Optimization procedures offer a possibility for time-effective determination of input parameters values for complex soil constitutive models. The following paper presents a combination of the metaheuristic Particle swarm optimization method (PSO) and commercially available solver based on the finite element method (FEM). After the brief theoretical description, different alternatives to the PSO method are reviewed and tested. An optimal alternative is chosen and further used. In the second part of the paper, the combination PSO -FEM is utilized for a fully automatic derivation of input parameters values for the Hardening small strain model from pressuremeter tests. Predicted pressurevolume curves from the axisymmetric FE model gradually converge towards the measured curve until the accuracy criterion is reached.

Fibre reinforcement is an effective method of soil improvement that presents an alternative solution to other more common methods of ground reinforcement, such as mechanical stabilization by geosynthetics (geogrids, geotextiles, geocomposites, etc.). Research activities in this area are being carried out, but the main disadvantage of currently used fibres is their uniform cross-section and usually smooth surface given by available production methods. This study presents an alternative way of fabrication of synthetic fibres – utilization of fused deposition modelling (3D printing). With the rapid development in commercially available 3D printing techniques, it is now possible to refine the shape and dimensions of the 3D printed objects to a tenth of a millimetre. The review of the basic index and mechanical properties of fibre-reinforced soils is presented in the first part of the paper. The second part is devoted to the description of the production process of fibres including the suitability analysis of materials used for 3D printing. Finally, the initial testing programme of fibre-reinforced non-cohesive soil is presented. The preformed laboratory test confirmed that the inclusion of 3D printed fibres led to a significant increase in shear strength. Examination of samples after tests did not reveal breakage of fibres, thus the fibres pull-out was the governing failure mode.

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Monitoring konstrukcí se obvykle využívá pro ověření chování navržené geotechnické kontrukce. Tato měření mohou být využita i jako alternativa pro stanovení materiálových parametrů s využitím optimalizační procedury, která slouží jako nástroj k určení vstupních parametrů materiálových modelů z výsledků inklinometrického měření pažící konstrukce. Optimalizační procedura Particle swarm optimization (PSO) pro řízení změny materiálových parametrů byla spojena se skriptovací úlohou provádějící předávání dat softwaru Plaxis založeného na MKP. Tímto postupem byly optimalizovány vstupní parametry pro Hardening soil model pro brněnský neogenní jíl. Výsledky optimalizačních procedur potvrdily, že je možné optimalizce využít jako vhodný nástroj pro stanovení parametrů zemin pro materiálové modely.

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