高面板堆石坝变形控制的若干问题

目前面板堆石坝的高度已从100m级发展到200m级，由于分期施工，高面板堆石坝的坝体变形性状更加复杂。本文以250m典型高面板坝为例，采用清华非线性K-G模型，分析了高面板坝的一些特殊变形问题，提出：优化施工临时剖面，以防止坝体在施工期出现过大的差异变形而产生裂缝；分期面板的浇筑高程要与堆石体的顶部保持一定的高差，以防止面板与支承堆石体间出现脱空；对高坝、特别是峡谷地区的高面板坝，要注意减少面板的法向变形，以控制坝肩附近周边缝和垂直缝的三向变形。

Discussion on deformation control of high CFRD

A typical CFRD,250m in height, is analyzed as an example to study the possible special deformation problems happened to high CFRD. The K-G model developed by Tsinghua University is applied. It is concluded that :1) to prevent from cracking due to excess difference of deformation, the temporary cross section of the dam in different stages of construction should be optimized; 2) a certain elevation difference between the top of rockfill and top of concrete face plate must always be kept in the process of construction, to avoid from the occurrence of void between the embankment and face plates; 3) attention must be paid to the control of the normal direction defromation of face plates so that the 3-D deformations of the peripheral joints and adjacent vertical joints can be controlled.