During routine inspection works in 2006 inspectors found resurgences of water at the toe of a small embankment dam named ″Ribeirão do Gama″, located at Brasí­lia – DF. After technical visits, geotechnical engineers characterized these groundwater leakages as a piping process at an early stage. Intervention only began in 2015 due to obstacles that occasionally happen in public works. In consequence, the piping problem worsened. A geotechnical consultancy was contracted to design a solution. After analysis of field conditions, the consultancy decided to build overlapping columns by the Jet Grouting method. This paper presents a case study of the project and works treatment, detailing its design, construction, and monitoring.

Keywords: Cut-off, Earth dam, Jet grouting, Piping,

Submitted on April 13, 2017.
Final Acceptance on January 31, 2018.
Discussion open until August 31, 2018.
DOI: 10.28927/SR.411017