堤基渗流管涌发展的理论分析

Theoretical analysis on piping development of levee foundation

本文在渗流理论基础上,推导出了管涌孔口附近的涌砂范围及继续向上游冲蚀发展距离的计算公式,所提出的管涌冲蚀向上游发展的计算方法,可用来鉴别管涌的危害程度。计算结果与模型试验及管涌的实际调研资料比较接近。文中还用三维有限元数值计算方法验证了本文推导的水头分布及渗流坡降公式的可靠性,并论证了直接引用源汇点理论计算管涌附近水头分布的不适应性。

Based on seepage theory and model test data, the formulas for calculating the range of sand spring around the piping exit and the possible distance for successive developing erosion towards upstream are proposed.The validity of the formulas is verified by FEM computation result.By using this method the harmfulness of the seepage piping can be determined.