洞庭湖区堤内压盖模型渗流有限元优化

Optimization of model of covering soil layer inside levee for Dongting Lake region by seepage FEM

根据洞庭湖区堤基地质特点,建立了多元结构堤基的堤内压盖模型,并采用渗流有限元法,通过改变堤内压盖宽度或厚度,进行优化研究.提出堤内压盖的临界宽度、厚度概念,并将有限元计算的临界宽度、厚度与堤防设计规范中压盖公式计算的结果进行对比,两者一致,说明有限元法处理压盖问题正确可行.最后,将有限元法应用到洞庭湖区资江大堤柴山湖段压盖处理工程中,结果表明,该方法对于求解实际复杂工程问题实用有效.

According to the characteristics of geology of the levee foundation in Dongting Lake region, covering soil layer model in multi-structure levee foundation has been established; through changing the width or thickness of covering soil layer, optimization study is carried out by seepage FEM. The con- cepts of optimization of width and thickness of the covering soil layer inside levee are put forward; and then the results of FEM and the covering soil layer formula in Code for Design of Levee are compared. The comparison shows that the both are coincident; and FEM is an effective tool to solve the covering soil layer problem. Finally, FEM is applied to Chaishanhu section of the Zijiang River levee; and it is shown that FEM is practical and effective for the real complicated projects.