GIS-BASED KINEMATIC SLOPE STABILITY ANALYSIS

Kinematic slope stability analysis can be used to evaluate the potential for plane or dip-slope failure, which is sliding along a bedrock discontinuity plane (such as bedding), and wedge failure, which is sliding along an intersection line of two intersecting discontinuity planes (such as bedding and a fault). The geometric relationship between the orientation of the discontinuity planes and the orientation of the overlying topography determine the kinematic stability of a slope. We apply a GIS-based kinematic model to address slope stability for a canyon landfill in southern California. Geologic data (bedding, joints, faults, shears, etc.) are compiled into the GIS to create a representative model of the geologic structure across the study area. Spatial analysis of the geologic model and the topographic model determine kinematic slope stability and identify areas of potential plane failure or wedge failure. This study demonstrates the feasibility and usefulness of performing kinematic slope stability analysis within the GIS framework. The study also demonstrates that GIS-based kinematic analysis is superior to traditional application of kinematic analysis in that GIS-based analysis provides: (1) greater accuracy of results, (2) increased efficiency of analysis, and (3) better communication of findings.