关键词: 渗透破坏, 输水渠道, 管涌破坏, 流土, 南水北调中线工程

Abstract: Based on the investigation on seepage failure problems in the Middle Route Project of South-to-North Water Diversion, the main types of seepage failure phenomena of large conveyance canals were summarized as 5 main modes on the basis of the characteristics and appearance, namely the piping failure, soil flow, concentrated leakage, scattered leaching and lifting. Combined with the characteristics of large-scale water conveyance canals, the causes, prone sites, characteristics and incentives of 5 seepage failure types were analyzed in detail. Combined with the results of seepage calculation of a typical section of the Main canal of first-stage Middle Route Project of South-to-North Water Diversion, the possibility of seepage failure of the embankment was analyzed. The analysis concludes that it is necessary to comprehensively consider the factors such as seepage location, seepage direction, seepage medium, and seepage field characteristics when the possibility of seepage failures is analyzed.

Key words: seepage failure, water conveyance canal, piping failure, soil flow, Middle Route Project of South-to-North Water Diversion