一、概述二江泄水闸是葛洲坝水利枢纽的主要泄洪建筑物。闸下游设一级平底消力池,池长180米。由于上游水库无调节库容,所以泄洪水量大、时间长,下游水位深,加之基岩软弱,这些对护坦的抗浮稳定和检修都很不利。为了护坦抗浮稳定,采用了13.5万平米的封闭防渗、排水系统,以降低扬压力;并削减护坦厚度。本文介绍这一封闭排水系统的设计和运行 I. Overview The Erjiang sluice is the main flood discharging structure of Gezhouba Dam. Gate downstream of a flat-bottom stilling pool, pool 180 meters long. Due to the unregulated reservoir capacity of upstream reservoirs, the discharge of floodwater is long and the downstream water level is deep. Combined with the weak bedrock, these are very unfavorable to the stabilization and maintenance of escort tank. In order to protect the tank anti-floating stability, the use of 135,000 square meters of closed seepage, drainage systems to reduce the Yang pressure; and cut the shield thickness. This article describes the design and operation of this enclosed drainage system