{"id":8166,"date":"2025-09-06T21:55:22","date_gmt":"2025-09-07T00:55:22","guid":{"rendered":"https:\/\/vinq.us\/?p=8166"},"modified":"2025-11-13T18:18:58","modified_gmt":"2025-11-13T21:18:58","slug":"erodibilidade-enrocamento-brechas","status":"publish","type":"post","link":"https:\/\/vinq.us\/en\/erodibilidade-enrocamento-brechas\/","title":{"rendered":"Influence of Rockfill Erodibility on Breccia Formation"},"content":{"rendered":"
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THE <\/span>training time<\/b> and the <\/span>gap geometry<\/b> are crucial factors in studies of hypothetical dam rupture, as they directly influence the volume mobilized and the rupture hydrograph.<\/span><\/p>

For the analysis, two main models were adopted: <\/span>Froehlich (2016)<\/b>, aimed at defining geometric and temporal parameters in cases of instability, and the <\/span>massif erodibility method proposed by Meng (2025)<\/b>, applied to situations of overtopping or internal erosion. In the latter, the formation time and depth of the breach are conditioned by the <\/span>erosion resistance of the material<\/b>.<\/span><\/p>

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Application of Meng's Methodology (2025)<\/b><\/h2>

In the simulated scenarios for the main massif, Meng's (2025) methodology was used to evaluate the breach opening, assigning to the <\/span>erodibility index (Kh)<\/b> fundamental role in determining erosive progression.<\/span><\/p>

However, the study does not present Kh parameters specifically applicable to rockfill. This limitation compromises the applicability of the method in this region of the massif, since rockfill structures have significantly higher resistance to hydraulic drag. This is due to the greater weight of the blocks, <\/span>natural interlocking<\/b> and to the <\/span>spreading material with a bulldozer during construction<\/b>, which generated greater embedding of the blocks.<\/span><\/p>

Technical literature describes that, in rockfill composed of large, interlocking blocks, there is a combination of <\/span>high critical drag stress (\u03c4cr)<\/b> with <\/span>high erodibility index (Kh)<\/b>. In this way, the breach takes time to form, but once it does, it can evolve if there is enough force to destabilize the constructed matrix.<\/span><\/p>

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Importance of Defining Erodibility Parameters<\/b><\/h2>

The correct definition of erodibility parameters is essential, as it directly impacts the <\/span>gap opening time<\/b> and in their <\/span>final dimensions<\/b>. Therefore, it is recommended to use methodologies that consider criteria of <\/span>hydraulics of riprap-lined canals<\/b>, evaluating the physical possibility of mobilizing this material.<\/span><\/p>

In this context, simple and complementary methodologies are suggested that compare the <\/span>hydraulic stress available in the gap<\/b> with the <\/span>rockfill resistance<\/b>. Among the applicable calculations, the following stand out:<\/span><\/p>