Volume 31, Issue 2 (March 2008)
Physical Modeling of Landslide Stabilization Methods in an Overconsolidated Clay
This paper describes some of the main results of physical modeling tests performed on retaining structures. The modeling arose from the design of stabilizing structures for a landslide with a natural slope angle of 10°, a thickness of about 15 m, a 90 m wide and 600 m long extension, which occurred in overconsolidated clay. The medium plasticity inorganic clay soil was characterized by a shear resistance peak angle, φP′=24.7° and a residual angle φR′=10.5°. Two types of stabilizing structure models fixed into the subsoil, were adopted: the first, consisted of a diaphragm wall and the second of three aligned piers; both models were instrumented with strain gages. The sliding block was mechanically pushed against the structure up to failure, in order to assess the behavior of the structures in displacing ground. This paper presents details of the performed tests, the procedures that were adopted and an analysis of the gathered results according to “empirical-based” and “pressure-based” design methods.