23 - ANÁLISE GEOTÉCNICA E SOLUÇÕES DE ESTABILIZAÇÃO PARA TALUDE COM RUPTURA CIRCULAR NA RUA ARISTIDES BERTUOL, BENTO GONÇALVES/RS

Doi: 10.47094/COBRAMSEG2026.4/23

PALAVRAS CHAVE: Estabilidade de Taludes, Ruptura Rotacional, Saturação, Muros de Ga-bião, Equilíbrio Limite.

KEYWORDS: Slope Stability, Rotational Failure, Limit Equilibrium Method, Gabion Retaining Walls, Drainage.

ABSTRACT:
This paper presents the geotechnical investigation, limit equilibrium modeling, and sta-bilization design of an urban slope that experienced a rotational failure during regrading works in Bento Gon-çalves, southern Brazil. The slope mass consists of clayey colluvial soil and a saprolitic horizon overlying weathered and fractured volcanic rock. The investigation comprised topographic survey, geological-geote-chnical mapping, drilling, direct shear tests, and stability modeling using SLIDE2 software. Average shear strength parameters obtained for the colluvial soil were c' = 28.3 kPa, ?' = 18.2°, and ? = 14 kN/m³. Under natural conditions, the stability analyses yielded safety factors between 2.4 and 3.6. Under the no-cohesion condition, the automatic search generated shallow and localized slip surfaces with low safety factors, which were interpreted as superficial instability mechanisms rather than as the global failure observed in the field. The assessment of the global mechanism was related to the real failure surface interpreted from the mapped scarp and the geological-geotechnical profile. The proposed stabilization combines gabion retaining walls in the failed zone, regrading, retaining structures, and drainage measures in adjacent sectors, reducing pore pres-sure effects and increasing overall slope safety.

Autores

• Adriely Scheffer Arboite

• Lucas Rafael Norenberg Barbosa