Study on the strength and deformation characteristics of loess under multi-staged unloading

Yingpeng Fu, L. Yao, H. Liao, L. Lv, Yun-yan Tan
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Abstract

The strength and deformation characteristics of loess under vertical unloading path is important for the study of slope instability in excavation area. From the perspective of engineering application, direct shear test is carried out. Moreover, a discrete element method model is established to study micro-mechanism of multi-stage unloading. It is found that the shear displacement-shear stress curve of the soil under the multi-stage unloading path is different from those under the loading state. The soil sample is prone to shear failure during small deformation under multi-stage unloading. The shear strength is related to the initial consolidation pressure and unloading ratio. During the multi-staged unloading process, the number of contacts between particles does not change significantly, while the contact forces between particles decrease obviously.
黄土多级卸荷强度及变形特性研究
竖向卸荷路径下黄土的强度和变形特征对研究开挖区边坡失稳具有重要意义。从工程应用的角度出发,进行了直剪试验。建立了离散元法模型,研究了多级卸载的微观机理。研究发现,多级卸载路径下土体的剪切位移-剪应力曲线与加载状态下不同。在多级卸载条件下,土样在小变形时容易发生剪切破坏。抗剪强度与初始固结压力和卸载比有关。在多级卸载过程中,颗粒之间的接触次数变化不大,颗粒之间的接触力明显减小。
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