Ménard and Cambridge selfboring pressuremeters: correlations between mechanical parameters in miocene sandy soils

Comunicação apresentada em 6º Congresso Luso-Brasileiro de Geotecnia/XIII Congresso Nacional de Geotecnia, Lisboa, 16 e 17-20 de abril respetivamenteNo presente artigo apresenta-se um estudo de caracterização mecânica de areias miocénicas de Lisboa, efectuado a partir de ensaios pressiométricos. Foram realizados ensaios em terrenos no domínio dos solos rijos e das rochas brandas, no âmbito dos trabalhos de ampliação da rede do Metropolitano de Lisboa. Este estudo foi elaborado a partir de ensaios executados com um pressiómetro de Ménard e um pressiómetro autoperfurador de Cambridge. Procedeu-se ao cômputo do coeficiente de impulso em repouso a partir dos resultados experimentais, tendo-se obtido leis de crescimento em profundidade de parâmetros de deformabilidade. Estabeleceram-se correlações entre valores de pressão limite obtidos pelos pressiómetro Ménard e valores de ângulo de atrito determinados através do pressiómetro autoperfurador CSBP.This paper presents a mechanical characterization of Miocene sands of the Lisbon subsoil, carried out by pressuremeter tests. These tests were performed with a Ménard pressuremeter and a Cambridge selfboring pressuremeter in sandy materials classified as hard soils and soft rocks in the scope of the enlargement of Lisbon underground network. The coefficient of earth pressure at rest was computed, as well as the law of the increase with depth of the stiffness parameters. In the end, a correlation between the Ménard limit pressure and the CSBP angle of shearing resistance was established

Raça Sorraia: primeiro nascimento mundial por transferência embrionária

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A biomimetic tissue engineering scaffold for repairing the injured spinal cord: proof of concept

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Preliminary Analysis of Slope Instability Processes Triggered in the Guilherme Creek Watershed (Nordeste Municipality, S. Miguel Island, Azores)

The Nordeste Volcanic Complex is located in the NE sector of S. Miguel Island (Azores) and it is composed of geological formations with about 4 million years old, extremely weathered. This fact, allied to the steep slopes on the area, promotes the occurrence of slope instability phenomena. In particular, the Guilherme Creek watershed has a high recurrence of this type of geological hazard, mainly triggered by precipitation, which promotes a high density of landslides in the area. Considering as main objective the landslide susceptibility analysis in the Guilherme Creek watershed, using statistical/probabilistic methods, it is ongoing an inventory process of these phenomena in a GIS, based on the aerial photography interpretation and fieldwork. Currently, the inventory is concluded based on aerial photography from 1982 and orthorectified aerial photography from 1995 to 2005. In order to validate and update the landslide inventory produced in the office, fieldwork has been carried out using, besides more traditional techniques, a drone (DJI Phatom 4 PRO). This tool has allowed studying steep slopes, which would otherwise be impossible to access in an area with a high forest density and very steep slopes. Until now, 517 landslides have been identified in the study area, mainly belonging to slides and falls typologies.GeoBioTe

Safeguarding of the Portuguese heritage: the case study of Safi Cathedral, Morocco

The city of Safi is located in the West African coast, about 150 km from the city of Marrakesh and 300 km south of Casablanca, Morocco. The Cathedral of Safi was the first Portuguese cathedral outside Portugal during the Expansion period and it is the most important example of the non-military Manueline architecture that still remains outside Portugal. The construction of the cathedral started during the decade of 1520. It was originally a three nave church and is believed to be similar to other temples of the time such as the Funchal or Guarda Cathedrals. During its history, the cathedral was occupied by Muslims who eliminated the naves, leaving only the main altar, one lateral chapel and an outside wall. The space of the naves was used to add several residential buildings and they turned the altar in a bathhouse for women (hammam in Arab). The altar, crowned by a ribbed vault, the lateral chapel whose roof, also vaulted, is missing and one alone standing external wall are the only original parts of the structure that are left. The Cathedral will be soon submitted to a structural intervention. The intervention includes the preservation of the original remains of the Cathedral, the correction of existing problems in the structure, improvement and installation of new infrastructure to support tourism and cultural events. Therefore, safety conditions and the conservation of the built heritage as a museum space must be assuredThe authors would like to thank the Fundacao Calouste Gulbenkian for the opportunity to study the Safi Cathedral and for all the support during the preliminary studies, the inspection and diagnosis works, and in the design project

Chondrocyte incorporation onto electrospun scaffolds for cartilage tissue engineering

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Cohesive mixed-mode damage model applied to the simulation of the mechanical behaviour of a repaired sandwich beam

The behaviour of a repaired sandwich beam loaded under four point bending is simulated using theABAQUS® software. Both overlap and scarf repair, suitable for sandwich structures, were simulatedconsidering two dimensional nonlinear material and geometrical analysis. Special developed interfacefinite elements including a trapezoidal cohesive mixed-mode damage model appropriate for ductileadhesives were used in order to simulate the adhesive layer. The proposed model is intended to replacethe continuum finite elements traditionally used to simulate the adhesive layer, thus reducing thecomputational effort necessary to obtain results. Double Cantilever Beam (DCB) and End NotchedFlexure (ENF) tests were used to obtain the cohesive laws of the adhesive in pure modes I and II,respectively. The fracture energies (JIc and JIIc) are obtained using a new data reduction scheme based oncrack equivalent concept allowing overcoming crack monitoring difficulties during propagation in thesefracture characterization tests. The remaining cohesive parameters (1,I, 1,II, 2,I, 2,II)are obtained usingan inverse method, which is based on the fitting of the numerical and experimental P- curves by a finetuning process. This procedure allows fixing the referred cohesive parameters to be used in the stressanalyses and strength predictions of repaired sandwiches. The numerical model allowed the simulation ofdamage initiation and growth. Geometric changes, such as patch overlap length and scarf angle wereconsidered in the analysis in order to assess their influence on the repair efficiency. Conclusions weredrawn about design guidelines of sandwich composite material repair

Bio-electrospraying of chondrocytes for cartilage tissue enginnering applications

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Electrosprayed cells proliferative behaviour in a 3d microporous scaffold

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