基于比例边界有限元理论，推导了综合考虑库水可压缩性和库底边界吸收的坝面动水压力方程，提出了一种新的求解坝面动水压力的半解析方法，并通过算例验证了这种方法的精度和效率。结果表明，与传统方法相比，这种方法具有精度高、计算工作量小的优点。

Based on the Scaled Boundary Finite Element Method (SBFEM), an equation for calculating hydrodynamic pressure on dams was derived, which can consider the effects of compressibility of water and reservoir bottom absorption. A new semi-analytical method for calculating hydrodynamic pressure was proposed. Numerical examples of two-dimensional gravity dam have been provided. It is shown that this approach is superior to conventional methods in computational efforts and accuracy.