Retroanálise do processo construtivo e análise de estabilidade de talude de um barramento: estudo de caso

Abstract

The main objective of this work is to carry out a case study through a retro analysis of the construction process of a small earth dam, located in the municipality of Alegrete-RS. For this, initially, the construction process was monitored in situ through surveys and sample collection. Also, in situ, Sand Bottle tests (NBR 7185/1986) and permeability tests were carried out at various points of the dam massif. Then, in the laboratory, through the samples collected from the dam under study, geotechnical characterization tests were carried out (NBR 6457/2016, NBR 7181/2016, NBR 6459/2016, NBR 7180/2016, NBR 6508/1984 and NBR 6458/2016), Proctor Normal compaction test (NBR 7182/2016) and the direct shear test, to obtain the resistance parameters of the collected samples. The results of the resistance parameters and physical indices of the tested samples served as road data to calculate the stability of the dam slope, through the GeoStudio software (2020), full license. Finally, knowing the Risk Potential of the dam is based on the pathological survey of the Regular Inspection Sheet for Earthen Dams provided by (ANA/2016). The study presented results obtained through simulations of the upstream and downstream slopes, under normal operating conditions, the rapid and gradual lowering of the reservoir, and safety factors above the minimum allowed. Despite some irregularities witnessed during the monitoring of the construction process of the dam, during the stability analysis of the slopes, even in conditions of increased seismic load, the results proved the safety of the dam, after entering into the normal operating regime, rapid lowering, and gradual reservoir.