Laboratory Dissolution Experiments of Internal Erosion in Sandy Soil: Underground Cavities and Piping
Loss of soil particles due to mineral dissolution, degradation or internal erosion can lead to a change in the microstructure of soil, which as a result, affects the strength and stiffness of soil. This paper presented an approach to investigate the behavior of granular soil subjected to local particle removal by introducing a certain amount of erodible particles. Through sufficiently long period of water flushing, internal erosion was simulated by dissolution of glucose shaped in block/pipe, in representing underground cavities and piping. A series of model tests were conducted, and the formation of cavity/piping was recorded by digital images from the front of the soil chamber. Extent of loosening during the propagation of erosion and changes in local strength at post-erosion state were obtained by conducting penetration tests.
KeywordsInternal erosion Dissolution Particle loss Cavity Penetration test
The authors acknowledge the final support from the National Natural Science Foundation of China under Grant No. 51609171. Experiments presented in this paper were performed in the Department of Civil Engineering at the University of Tokyo.
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