三峡大坝左导墙长度优化设计

Optimization of the length of left training wall at TGP

左导墙位于泄洪坝段与左厂房坝段之间的导墙坝段下游。其作用是将河床中部的泄洪消能水流与左电厂尾水渠隔开 ,避免泄洪时高速紊动水流与左电厂尾水出流的相互干扰和不利影响。经对泄洪建筑物体型优化后 ,减轻了坝下冲刷 ,有利于消能防冲 ;消能后水流对左电厂尾水渠的影响也相应减轻 ,使左电厂尾水渠流态有明显改善。这说明存在可适当缩短左导墙长度的可能性 ,经试验研究 ,缩短左导墙长度 52m。

The left training wall of TGP is situated downstream of the transition dam section between spillway and left intake dam.It separates the spillway released energy dissipated water flow from the tailwater channel of left power plant to avoid the interference of high speed turbulent flow with tail water flow from left power plant,mitigating unfavorable influence.The optimization of flood releasing structure pattern will reduce scour below dam and favour water energy dissipation and scour prevention.The influence of energy dissipated water on tailwater channel is also reduced,so the flow pattern in tail water channel is improved obviously.It demonstrates that the possibility to suitably shorten the length of left training wall exists.It is finally shortened by 52 m after test and study.