Estudio de las envolventes consolidada-drenada mediante ensayo de corte directo para el análisis de estabilidad de las presas de tierra del Proyecto Pacalor

Abstract

This study delivers the results obtained from the slow consolidated-drained tests, using direct cutting equipment on samples of compacted and saturated soils, setting up the curtain of the Chojampe 2 dam soil as part of the PACALORI project. For the making of the direct cutting slow tested samples, we analyzed the way in which they have to be compacted in field, considering that they are fine soils with an elevated water content (moisture) in natural conditions and will be compacted using low compaction energy, similar to the Standard Proctor test. Taking account the bankruptcies of the direct shear tests, being the most important the one which forces the sample to fail by a fixed plane, the results are compared with those obtained in "unaltered" and previously saturated soil samples to which have been determined the consolidated-drained (slow) envelope, by means of the triaxial test consolidated-undrained, with measurement of the pores pressure. Based on the results of the consolidated-drained envelopes obtained in both the direct cut and triaxial equipment, that are very similar due to their thin soils (MH) origin with high saturation, we pose recommendations about the use of these strength parameters for the analysis of slope stability in effective stresses, needed in the load tests to which will be submitted the Chojampe 2 dam along its useful lifetime.