土石坝与混凝土坝接头型式与抗震措施

Structure pattern and earthquake resistant constructional measure of inserted junction for composite dam

土石坝与混凝土坝的接头是坝体结构的薄弱部位,在地震作用下易出现相对沉降和张拉裂缝,进而引起集中渗透而导致坝体破坏。但采用理论计算或模型试验的方法研究接头应力与变形,其精度难以保证。总结了国内外混合坝接头的设计研究现状,认为接头的地震裂缝较难避免,应采取一定的抗震措施,如采用高塑性黏土、平接头连接形式以及加强反滤与排水设计等。

The inserted junction in the composite dam is the weak point of the dam structure, and the seismic safety of the inserted junction directly influences the safety of the whole project. But it is difficult to evaluate the seismic residual deformations through the theoretical analysis or scaled model test. In this paper, the structure pattern of the inserted junction has been discussed, and some earthquake resistant constructional measure was proposed, such as the clay with high plasticity index in the inserted junction, the plane junction between concrete dam and clay core, and to strength the filter zone and the drainage facility, etc.