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膜袋砂围堰对地基的作用是一种典型的柔性荷载,该荷载作用下的软土地基的破坏模式及潜在滑裂面与刚性基础荷载有所不同。针对这一问题,设计并完成了一组室内模型试验,模拟膜袋砂围堰的填筑过程,观测获得了围堰填筑过程中和加载完成后软土地基的变形形态。基于模型试验得到的软土地基位移矢量和裂缝形态,参考传统地基承载力理论,提出了一种新的地基破坏分区方法,并用数值模拟方法分析了该破坏分区的合理性。新的分区方法主要改变了软土地基破坏时主动区和过渡区的划分,对于软土地基破坏分区是一种新的认识。
The effect of membrane bag sand cofferdam on the foundation is a typical flexible load. The failure mode of the soft soil foundation under this load and the potential slip surface are different from the rigid foundation load. In response to this problem, a series of indoor model tests were designed and completed to simulate the filling process of the membrane bagged cofferdam. The deformation of the soft soil foundation during and after loading of the cofferdam was observed. Based on the model test of soft soil foundation displacement vector and fracture morphology, a new method of subgrade failure was proposed by referring to the traditional bearing capacity theory. The rationality of the failure subarea was analyzed by numerical simulation. The new zoning method mainly changes the division of active area and transitional area in the destruction of soft soil foundation, which is a new understanding for the destruction of soft soil foundation.