【摘要】 采用三维非线性有限元法建立纳子峡水电站面板砂砾石坝的三维有限元分析模型,对大坝填筑施工过程和水库蓄水过程进行仿真研究,计算分析施工期和蓄水期大坝、面板及周边缝的变形特性。计算结果表明:施工期和蓄水期坝体的最大沉降分别为0.74 m和0.76 m,占最大坝高的0.61%和0.63%;第一主应力最大值分别为2 321 kPa和2 478 kPa,第三主应力最大值分别为588 kPa和626 kPa,应力水平在0.3～0.85之间;周边缝和面板缝法向拉伸变形最大值分别为29 mm和34 mm,垂直剪切变形最大值分别为25 mm和0,顺缝剪切变形分别为27 mm和29mm。从静力分析结果看,纳子峡面板坝的设计方案是合理的。更多还原

【Abstract】 The filling process of the concrete-facing sand-gravel dam and the storage process of the reservoir for Nazixia Hydropower Station are simulated by 3-D nonlinear EFM,and the deformations of dam,face slab and peripheral joint in construction and storage periods are calculated respectively.The results show that,(i) the maximum dam settlements in construction and storage periods are 0.74 m and 0.76 m respectively,which accounts for 0.61% and 0.63% of the dam height;(ii) the maximum first principle stresses are 2.321 MPa and 2.478 MPa respectively,the maximum third principal stresses are 0.588 MPa and 0.626 MPa respectively,and the stress level is 0.3 to 0.85;(iii) the maximum normal tensile deformations of the peripheral joint and slab joint are 29 mm and 34 mm respectively,the maximum vertical shear deformations are 25 mm and 0 respectively,and the shear deformations along joint are 27 mm and 29 mm respectively.The static analysis shows that the dam design is reasonable.更多还原