡峻,沟道沟床纵比降较大,汇水区面积大,降雨集中,且沟道内常年有流水,为泥石流形成提供了地形与水源条件。②沟域中下游地段两岸斜坡稳定性较差,多发育不稳定斜坡、滑坡等不良地质现象,为泥石流物源主要供给段。③张村沟泥石流沟目前还是一条“年轻”的泥石流沟,仍处于形成阶段,受该区地形地貌及地质环境条件控制,未来在强降雨及暴雨作用下可能会再次暴发更强的泥石流。研究成果可为类似泥石流防治提供一定参考。 Debris flow has the characteristics of complicated formation process,strong outbreak and great destructive power.Finding out the engineering geological characteristics of the debris flow,analyzing its disaster status and predicting its potential development trend are of great significance to the prevention and control of debris flows.Taking the debris flow in Zhangcungou,Jinhekou District,Leshan City,on the east bank of the Dadu River as an example,the terrain and geomorphic conditions,channel conditions,rock and soil conditions,material sources conditions,water source conditions,erosion and deposition characteristics and deposit characteristics of the debris flow were investigated.The geomorphology,material sources characteristics,accumulation area characteristics and other factors were analyzed in detail.Combining with historical remote sensing image data,the cause mechanism of the debris flow in Zhangcungou was comprehensively analyzed,and its development trend was predicted.The results show that:①The steep slope banks of the valley,the large longitudinal gradient of the channel bed,the large catchment area,the concentrated rainfall,and flowing water in the channel all the year around provide topography and water source conditions for the formation of the debris flow.②The slopes on both sides of the middle and lower reaches of the ditch are of poor stability,and there are often unstable slopes,landslides and other unfavorable geological phenomena,which are the main supply sections of debris flow sources.③The Zhangcungou debris flow ditch is still a“Young”debris flow ditch,which is still in its formation stage.Under the control of the topography and geological environment conditions in the area,in the future,a stronger debris flow may erupt again under the action of heavy rainfall and heavy rain.The research results can provide a certain reference for the prevention and control of similar debris flows.
作者 严映峰 何朝阳 解明礼 崔巍 王恺毅 靳帅 YAN Yingfeng;HE Chaoyang;XIE Mingli;CUI Wei;WANG Kaiyi;JIN Shuai(Guoneng Dadu River Zhentouba Power Generation Co.,Ltd.,Leshan 614000,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处 《人民长江》 北大核心 2021年第10期152-158,共7页 Yangtze River
基金 国家重点研发计划项目(2018YFC1504905,2018YFC1505105) 国家自然科学基金创新研究群体项目(41521002)。
关键词 泥石流 工程地质特征 成因机制 乐山市 大渡河 debris flow engineering geological condition formation mechanism Leshan City Dadu River
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