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以巴山水电站填筑及运行期的原型观测资料为依据,反演分析了坝体堆石料的非线性邓肯E-B模型参数,用观测资料验证了参数的合理性;以反演参数为依据,采用三维黏弹性有限元仿真计算了坝体开始填筑至经历7.10洪水后面板的应力变形情况,计算分析了面板连接缝变形和面板脱空、垫层料亏坡情况,分析了三期面板局部挤压破坏和裂缝的原因。分析表明:浇筑面板时堆石体沉降未收敛和初次蓄水时涨水过快是三期面板局部挤压破坏和裂缝的主要原因;经历洪水后连接板附近未出现拉应力区域,面板垂直缝及周边缝变形较小,三期面板顶部出现了轻微的脱空;面板折线处与周围变形协调性好,没有出现应力变形突变现象,设置连接板改善了面板的变形及受力状态,效果良好。
Taking non-linear Duncan EB model parameters of dam rockfill material as an example, the rationality of the parameters is verified by observing the prototype observation data of filling and operation of Bashan Hydropower Station. Based on the inversion parameters, The viscoelastic finite element simulation is carried out to calculate the stress and deformation of the dam after it has started to fill up to 7.10 floods. The deformation of panel joint, the void of the panel and the deficit of the cushion are calculated and analyzed. Causes of damage and cracks. The analysis shows that the main reason of local crushing failure and cracks in the third period is that the settlement of the rockfill body is not converged and the water flow is too fast when the water is poured for the first time. The tensile stress zone does not appear near the connecting plate after the flood and the panel vertical seam And the peripheral seam deformation is small, and the top of the third panel appears a slight void; the panel fold line has good coordination with the surrounding deformation and no sudden deformation of the stress occurs; the connection plate is provided to improve the deformation and stress state of the panel, and the effect is good .