mlopezb@ulima.edu.pe

This study presents a methodology that includes hydraulic and mechanical constitutive relationships for modeling the complex volumetric behavior of unsaturated soils. The mechanical relationships are based on the generalized effective stress concept, and the hydraulic relationships adopt soil water retention curves dependent on soil deformation. After the formulation and the introduction of the governing equations, a study case based on the results of suction-controlled oedometric tests is presented, aiming for a better understanding of the effect of compaction on unsaturated soils. The oedometric compression curves of a first set of laboratory tests are reinterpreted in terms of the generalized effective stress concept to obtain the required model parameters. Then, numerical simulations are performed to analyze the soil susceptibility to large volumetric strains triggered by a combined ...

Studies concerning the debris flows in mountain areas are relevant because of their potential negative effects on the human communities and infrastructure in their areas of influence. To advance the understanding of the theoretical basis, this study qualitatively analyzes the effect of lithological characteristics and soil type on the generation of debris flows in the arid basin of Mirave, in southern Peru, as a consequence of extensive rainfall. Two debris flow events are evaluated, which occurred in the studied area in March 2015 and February 2019. The method used to achieve the objective combines the use of satellite images, field data collection, and lab tests results to estimate the relative importance of the abovementioned characteristics in the generation of debris flows. The results suggest that the poor presence of clay and the predominance of sandy-loamy structured soils in the...

aalmeida@ulima.edu.pe; mlopezb@ulima.edu.pe; lcaceres@ulima.edu.pe