\n
Abstract: <\/b>Experimental modeling of the effects of subsidence on the stability of submarine slopes seeks to understand the mechanisms that can lead to the destabilization of these submerged terrains. Through controlled experiments, the redistribution of stresses, soil deformations, and potential triggers for submarine landslides are analyzed. The results assist in the calibration of numerical models, contributing to the safety of offshore infrastructure and the reduction of environmental and economic impacts.<\/span><\/p>\n<\/div><\/div><\/div><\/div>
2023<\/strong><\/h3>\n<\/div>Rheological parameterization of submarine landslides
<\/h2>Partner:<\/b>Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>Fluxo de detritos submarinos est\u00e3o entre os principais geohazards conhecidos e precisam ser levados em conta nos projetos de estruturas submarinas de explora\u00e7\u00e3o e produ\u00e7\u00e3o. Nesse contexto, a avalia\u00e7\u00e3o do alcance (run-out) desses escorregamentos \u00e9 de grande import\u00e2ncia, assim como sua correla\u00e7\u00e3o com os par\u00e2metros rol\u00f3gicos de comportamento do solo em fluxo, tais como umidade e taxa de cisalhamento. Dessa forma, a valida\u00e7\u00e3o de simula\u00e7\u00f5es num\u00e9ricas permite a sua ado\u00e7\u00e3o na previs\u00e3o desses eventos, aumentando o grau de confiabilidade da avalia\u00e7\u00e3o de risco de opera\u00e7\u00e3o das plantas submarinas. Sendo assim, este projeto visa parametrizar uma corrida de detritos submarina a partir de ensaios reol\u00f3gicos realizados em re\u00f4metro de bancada e ensaios centr\u00edfugos que simulam esse fen\u00f4meno.<\/span><\/p>\n<\/div><\/div><\/div><\/div>
2022<\/strong><\/h3>\n<\/div>Geotechnical experimental tests in a centrifuge on the load capacity of a cluster of two T-120 piles and one T-150 pile
<\/h2>Partner:<\/b>Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>Torpedo piles are widely used as fixed anchor points in regions with predominantly clayey marine subsoil and low undrained strength. To analyze their behavior in the field, this project plans to use centrifugal models to evaluate the performance of a cluster composed of two T-120 torpedo piles in comparison with isolated piles, one T-120 and one T-150, both with their tops buried in low-strength, undrained clay soil. The analysis will be conducted with a prototype on a scale between 1:2 and 1:1, ensuring physical similarity in terms of load capacity. By investigating and validating these models in controlled environments, the study will identify best practices for maximizing the efficiency and reliability of torpedo piles under different operating conditions.<\/span><\/p>\n<\/div><\/div><\/div><\/div>
2021<\/strong><\/h3>\n<\/div>Assessment of Fragile Layers in Submarine Slopes
<\/h2>Partner:<\/b>Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>This project aims to investigate the potential effects of weaker clay layers on the seismic behavior of submarine slopes. The goal is to identify soil shear strength limits that can delimit and distinguish between minor and potentially significant effects of fragile clay layers on the seismic response of submarine slopes. The expected results are: - To deepen knowledge about the seismic behavior of weaker layers (weak layers) and their influence on the dynamic stability of submarine slopes; - To evaluate the general dynamic behavior of slopes during seismic excitation, as well as the mechanisms of amplification\/deamplification of the dynamic response of slopes; - To evaluate the dynamic parameters that allow the response of weak layers to seismic stresses to be quantified; To obtain the seismic amplification factors at each position of the accelerometers installed on the slope, dividing the measured acceleration history by the output movement acceleration.<\/span><\/p>\n<\/div><\/div><\/div><\/div>
Seismic Stability Assessment of Gentle Slopes<\/h2>Partner:<\/b> Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>Este trabalho consistiu no estudo da estabilidade de taludes submarinos de cerca de 5 graus de inclina\u00e7\u00e3o sob solicita\u00e7\u00f5es s\u00edsmicas. As an\u00e1lises visaram \u00e0 determina\u00e7\u00e3o das superf\u00edcies de escorregamento cr\u00edticas e <\/span>\u00e0 avalia\u00e7\u00e3o This work consists of studying the stability of submarine slopes with an inclination of approximately 5 degrees under seismic stress. The analyses aim to determine critical slip surfaces and evaluate safety factors for sediment deposits found in the offshore environment. The study of low-slope slope models under seismic stresses allows us to perform a more realistic analysis than conventional pseudo-static analyses. The seismic response of low-slope slopes will be evaluated using centrifuge physical modeling on clay models, which will allow the validation of finite element numerical models, enabling complementary analyses to be performed. All analyses will take into account seismic stresses representative of the Brazilian coast. This report presents a general review of the concept of infinite slopes with preliminary calculations of critical depths (at which rupture surfaces are expected to develop) in terms of static and pseudo-static calculations. Finally, the proposed test program is presented, together with the experimental configuration and schedule for the different centrifuge tests.<\/span><\/div>\n<\/div><\/div><\/div><\/div>
Physical Simulation of Fault Propagation in Marine Clay Deposits - Fault Propagation
<\/h2>Partner:<\/b> Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center\n<\/div>\n
Duration:<\/b> 2019-2021<\/div>\n\n
Abstract:<\/b> This project aims to investigate the mechanisms of fault propagation in marine clay sediment packages, evaluating the influence of fault types and processes on the interaction with direct foundation structures, piles, and pipeline lines supported on the ground. The methodology to be employed can be divided into centrifuge physical modeling and numerical modeling. Centrifuge physical modeling aims to obtain, under similar conditions, the stress-strain behavior for various conditions of interest involving soils from the region under study. To this end, the COPPE\/UFRJ geotechnical arm centrifuge will be used. The aim is to simulate the geological movement of a clay massif on a reduced scale using an actuation system that allows normal and reverse faults to be replicated. Numerical modeling aims to better understand the mechanisms of fault propagation in sedimentary soils based on the validation of results from physical tests. The expected result is to improve the understanding of the mechanisms of fault propagation induced by geological movements, providing safer and more reliable geotechnical parameters to support projects involving direct foundations, piles, pipelines, and similar structures located in fault zones.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div>
2018<\/strong><\/h3>\n<\/div>Centrifuge Seismic Simulation of Submarine Slopes<\/h2>Partner:<\/b> Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>The objective of this project is to propose the development of conventional physical modeling and geotechnical centrifuge tests of the behavior of typical Brazilian coastal submarine slopes subject to earthquakes. The first phase will consist of static tests in COPPE's new geotechnical beam centrifuge. The second phase will involve conducting dynamic tests on a flying vibrating table in IFSTTAR's geotechnical beam centrifuge to simulate seismic stress. In a third phase, numerical analyses will be performed to validate the results obtained in the physical tests.<\/span><\/div>\n<\/div><\/div><\/div><\/div>
2017<\/strong><\/h3>\n<\/div>TDPFLEX - Stress Analysis in Flexible Riser TDP<\/h2>Partner:<\/b> Tecnip Brazil \u2013 Engineering, Facilities, and Offshore Supports<\/div>\n
Abstract: <\/b>Development of a methodology or guideline for analyzing riser\/soil interaction, to be applied in commercial dynamic analysis programs (DEEPLINES, FLEXCOM, and ORCAFLEX) or used in conjunction with them. The objective is to improve the realism of results related to compression and the radius of curvature of flexible structures in the TDP region. This methodology or guideline may be complemented by programs specialized in line\/soil interaction or by parameterizing the compression and radius of curvature results obtained from dynamic analyses performed in specialized software.<\/span><\/div>\n<\/div><\/div><\/div><\/div>
2011<\/strong><\/h3>\n<\/div>PRODIR Phase 2 - Guidelines for Soil-Pipeline Interaction Projects<\/h2>Partner:<\/b> Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>Phase 2 of research for the development of Guidelines for Soil-Pipe Interaction Projects \u2013 Mobilized resistance and deformations in pipes when buried in clayey and sandy soils subject to movement.<\/span><\/div>\n<\/div><\/div><\/div><\/div>
2008<\/strong><\/h3>\n<\/div>PRODIR Phase 1 - Guidelines for Soil-Pipeline Interaction Projects<\/h2>Partner:<\/b> Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>Phase 1 of research for the development of Guidelines for Soil-Pipe Interaction Projects \u2013 Resistance to lateral and upward movement of buried pipes in clayey and sandy soils.<\/span><\/div>\n<\/div><\/div><\/div><\/div>
2003<\/strong><\/h3>\n<\/div>GEODUTO - Geotechnical Studies of Buried Pipelines<\/h2>Partner:<\/b> Leopoldo Am\u00e9rico Migu\u00eaz de Mello Research and Development Center<\/div>\n
Abstract: <\/b>CT PETRO Research Project with FINEP\/PETROBRAS funding to study lateral buckling of pipelines buried totally and partially in soft soils.<\/span><\/div>\n<\/div><\/div><\/div><\/div>
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