（1）安全可靠；
（2）经济合理；
（3）便利施工。
2、基坑支护结构的设计方法：
（1）承载能力极限状态；
（2）正常使用极限状态。
基坑支护结构均应进行承载能力极限状态的计算；对于安全等级为一级、支护结构变形有限制的二级建筑基坑侧壁，尚应对基坑周边环境及支护结构变形进行验算。
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