The study reviewed existing theoretic backgrounds and conducted a comparative analysis on measurement data obtained from model tests, in order to examine the behavior of lateral flow by the plasticity of soils when unsymmetrical surcharge is worked on polluted soft soils with consistently increased leaching water from waste and dyes.
Model tests are carried out as follows: model bearing soil tank, bearing frame and bearing plate are made. By increasing unsymmetrical surcharge to the ground soils in the soil tank with the consistent water content and with gradually increased polluted materials at intervals and re-molding six types of samples, the amounts of settlement, lateral displacement and upheaval were respectively observed.
As a result, the amounts of settlement were found to occur from the boundary surface on the left toward the free end on the right, lateral displacement was enlarged down to the bottom, and upheaval occurred near free end on the right of the bearing frame toward the boundary surface on the right.
The value of ultimate capacity was expressed as qcr=5.29Cu-0.09, with the tendency within the equation suggested by Darragh and the one by Terzaghi, with the maximum value of qult = 9.73Cu-0.01, somewhat higher than the theory equation.
The vertical distribution of the maximum value of lateral flow pressure under the maximum load tended to be extended toward the depth and distributed near H/3 of layer thickness(H), and the maximum upheaval tended to occur from the free end on the right of the bearing frame toward near boundary surface on the right.
The lateral flow pressure is adequately calculated by and the trapezoid distribution pattern of the maximum value of lateral flow pressure on the soft ground is found to be distributed near H/3 of layer thickness(H), with a difference from composition pattern, Poulos distribution pattern and soft clay soils (CL, CH) which is not polluted.