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Mechanical consequences of internal soil erosion

机译：内部土壤侵蚀的机械后果

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Internal erosion sometimes occurs in dams and slopes. Under seepage, fine particles in soil may migrate through the pores formed by the coarse matrix. The mechanical properties of the soil may then change due to the loss of fine particles. Extensive laboratory tests are conducted in this research to study the shear strength of a dense, internally unstable soil subjected to the loss of fine particles. The soil exhibited strain-softening behaviour prior to internal erosion. Once a significant amount of fine particles was lost, the strain-softening behaviour of the soil would turn into strain hardening. The peak shear strength of the soil decreased slightly, but the shear strength at the critical state increased slightly in response to the loss of fine particles. The peak friction angle decreased by 1.1-5.9° after a loss of 2.5-6.8% of fine particles. Finally, based on the findings of the study, a probable mechanism of the formation of sinkholes and cavities in slopes and slope failures associated with internal erosion problems is presented.
机译：内部侵蚀有时发生在水坝和斜坡上。在渗流下，土壤中的细颗粒可能会迁移通过粗基质形成的孔。然后，土壤的机械性能可能由于细颗粒的损失而改变。在这项研究中进行了广泛的实验室测试，以研究遭受细小颗粒流失的致密，内部不稳定土壤的剪切强度。在内部侵蚀之前，土壤表现出应变软化行为。一旦大量细小颗粒丢失，土壤的应变软化行为将转变为应变硬化。土壤的峰值抗剪强度略有下降，但在临界状态下的抗剪强度由于细颗粒的损失而略有增加。在损失了2.5-6.8％的细颗粒之后，峰值摩擦角减小了1.1-5.9°。最后，根据研究结果，提出了在斜坡上形成井眼和孔洞以及与内部侵蚀问题相关的斜坡破坏的可能机制。

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