面板坝对坝址地质条件的适应性研究

Research on adaptability of CFRD to geological conditions of dam site

针对面板坝对坝址地质条件的适应性进行了研究,并指出面板坝趾板不是"受力结构",因此可以建于全强风化岩体、风化残积土以及砂砾石(河床深厚覆盖层)土质地基之上。趾板与地基的接触界面和某些陡立岸坡防渗帷幕外侧临空区,是面板坝地基防渗系统的最薄弱区,更是防渗系统的隐蔽工程,应予以充分重视。同时还指出,可灌性差的岩体是良好的防渗岩体,没有必要过分强调趾板地基岩体的可灌性。高地震烈度区面板坝是可以优先考虑的坝型之一。

The adaptability of CFRD to engineering geological conditions at dam site is researched.We have drawn some conclusions as follow： the toe slab of CFRD is not a ＂force structure＂,so it can be built on strongly weathered rock mass,weathered residual soil and sand-gravels（deep overburden of riverbed）.The contact interface between toe slab and foundation as well as the ＂free face＂ area outside the grout curtain of some steep slopes are not only the weakest areas but also the concealed works of the foundation impervious system of CFRD,which should be paid great attention to.The rock mass with poor grout-ability is believed to have good anti-seepage ability,so it is unnecessary to pay much emphasis on the grout-ability of foundation rock mass of toe slab.CFRD has top-priority when we choose a dam type in the high seismic intensity area.