[提要]  使用弹性支点法，从综合考虑稳定、强度、变形的角度讨论了单支撑、双支撑-排桩基坑支护结构支护点的优化问题，通过两个实例分析，说明了单纯考虑桩身强度与稳定的不足，以及实际工程中考虑优化的重要意义和可行性。
[关键词]  深基坑  弹性支点法  支护点优化

The FEM of beams on elastic subgrade is applied to optimize the bracing points of single and double branch-piles deep foundation supporting technology, by which the stability, strength and deformation
can be considered synthetically. The limitation of evaluating the piles'  strength and stability is illustrated by two examples. The significance of optimal design of bracing structures for deep pit is given.
Keywords: deep foundation pit; FEM; beam; elastic subgrade; optimization; bracing points