Abstract
When designing the foundations of any building structure, it is important to know not only the load of the structure, but also the deformation characteristics of the subsoil. Their underestimation leads to incorrect design of the foundations or even to failures, the reparation of which requires considerable financial costs. The real values of the deformation soil properties gained from the geotechnical investigation often do not match the tabulated values used in the design. In this contribution, actual and tabular values of selected soil properties in the bedrock in the locality of Kosicka kotlina are compared. Simple buildings designed according to the 1st geotechnical category are in the described location predominantly based on Neogene clay of intermediate plasticity class F6 and less on clays class F8. These are soils sensitive to changes in their natural moisture – they swell when exposed to water, thus become unstable. It is therefore important to use the most accurate values in the calculation of the foundations. The analysis of 130 measured values confirmed that 52% of the all measured values are outside the indicative table data. The use of inaccurate input values can bring a risk and threat to safety, reliability and proper use of any construction. It is therefore necessary to carry out the appropriate geotechnical investigation of soils for all types of buildings.
Highlights
Each engineering structure must be designed in accordance with the Eurocodes (EC), not excluding the geotechnical structures for which Eurocode 7 [1] applies
The results were further analysed from the point of view of the ground plan design for the 1st geotechnical investigation, where the design is usually dependent on the soil class measured in the point about 2.0 m deep
The results of the analysis confirmed that 52% of the all measured values are outside the indicative table data; this is more than the half of the monitored data
Summary
Each engineering structure must be designed in accordance with the Eurocodes (EC), not excluding the geotechnical structures for which Eurocode 7 [1] applies. Constructions are assessed according to the theory of limit states; if these limit states are exceeded the construction is no longer reliable and safe. This means that all geotechnical constructions must be designed and constructed in such a way as to transfer all loading and load effects during their lifetime [2]. In the process of design or optimisation of geotechnical structures, the characteristics of the natural environment must be determined as accurately as possible in order to establish a reliable calculation model of the structure [3, 4]. A detailed geotechnical investigation is not always carried out, mainly because of lack of time or money
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