Disintegration of natural granite residual soil and the geohazard implication
Disintegration of natural granite residual soil and the geohazard implication
Collapsing gully as an erosional landform with a high sediment transfer rate is causing various hazards. Although it is widely acknowledged that the granite residual soil (GRS), especially its disintegration, plays a critical role, the quantitative characterizations of its disintegration behavior and the underlying mechanism remain to be revealed. In this study, laboratory disintegration tests were performed using a self-developed apparatus on natural GRS collected at various depths. The disintegration process was quantitatively traced through two types of parameters, namely disintegration ratio and disintegration rates. The disintegration behavior of natural GRS is classified accordingly. It is revealed that soil disintegration was triggered by cementation damage upon soaking which broke up the soil aggregates and reduced soil stability. In addition, previous studies overestimated the effect of particle composition on the disintegration of soil. This study provides quantitative characterizations of the disintegration behavior of GRS.
X. Y. Liu; X. W. Zhang; G. Wang; Y. Miao; H. D. Gao
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
B - Geohazards
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