Slope stability bidimensional analysis in a geological fault zone in Chinchao, Huanuco, Peru

Abstract

Objective. Evaluate slope stability condition in a geological fault zone through the limit balance method of the progressive of the highway, km 37+700 al km 37+800 (national route PE+18A), of the populated center Pachachupan, Chinchao district, provin-ce and region Huanuco. Methods. Research quantitative ap-proach descriptive level naturalistic observation type basic and no experimental. The sample consisted of the most critical slope using a nonprobabilistic purposive sampling criterion. Results. The factor of safety for the static analysis was 0.381 and for the pseudo-static analysis 0.214. On the other hand, the geo-logical fault was found inactive, presenting as direct indicators: displacements of 5.5 cm in the fault plane; striations in the di-rection of the fault plane of 2 to 2.5 cm; fault breccias in eroded depressions of fine material and direct indicators; a morphology of steep area by erosive processes with view of fractures in the strata of the rock massif; vegetation consisting of shrubs and cultivated agricultural land; and absence of tributaries and torrents generated by groundwater. Conclusions. The slope stability condition for a static and pseudo-static analysis was unstable and the inactivity of the geologic fault does not represent a critical potential risk in the formation of external geodynamic phenomena (landslides, earth flows and debris flows).