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目前大量的深基坑开挖工程事故主要发生在沿江及沿海饱和淤泥土地区，其关键问题在于对淤泥土的被动土压力认识不足。针对这一问题，通过大量系统的室内模拟试验，对绕刚性墙板上端转动条件下墙后土体的破坏机理进行了研究。在绕刚性墙板上端转动的被动位移形式下，墙后饱和淤泥土体滑移线产生具有渐进性质，被动状态下的发展过程分为三个阶段，即：线性段；渐进破坏段；破坏发展段。同时试验还表明，淤泥土在被动状态发展过程中，土体所承受的被动荷载大小决定于淤泥的流动性质及墙体转动位移的大小。
At present, a large number of deep excavation engineering accidents mainly occur in saturated silt areas along the Yangtze River and coastal areas. The key issue is the lack of understanding of the passive earth pressure of silt. In response to this problem, through a large number of indoor simulation experiments, the failure mechanism of the soil behind the wall around the rigid wall is studied. In the form of passive displacement around the top of the rigid wall, the slip line of the saturated silt body behind the wall has a gradual nature. The development process in the passive state is divided into three stages, namely: a linear section, a progressive destruction section, and damage development. segment. At the same time, the experiment also shows that during the passive state development of silt, the size of the passive load that the soil body is subjected to is determined by the flow properties of the silt and the size of the wall rotation displacement.