基于宏—细观模型的石漫滩水库重力坝开裂机理研究

Study on Cracking Mechanism of Gravity Dam Based on Macro-Micro Model

为了弄清石漫滩水库混凝土重力坝坝体运行期裂缝形成机理,采用APDL语言中的ESEL命令并配合局部坐标系的旋转来完成随机骨料的投放方法,构建了石漫滩大坝^(#)9非溢流坝段的三维宏-细观有限元模型,通过模拟计算,分析了运行期大坝的裂缝成因。结果表明,该方法可快速生成三维球形及多面体形骨料,大大提高了骨料的生成效率;采用宏-细观模型计算的结果与大坝的实际裂纹分布情况更为符合,周期性的冬季快速温降及夏季快速温升对运行期混凝土坝开裂的影响不容忽视。

In order to understand the mechanism of crack formation in the RCC gravity dam body during operation,this paper takes the Shimantan reservoir dam as the research object,adopts a method of using the ESEL command in APDL language and the rotation of local coordinate system to complete the random aggregate delivery,and constructs a three-dimensional macro-micro finite element model of the No.9 non-overflow dam section of the Shimantan dam.The simulation results of aggregate placement show that the method can quickly generate three-dimensional spherical and polyhedral aggregates,greatly improving the efficiency of aggregate generation.The results calculated by the macro-micro model are more consistent with the actual crack distribution of the dam,and the impact of the rapid rise in summer temperature and rapid drop in winter temperature on the cracking of concrete dams during operation cannot be ignored.