【摘要】 额稀沟为雅砻江右岸一级支流,位于雅江县城北,近沟口一带及其沟口下游雅砻江两岸残存发育有堆积体。从堆积体总体分布形态、堆积体成分及结构的空间变化特征,恢复了发生于末次冰期晚期的额稀沟巨大古洪积扇,并根据洪积物的物质组成及结构特征,合理选取了岸坡坍岸预测的计算参数,计算参数选取实验数值中偏大值。采用geo-slope软件自动搜索危险滑面和王跃敏的图解法,预测了Ⅳ区堆积体岸坡在牙根水库蓄水条件下坍岸范围,结果表明:2602m水位条件下坍岸宽度为28m,仅比2587m蓄水位条件下坍岸宽度20m扩大了8m。成果将直接应用于雅江县安全评价、县城搬迁范围划定以及牙根水库2587m、2602m水位线比选,亦对雅江县城环境地质条件认识具有一定意义。更多还原

【Abstract】 Exi Ravine is first grade tributary flowing of Yalongjiang,locates in north of the Yajiang county.There is proluvial remained mass?distributes in the toe of the Exi ditch and at the bank of Yalongjiang river in east county.Paper base on space form,material composition and structure change of the proluvia to reconstruction the great ancient flood flow happened in the last glacial.According to the composition and structural Characteristics of proluvial,reasonable selection middle to maximum numerical during test parameters and using geo-slope automatic search dangerous sliding surface and graphic method of Wang Yuemin to prediction the range of bank caving after Yagen water storage,the result show that when water Level is 2 602 meters,the width of bank caving is 28 meter,only enlarge 8 meters compare with water Level is 2 602 meters,which the width of bank caving is 20 meters.The rearch will directly be used in safety evaluation of Yajiang county、delineation of relocation range and selections of Yagen pool level between 2 602 mertes and 2 587 meters,and also has important significance to evaluate the environment geological conditions of Yajiang county.更多还原