Abstract
The migration behavior of trichloroethylene through porous media made of glass beads of 5, 3 and 1 mm dia is described. Experiments were carried out in three hydraulic conditions: (1) unsaturated (completely dry), (2) saturated and (3) two layers (the upper portion of the porous media being unsaturated and the lower portion being saturated). In the case of the dry condition (1) trichloroethylene easily flows through the porous media regardless of the size of the glass beads, while it remains in the pore space in the saturated medium in the saturated condition (2). The stagnation of test liquid in the saturated medium increases with decreasing glass bead diameter. With 5 mm glass beads, in the case of condition (3), all the liquid coming from the upper portion moved into the saturated zone, whereas with 3 and 1 mm glass beads, the liquid seemed to stagnate on the surface of the saturated zone. With 1 mm glass beads, especially, almost all the liquid remained stagnant in the boundary region between the unsaturated and the saturated zone. The difference of the trichloroethylene behavior in the capillary zone can be qualitatively explained from the results of the visualized testing by means of the Hele-Shaw model.
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