Abstract
Based on the distribution of the stone blocks in outwash deposits, the paper present a modeling method for the random structure of outwash deposits, in which the long axis of the stone blocks is supposed obeying a lognormal distribution. Then numerical experiments of biaxial compression using the granular discrete element method are used in the macro- and micro parametric analysis. The influences of strength of the cementation, the sizes of stone blocks, and the content of stone blocks on the peak compressive and shear strength are discussed. The micromechanical parameters of the outwash deposits are also analyzed. The proposed method offers a supplement to the mechanical characterization of outwash deposits and accounts for the limitation that indoor experiments cannot consider large stone blocks.
Highlights
Outwash deposits are a particular type of geological medium and are formed by glacial movement
Because large stone blocks cannot be used in the indoor experiments, the mechanical characterization of outwash deposits has some limitations
The results demonstrate that the stress-strain of this medium is approximately taken on nonlinear hardening characteristics, which agrees well with the hyperbola assumption of DuncanChang model, and the shear strength of the stone and debris mixture is related closely to the concentration and distribution of the stone blocks
Summary
Outwash deposits are a particular type of geological medium and are formed by glacial movement. They are widely distributed in southwestern China, where the water resources are rich and the geological conditions are suitable for the construction of hydropower plants. Others studied the relationships among the cementation of fine-grained debris, dry density, water content, block shapes, block distribution, and the shear strength of the stone and debris mixture by experimental tests, such as the large triaxial shear experiment, the medium-sized triaxial shear experiment, and the large horizontal push shear experiment [3,4,5,6,7]. The changes in the macroscopic compressive strength and shear strength of the medium are discussed
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