三峡工程运用后上荆江典型河段岸坡稳定性分析

Analysis of bank slope stability of typical reaches of upper Jingjiang River after operation of Three Gorges Project

根据三峡水库蓄水前后的实测地形和水文资料,分析了上荆江河段的水沙变化特性和该河段平滩河槽下的冲刷情况。结合三峡工程后续岸坡影响处理的工程实践,选择杨家垴至罗家潭段、学堂洲段、沙市城区、公安河弯、耀新民堤段、郝穴河弯段和南五洲等河段,进行了三峡水库蓄水运用后的岸坡稳定性分析。结合已有的预测结果及岸坡稳定的分析,指出上荆江河段岸坡存在崩塌隐患的地段。

According to topographical and hydrological data measured before and after the impoundment of Three Gorges Reservoir,we analyze the flow and sediment characteristics of upper Jingjiang River and the scour situation of the channel under bankfull water level. Combined with engineering practice for controlling impact of TGP on bank slope control,the analysis of bank slope stability is conducted for typical reaches,such as the Yangjianao to Luojiatan reach,Xuetangzhou reach,Shashi urban district reach,Gong＇an bend,Yaoxinmindi dike,Haoxue bend and Nanwuzhou reach etc.. Based on the previous prediction results and the slope stability analysis,it is suggested that the bank of upper Jingjiang reach have the collapse risk and needs to be protected.