【摘要】 岷江上游分布有大量的古滑坡堵江形成的土石坝体。本文首先调查了扣山古滑坡堵江坝形成的地质环境和坝体的几何特征、溃口形态;然后采取坝体土石样品,进行了室内大型土工试验,考虑湖水、坝体渗流和岩土体的耦合作用,采用有限元进行了古滑坡堵江坝的稳定性分析,计算了溃坝洪水的最大洪流量及其洪水在下游的演化特征,认为该天然滑坡堵江坝的溃决方式为漫坝瞬时全溃,天然土石坝的溃决将对沿岸及下游地区的生态环境产生巨大的影响。更多还原

【Abstract】 <Abstrcat>Based on site investigate and the results of lab large-scale test of sample,this paper analyses the stability of natural rock-filled dam through the calculation of Plaxis and forecasts the peak flow of dam-break flood,and comes to the conclusions: the dam-break mode may be an instant break in whole, the peak flow is about 50×10~4 m~3/s at the dam site, and about 5×10~4 m~3/s away 100 km in the dam downstream. The flood height is about 50 m in 100 km the dam downstream. The dam-break had caused great effect to environmental of areas of along side and lower river, and possibly is the genesis of Chengdu clay.更多还原