复杂地形条件下高面板堆石坝的应力变形特性

Stress and deformation analysis of high CFRD under complicated topographic condition

运用三维非线性有限元法对某复杂地形条件下高面板堆石坝的应力变形进行预测,重点分析了高陡岸坡和起伏突变的地形边界对分期施工的高面板坝应力变形特性的影响.结果表明:高陡岸坡边界对大坝堆石体的应力变形影响不明显,但对面板应力变形和周边缝的变位影响较大,尤其是高陡斜坡时,对面板有明显的向河床方向的束窄作用,导致该处附近面板呈现较大拉应力区和周边缝基本都呈拉开状态;起伏突变的地形对大坝堆石体的应力变形很不利,应进行相应的技术处理.

The 3D non-hnear FEM was applied to prediction of the deformation andstress of a CFRD under complicated topographic condition with emphasis on analysis of the influences of high steep slope and fluctuant topographic boundary on the deformation and stress behaviors of CFRD by stage construction. The result shows that high steep slope is of little influence on the stress and deformation of rockfill of CFRD, while it is of great influences on stress and deformation of concrete slab and the deformation of peripheral joints. Especially, the high steep inclined slope makes concrete slab become narrow along riverbed, which leads to large tensile stress zone in concrete slab and open state of peripheral joints. It is also concluded that the fluctuant topographic condition is of negative effect on stress and deformation of rockfill, and some technical measures should be taken to overcome the disadvantages.