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| Experimental study on internal erosion of dyed sands under cyclic loading |
| DAI Shaoheng，ZHANG Sheng，TONG Chenxi，LU Jing，GAO Feng |
| (Department of Geotechnical Engineering，Central South University，Changsha，Hunan 410075，China) |
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Abstract Internal erosion is a major cause of failures of many infrastructures such as dikes，embankments and dams. At present，studies on internal erosion of sands fail to consider the influence of cyclic loading and cannot describe the migration of fine particles quantitatively. To this end，a series of cyclic loading-controlled seepage tests were conducted on two dyed sands with different particle size distributions to explore the hydraulic response mechanism during internal erosion，and to describe the particle size distribution and the detailed amount of the lost particles after the tests. The results show that with the coupling effect of cyclic loading and ascending water head，specimen A，evaluated to be stable by soil stability assessment methods in the literature，presents a certain amount of particle loss and then reaches a new equilibrium state，while specimen B assessed to be unstable continues to lose fine particles accompanied by the permeability coefficient increasing. It is also indicated that the average particle size of the migrated particles tends to be greater and the depth of the migrated particles tends to be larger with increasing the hydraulic gradient. Under the coupling action of the cyclic loading and the water head，the pore water pressure in sand specimens fluctuates，forming an oscillating hydraulic gradient and therefore affecting the internal stability of the soil samples. The research results deepen the understanding of the internal erosion characteristics of sands and provide theoretical and experimental support for studing the development mechanism of related diseases.
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2022, Vol. 41 
