| Deep mixing method is often implemented to make solid foundation for retaining wall on soft ground. When the ground is composed of loose sand deposit, lateral displacement of the retaining wall due to liquefaction of the sand deposit is a concern. Lateral displacement is an index to represent limit state of retaining wall. But, rational design method to decide height and width of deep mixing based on lateral displacement doesn’t exist. Therefore, this paper describes a practical prediction method for lateral displacement of the retaining wall. A practical calculation method for displacement of the remedied zone was applied. In the method, a macroscopic failure envelope and a plastic displacement potential in the general load space are considered to evaluate the subgrade reaction forces on the base of the remedied zone. A series of centrifuge model test on retaining wall underlain by loose saturated sand with remedied zone was performed. Size of remedied zone, height of retaining wall and input motion are varied in the model tests. Forces applying to the remedied zone were measured by some load cells installed in blocks representing the remedied zones As a result, it was confirmed that the method could simulate some trends obtained by the model tests, which was improved to expand the failure envelope according to the residual displacement. |
