大泄量、窄河谷、深覆盖层闸坝设计研究

Study on Design of Gate Dam with Large Discharge, Narrow Valley andDeep Overburden

在我国西南山区的大江大河上,因泄流量大、河谷狭窄等特点,干流上的水电站多以高坝大库为主,少有低闸坝径流式或引水式电站,而其中建基于深厚覆盖层上的闸坝更是少见。以雅砻江锦屏二级水电站拦河闸坝为例,论述在窄河谷、深厚覆盖层上兴建满足大泄量要求的闸坝设计要点,包括闸室结构设计、坝基防渗和基础加固等,重点研究闸坝下游的消能防冲运行安全,并结合电站实际运行情况进行安全评价。

On the large rivers in the mountainous areas of Southwest China,due to the characteristics of large discharge and narrow valleys,most of the hydropower stations on the main stream are high dams and large reservoirs.Only a few of them are runoff or diversion power stations with low gate dam,and the gate dam built on the deep overburden is rare.Taking the gate dam of Jinping II Hydropower Station on Yalong River as an example,this paper discusses the design key points of gate dam which built on deep overburden in narrow valley to meet the requirements of large discharge,including the design of gate chamber structure,foundation seepage prevention and foundation reinforcement,etc.It focuses on the safety of energy dissipation and scour prevention downstream the dam,and combines with the actual operation of the power station,the operation safety assessment is done.