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Abstract:

During recent years, a series of civil construction works have been started on all slopes from Iași Municipality. This study aims to analyse the stability of a perimeter from a southern slope of the city, in the area of Mihai Ciuca Street, Iași. For the development of a GF + 1 construction (ground floor and first floor) in this area geotechnical surveys were performed and soil samples were taken, which have been analysed by specific geotechnical methods. Starting from the values of the physical-mechanical parameters of the rocks, respectively from the aspects regarding the terrain geometry, different simulations were performed in order to identify its stability factor. These simulations took into account the presence or absence of construction, the existence of the current groundwater level or of a level close to the surface, as well as of the possibility of the occurrence of an earthquake. When we start from the hypothesis according to which all three factors act simultaneously on the researched land (the given construction load, the high groundwater level / current groundwater level and the earthquake), the values obtained are unfavourable. The results obtained for these situations indicate the following stability factors: 0.93 (when the groundwater is considered at the level of 3 m, with the loading of the construction and earthquake), respectively 1.2 (when the current groundwater level, load and earthquake are considered). These values are below the limit of the allowed stability coefficient of 1.25 (the value indicated by standards for the admissible safety factor, F_sadm). Also, the observations made on the field before, but also during the operation of the edifice exploitation, highlighted the punctual appearance of some geotechnical problems, which required the additional realization of some construction works (drains, retaining walls, gutters, etc.), imposing very high costs. The terrain continues to be modified by pushing phenomena on certain parts of the already existing construction, leading to the occurrence of cracks and infiltrations in the basement, to the deformation of a water tank or to the vaulting of the fence foundation. Without the adoption of specific measures to prevent the movement of land, there is the possibility of dynamization of the slope on certain parts and, consequently, this would lead to partial or total endangerment of the safety of the construction