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• W4285451844 abstract "ABSTRACT. Geophysical methods have great applicability for investigations in geotechnical structures, complementing and filling information gaps associated with traditional instrumentation. The contribution of seismic methods has gained attention in recent years since the body wave velocity fields can be associated with elastic modules of geotechnical interest. In particular, S-wave velocity (Vs) correlates with the shear modulus, which significantly decreases when high levels of water saturation are present. In the present study, multichannel Rayleigh wave data was acquired through a 69 m long profile in the downstream embankment of an earth dam in Belo Horizonte – MG. Phase velocities were calculated with the MASW method and S-wave models were obtained after inversion of dispersion curves. The goal of the study was to interpret some of the main features of the dam embankment from Vs contrasts and to estimate the shear modulus variation along the profile. The Vs values ranged from 135 m/s to 750 m/s and the shear modulus ranged from 36 MPa to 1,125 MPa. Low velocity regions have been delimited and associated with possible areas of lower stiffness, while deep regions of higher velocity were associated with a transition zone between the embankment material and the saprolite foundation.Keywords: MASW surface waves; earth dam; applied geophysics.Uso do MASW para Caracterização de uma Barragem de Terra e Estimativa do Módulo de Cisalhamento em Belo Horizonte - MGRESUMO. Métodos geofísicos têm grande aplicabilidade para investigações em estruturas geotécnicas, complementando e preenchendo lacunas de informação associadas à instrumentação tradicional. A contribuição dos métodos sísmicos tem ganhado atenção nos últimos anos, uma vez que os campos de velocidade das ondas de corpo podem ser associados a módulos elásticos de interesse geotécnico. Em particular, a velocidade da onda S (Vs) correlaciona-se com o módulo de cisalhamento, que diminui significativamente quando altos níveis de saturação de água estão presentes. No presente estudo, foram adquiridos dados multicanais de ondas Rayleigh ao longo de um perfil de 69 m de comprimento no talude de jusante de uma barragem de terra em Belo Horizonte – MG. As velocidades de fase foram calculadas com o método MASW e modelos de ondas S foram obtidos após inversão das curvas de dispersão. O objetivo do estudo foi interpretar algumas das principais características do aterro de jusante da barragem a partir de contrastes de Vs e estimar a variação do módulo de cisalhamento ao longo do perfil. Os valores de Vs variaram de 135 m/s a 750 m/s e o módulo de cisalhamento variou de 36 MPa a 1.125 MPa. Regiões de baixa velocidade foram delimitadas e associadas a possíveis áreas de menor rigidez, enquanto regiões profundas de mais alta velocidade foram associadas a uma zona de transição entre o material de aterro e a fundação saprolítica.Palavras-chave: MASW ondas de superfície barragem de terra geofísica aplicada." @default.
• W4285451844 created "2022-07-15" @default.
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• W4285451844 date "2021-06-04" @default.
• W4285451844 modified "2023-10-06" @default.
• W4285451844 title "Use of MASW for an Earth Dam Characterization and Shear Modulus Estimation in Belo Horizonte – MG, Brazil" @default.
• W4285451844 doi "https://doi.org/10.22564/rbgf.v39i2.2103" @default.
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