象鼻岭拱坝水垫塘结构布置优化设计

Design Optimization of the Structure Arrangement of Plunge Pond for Xiangbiling Arch Dam

象鼻岭水电站具有洪水流量大、河谷狭窄、过流单宽流量大的特点,泄洪消能防冲成为工程运行中的关键问题,结合工程实际条件及同类工程的设计、施工及运行经验,在保证工程投资相当或略优的情况下,从运行调度、检修、下游岸坡稳定、出水水流顺畅等方面开展优化设计研究,最终将下游消能由可行性研究阶段的护坦+护坡调整为消力塘。最终的方案减少了对下游岸坡的高陡边坡开挖,有效保留了下游坝肩抗力体,有利于坝肩抗滑稳定,取消了护坡底部深槽施工,简化了施工程序,提高了施工安全性,降低了施工难度。

As large flood flow,narrow river valley and large unit-width discharge of Xiangbiling Hydropower Station,the flood discharge energy dissipation and anti-souring has become a key issue in project operation.Combined with the actual conditions of project and the design,construction and operation experience of similar projects,and in the case of ensuring that the project investment is equal or slightly reduction,the design optimization research is carried out from the aspects of operation scheduling,overhaul,downstream bank slope stability and smooth water discharge,and finally the energy dissipation mode is adjusted from the scheme of apron + bank protection in feasibility study stage to the scheme of plunge pond.The final scheme reduce the excavation of downstream high steep bank slope,effectively retain downstream abutment resistance body which is beneficial to the anti-sliding stability of abutment,eliminate the deep trough construction at the bottom of slope protection,simplify construction procedure,improve construction safety and reduce construction difficulty.