论深基坑支护的空间效应

Research about spatial effect of deep pit supporting

深基坑是一个复杂的三维空间问题。本文借助于坑壁土体的三维破坏模式，基于土的塑性上限理论及极限平衡分析理论，探讨了两坑壁端部对坑壁支护结构上土压力的整体屏蔽作用，提出了考虑空间效应的土压力计算公式。该计算公式可用于基坑护坡桩、地下连续墙等支护系统的设计。

Deep pit is a complex three dimension spatial problem. Based on soil plasticity upper bound theory and limit equilibrium analysis theory, the paper discusses excavation ends shielding effect from soil pressure acted on supporting structure, and gives out soil pressure calculating formula combined with spatial effect. The formula can be used for pit supporting system design such as retaining pile, diaphragm wall and et al.