高拱坝表孔以上结构受力分析和施工方案探讨——以构皮滩拱坝为例

Discussion on stress analysis and construction scheme for the surface outlet structure of high arch dam,a case study of Goupitan arch dam

表孔一般是高拱坝泄洪的主要通道,具有孔口数量多、结构尺寸大、受力状态复杂的特点。它对坝体结构削弱较大,顶部一般设连接大梁以提高大坝上部结构的整体性,而孔道常采用跨横缝布置,孔道两侧闸墩难以同步上升,连接大梁施工难度大。本文以构皮滩拱坝为例,对高拱坝表孔以上结构受力分析和施工方案进行探讨,可供同类工程参考。

Surface outlet is the main discharge channel of high arch dam.Usually many surface outlets of large size are constructed on a high arch dam;their stress conditions are quite complicated.These outlets reduce the strength of dam body considerably,and a connect beam is often employed to enhance the integrity of upper structure of the dam.Surface outlet bestrides the transverse joint,but the construction of two side piers is not in phase,and the construction of connect beams is also difficult.This paper discusses the methods of stress analysis and the construction scheme of the surface outlet structure through a case study of Goupitan arch dam.