清江中游清滩沟泥石流成因分析  

Analysis of formative causes of Qingtangou debris flow in mid-reach area of Qingjiang river

作　　者：黎义勇[1] 赵信文[1] 彭轲[1] 金维群[1] 黎清华[1] 王世昌[1] 

机构地区：[1]中国地质调查局武汉地质调查中心,湖北武汉430223

出　　处：《人民长江》2011年第9期47-49,共3页Yangtze River

基　　金：国家地质大调查项目"湘鄂桂山区地质灾害详细调查"(1212010740604)

摘　　要：为了解清滩沟泥石流的稳定状态,以便为采取何种工程治理措施提供科学依据,对其形成原因及稳定性进行了调查分析。清滩沟泥石流沟的形成原因与地形地貌、降雨等因素有关,地形条件的控制对清滩沟泥石流的形成起着至关重要的作用,由于清滩沟两侧边坡松散堆积物厚度较厚,坡度较陡,水流对沟谷的冲刷导致滑坡,滑坡堆积物成为清滩沟泥石流新的物质来源。经过对清滩沟泥石流沟的地面调查发现,清滩沟泥石流属于暴雨型、山洪型泥石流,其发展形式具有高频率、多期发展性。随着大气降雨强度、频度的不断发展变化,其危险性不断加大,清滩沟泥石流处于不稳定状态。In order to understand the stable state of Qingtangou debris flow and provide scientific basis for the selection of engineering measures,we investigate and analyze its formative causes and stability.The formative cause of Qingtangou debris flow is relevant to the factors such as topography and rainfalls,and the topography control condition plays a critical and important role in the formation of Qingtangou debris flow.As the thick loose deposits on both sides of Qingtangou slope and its steep slope,the landslide can be easily induced by the scour of slope and gully,and the landslide deposits become the new material source of Qingtangou debris flow.Through the ground-survey of the debris flow,we discover that the Qingtangou debris flow can be characterized as rainstorm type and torrential flood type,and its development form is of high frequency and multiple periods.With the continuous change and development of the intensity and frequentness of atmospheric rainfalls,the danger of debris flow is increasing,and the debris flow is in an instable status.

关 键 词：泥石流 成因分析 高频率 多期次 稳定性 清滩沟 清江中游地区 

分 类 号：TU457[建筑科学—岩土工程]