ABSTRACT

Displacements are measured for assessing the stability of a cut slope that appeared in the construction of a newly developed golf course. Global Positioning System (GPS) is used for measuring displacements. In order to assess the stability of slopes during constructions, displacement measurements are commonly performed, followed by back analysis of the measured displacements to determine strength parameters such as cohesion and internal friction angle of geomaterials. Once the strength parameters are determined, the factor of safety can be calculated by a conventional limit equilibrium method. In fact, GPS displacement measurements were continued for monitoring the slope stability after changing the slope angle. In fact, the slope failed on the day after taking the displacement data that were used for the back analyses. This implies that the proposed back analysis procedure can determine the factor of safety with sufficient accuracy only from surface displacements measured by GPS.