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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。
In order to study the failure process of soil slope and further explore the mechanism of landslide, a soil slope centrifugal model test and measurement technique was developed to observe the deformation process of soil slope under loading condition. Centrifuge model test of soil slope under gravity load was carried out, the failure process of soil slope was observed, and the change of displacement field of soil slope was measured. The results show that the newly developed experimental test technology can better measure the deformation of soil slope during the centrifugal test. Under the condition of self-weight loading, the failure process of soil slope is more complicated. Crack cracks and sliding surface have been appeared one after another, which can be divided into three stages of relatively uniform deformation stage, strain localization stage and post-damage stage. Among them, the strain localization and the destruction process are closely related, and the failure of soil slope may be the result of many kinds of strain localization.