The paper presents an application of statistical and numerical methods for the determination of the forcedisplacement
curves and that of pullout capacity of prestressed grouted ground anchors installed in Miocene clay. A regression
analysis of data from a database of acceptance test records for ground anchors to create has been performed, the
force-displacement curve of the tested anchor corresponding to the range of loads applied for acceptance tests has been
created. A linear regression model, employing the weighted least squares method and robust standard errors techniques
were concluded to serve as a reliable statistical method suitable for achieving this goal. The discovered linear regression
dependence then served as a lower control limit for the displacement values calculated at the anchor head applying the
numerical model. A finite element model has been created to predict the behaviour of ground anchors being installed in
fine-grained soils. The developed numerical model that employs Mohr-Coulomb strength criterion constitutive model
evaluates the influence of high-pressure grouting by development additional radial stresses and that of an increment of
fixed length diameter.
Abstract. Ground anchors represent an important structural element in the area of geotechnical engineering. Despite their extensive usage, a design process of these elements is usually performed using simple empirical and semi-empirical methods, neglecting several important influencing factors. This paper gives an analysis of the factor of non-uniform distribution of skin friction resulting in a progressive failure of ground anchors. First, the finite element method in combination with a material model involving regularized strain softening is utilized. Next, an experimental program, including several investigation anchor load tests, was carried out. The goal of this program was to confirm preliminary conclusions drawn from numerical studies and to obtain relevant data for further back analysis. After, there is then described a newly developed application based on the load transfer method, in which all the findings from numerical computations and experimental measurements are incorporated.
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