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Restoration Project of vernacular architecture affected for ground subsidence. A case study in Juslibol Church (Zaragoza, Spain)

ABSTRACT By request of the Archbishopric of Zaragoza there is realized from 2011 an exhaustive study of the situation of the Parish Church dedicated to the Asunción of Our Lady (XVIIIth century) of Juslibol (Zaragoza, Spain). This Church has suffered for many years problems of deformations and settlements caused by the combination of several particularly unfavorable factors, such as: the poor quality of the support ground, its situation on a slope on a half-slope, and leaks from a supply network, and especially sewage network, which have favored processes of dissolution-subsidence of the ground below foundations. A support system (jet-grouting), such as underpinning, was provided to ensure the stability of the structure but the problem does not fit only to the building of the Church. An aspect that had not been sufficiently addressed until now is the situation of cracks recognized in the Church in relation to those existing in the surrounding area. From the diagram of the recognized cracks in the pavement of the streets and squares, as well as in the buildings themselves, a lateral correlation of these can be made; obtaining a system, toward the top of the slope, in consecutive discharge arches, that give sense to the idea of a descending flow that fits well to the morphology of alluvial fan of the primitive ravine It can be said that the problem affecting the Church, as regards the movements it is recording at the moment, has its origin in a much broader area which includes at least a part of the slope that corresponds to the old alluvial fan of the ravine that is located right in the head. Currently, models and calculations have been made that have allowed us to assess a restoration-stabilization project that has recently been initiated.