Based on the theorem of soil plasticity and limit analysis together with three dimensional failure modes of soil mass under active and passive states,this paper details reasonable values of active soil pressure and passive soil pressure,and gives a design method of foundation pit supporting by I steel piles with lining planks.
以土的塑性极限分析理论为基础，根据土体主、被动状态下的三维破坏模式，探讨了工字钢桩前被动土压力的合理取值和作用在衬板上主动土压力的大小，提出了工字钢桩衬板支护的设计方法。