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Geotechnical Characterization of a Heterogeneous Unsuitable Stockpile

Author: K. Rengifo, F. Herrera, L. de la Cruz
Conference: 5th International Conference on Geotechnical and Geophysical Site Characterisation
Date: September 5-9, 2016

ABSTRACT
Typically, stockpiled unsuitable soils from construction activities are classified as saturated soft fine soils. Nevertheless, because of some projects particularities, unsuitable materials could also present coarse soils resulting in a heterogeneous stockpile. This paper presents the geotechnical characterization of a heterogeneous stockpile in Peru in order to verify the physical stability of the disposal pile and to optimize the closure configuration. This characterization was based on a geotechnical investigation campaign that included boreholes, test pits, CPTU, MASW, field and laboratory tests. Based on the analysis of that information, strength parameters were determined for slope stability analysis. These parameters were represented by undrained shear strength lineal profile variable in depth for fine soils, and constant values of friction angle and cohesion for coarse soils. The stockpile stratigraphy was defined through the compatibility of geotechnical investigations results such as NSPT blow counts, shear wave velocity (Vs), soil behavior type index (Ic), laboratory results, etc.

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