土坡破坏过程的离心模型试验研究

为了研究土坡的破坏过程并进一步探讨滑坡的机理,开发了土坡离心模型试验和测量技术以观测加载条件下土坡的变形过程。进行了自重加载情况下的土坡离心模型试验,观察了土坡的破坏过程并测量了土坡的位移场变化。结果表明,新开发的试验测试技术能够较好地测量离心试验过程中土坡的变形。自重加载条件下土坡的破坏过程较为复杂,先后出现了拉裂缝和滑裂面,可以分为相对均匀变形阶段、应变局部化阶段和破坏后阶段等3个阶段。其中应变局部化与破坏过程关系密切,土坡的破坏可能是多种应变局部化的结果。

Centrifuge modeling of failures of cohesive soil slopes

A test system was developed to study failures in soil slopes using a centrifuge to vary the forces on the slopes. A series of centrifuge tests of cohesive soil slopes were conducted to measure the deformations and to analyze the failure process. The failure process is a complex combination of tension cracks and sliding surfaces due to the self-weight loading. The failure process can be divided into three stages, including homogeneous deformation, strain localization, and post-failure. Slope failure can be induced by several types of strain localization.