2019 Volume 75 Issue 2 Pages I_181-I_186
One of the measures to prevent salt accumulation in semi-arid areas is the Capillary Barrier ground (hereinafter, CB ground) which is a soil layer structure composing of a sand layer over the gravel layer. Dry sand in semi-arid areas is difficult to hold the layer boundary surface long term because it is easy to be mixed in the gap between gravel particles due to the vibration at the time of construction. The CB ground was clarified that the dry sand was mixed into the gap of the crushed shell particles layer at the same time while retaining the function by using crushed shell particles as an alternative material for gravel materials. However, The CB ground was composed of crushed shell layer containing fine scallop shell particles has possible to decrease the function of increasing moisture because the water characteristic curves are different depending on the size of the shells. This study elucidated the CB ground composing of crushed shell particles layer containing fine particles has effect of the long-term capillary from observation in the laboratory experiment and was performed numerical analysis to clarify the water behavior in the specimen.
