面板堆石坝面板脱空现象成因分析及预防措施

利用三维有限元分析方法对影响面板脱空现象的各种因素进行了计算分析,并对在分期浇筑面板的高程、堆石体的材料及变形特性、垫层料的材料及变形特性以及不同的蓄水情况等因素影响下的脱空值及其规律进行了系统的比较分析.结果表明,低压缩性、高抗剪强度的垫层料和砾石材料变形较小,通过控制填筑高度及施工顺序、提高碾压质量等措施,可防止或减少面板脱空现象.

Causes of formation of interspace between slab and cushion layer of CFRD and measures for its prevention

The 3-D FEM was used for analysis of the factors causing interspace between slab and cushion layer,with emphasis on the size of interspace and the regularity of its variation under the influences of the elevation of stage slab pouring,the materials of rockfill and cushion layer and their deformation characteristics,and the different water storage conditions. The result shows that the materials of rockfill and cushion layer with low compressibility and high shear strength are of small deformation.Finally,it is pointed out that interspace can be prevented by control of the height of pouring,adjustment of the construction order,and improvement of the quality of roller compaction.