Jesús Barrios Sevilla

Settlement Predictions, Bearing Capacity And Safety Factor Of Subsoil Of Seville's Giralda

The works carried out during the last years in the Giralda of Seville, have provided an understanding of the foundations of the tower constructed next to the mosque, which had been built earlier. In a first stage, eight test boreholes were drilled with a 17°–18.5° inclination. The samples extracted were tested and analyzed, determining the typology, dimension, depth to the bearing layer of the tower and the characteristics of the materials forming the foundations. In the same way, vertical test boreholes were carried out at the tower surrounds, and soil samples were extracted at different distances for analysis and characterization. Five layers of the soil have been determined, from the superficial backfill layers to the blue marl found at a depth of −18 m. The data provided by this study have been used to calculate the settlements produced using a finite element program, specific for this construction type. This program has been designed considering the different loads and time spent for each of the six ...The works carried out during the last years in the Giralda of Seville, have provided an understanding of the foundations of the tower constructed next to the mosque, which had been built earlier. In a first stage, eight test boreholes were drilled with a 17°–18.5° inclination. The samples extracted were tested and analyzed, determining the typology, dimension, depth to the bearing layer of the tower and the characteristics of the materials forming the foundations. In the same way, vertical test boreholes were carried out at the tower surrounds, and soil samples were extracted at different distances for analysis and characterization. Five layers of the soil have been determined, from the superficial backfill layers to the blue marl found at a depth of −18 m. The data provided by this study have been used to calculate the settlements produced using a finite element program, specific for this construction type. This program has been designed considering the different loads and time spent for each of the six construction phases, including the Almohad construction (12th century) and the construction of the bell tower (built in the 16th century). Using the same program, a simulation has determined the circumstances in which the tower settlement would have generated the foundation collapse.

Study of the foundations of Cordoba's Mosque Tower

This research in Cordoba ́s mosque tower main objective was to analyze and characterize the foundations and the underlying soil, calculating the stability of the monument as well as the settlement and deformations performed, using traditional calculation methods and also by finite elements, and to determine differences between both, as well as the stability factor of the Minaret Tower. The works done to study the soil, were drill bores and dynamic penetration tests, classification of samples by size, Atterberg limits, physical and chemical analysis, showing the typical geotechnical composition of the Guadalquivir valley: an alluvial material composed by sand, gravels and silt clays. To study the foundations, inclined bore samples were extracted with 10-65o, showing calcarenite stone ashlars and lime concrete alternating with stone and brick masonry. To the samples from foundation, Stone masonry, lime concrete and bricks: Chemical components, dosage. Physical Properties: Density, porosity, absorption. Mechanical properties: compressive strength. From the data obtained by geotechnical campaign and the tests performed, we proceed to calculate settlement of foundations occurred in both phases of its construction: the first one that corresponds to the Muslim minaret built in 946, and the second one, the Christian cladding from 1523 the construction of the Bell Tower, that increased the height and the weight. To analyze the stability, two different methods were used, the traditional one (analytical calculation by Steinbrenner) and a finite element method with Plaxis software.

Estudio de la cimentación de los pilares de la Catedral de Sevilla

This study is done in order to answer a double request. On one hand to know the typology of foundation and the typology of the bearing soil of pillars of the cathedral in Seville, and on the other hand to determine if the existing cracks have a geotechnical origin. The accomplished research let us know that foundation is 1m overwide relative to the column section, and 5.70 - 5.90 m deep. As regards bearing soil, its geotechnical characteristics have been proved, so it may be deduced that the long period (90 years) for the construction of pillars, vaults and decks, allowed a slow consolidation and drainage of soil that have avoided a possible collapse or fall. According to this conclusion, the research will continue focusing now on the study of the characteristics of pillars and on the possible reasons that have provoked the appearance of fissures. From a geoarchaeological point of view, significant data of the occupational level of this area have been obtained. There are important conclusions to be drawn from the accomplished research about the sequence of occupation of this area since 1,000 years B.C.

Durabilidad del hormigón. Influencia de la concentración de cloruros en el agua de amasado y en disolución

The most aggressive situation which is responsible for most of the cases of steel reinforcement corrosion in concrete, takes place when chlorides are present in the environment. These chlorides destroy the passivating film of steel and promote the denominated pitting corrosion. In order to study the demonstrated corrosive action of chloride ions on concrete structures, a number of experiments have been designed, to quantify the effect of different amounts of this ion in concrete. Several mixes have been prepared with portland cement type II-C-35 to which it has been added, as an additive in mixing water, NaCl in increasing concentrations. The samples obtained were submerged in different dissolutions of NaCl. From the results obtained it is clear that the chloride content in mixing water does not affect the flux of calcium ions; however, its influence on the flux of chloride ions is significant. Likewise, it is confirmed that the existence of chloride ions in dissolution influences the migration of calcium and chloride ions.

Estudio de la adherencia piedra-mortero

Stones placates present a wide of problems that result in the fall of plates. One of the causes is the lack of adherence stone-mortar. We considered a study to determine the adherence between several cement mortars (1:3, 1:5, 1:7, 1:9 and a especial mortar prepared with latex) and stones (white granite, pink granites, black granites, white marble and cream limestones). The results obtained suggest that only adequate adherence rates (higher than 3 kgf/cm 2 ) achieved with cement mortar 1:3 and especial mortar. Besides it is observed that in the stones studied there is no relation between adherence and the absorption values.