三峡永久船闸混凝土边墙极端不利外水压力分析

ANALYSIS ON THE EXTREME UNFAVORABLE EXTERNAL WATER PRESSURE ON PERMANENT SHIPLOCK SIDE WALLS OF THREE GORGES PROJECT

三峡永久船闸采用直立岩坡贴壁式薄衬砌边墙，墙后外水压力是边墙稳定的重要荷载。船闸闸室水位变动频繁，当闸室水位突降，由室内渗出的外水即构成作用在边墙上的外水压力。考虑了墙内排水体系的作用，对非恒定渗流问题进行了多工况分析，给出极端最大外水压力值。

The thin concrete lining on vertical rock slope is adopted as the sidewalls of permanent shiplock of Three Gorges Project. The external water pressure acting on lining is an important load for stability of the side walls. Water level in shiplock is always fluctuated. The external water pressure is induced by water seepage into rock mass while water level in shiplock is sharply dropping down. The extreme un favorable seepage water pressure is given by unsteady seepage analysis in consideration of drainage system behind the sidewalls.