Geomaterial Characterization and Stability Assessment of Hydraulic Fill Dams

Abstract

In this research study, the stability of a hydraulic fill dam located in a newly declared seismically hazardous zone in north Texas was evaluated, incorporating the effect of geomaterial variability existing in the dam. Hydraulic fill dams exhibit highly variable geomaterial conditions due to the method of construction and are prone to stability issues during earthquakes. Hence, a comprehensive study was needed to account for such variations in geomaterial properties and assess the stability of the dam rather than performing routine analysis using representative geomaterial properties for the shell, core, and foundation of the dam. Cone penetration tests were performed on the dam to study geomaterial properties and their variabilities. These results were used to develop three-dimensional (3D) visualization models using kriging analysis. The geomaterial properties obtained from the visualization models were subsequently used in the slope stability analyses. The developed visualization models depicted the variation of geomaterial properties within the dam. The use of the visualization models has led to the development of an innovative approach for performing stability analyses of earthen dams with high geomaterial variability.