Abstract
Design and evaluation of the bearing capacity of micropiles are based on shear strength parameters of the soil within which a micropile is installed. These parameters are mostly received from laboratory tests or as an expert evaluation relying on soil description, classification and collected experience. This paper presents an approach that determines cohesion and angle of internal friction from diagrams of displacement on load, these being obtained by compression and traction load tests of real micropiles installed in the known soil. Furthermore, the diagrams are interpreted by the Mohr-Coulomb strength criterion and the desired values of shear strength are thus derived by using it.
Highlights
Bearing capacity of the micropile is determined by the state and shear strength parameters of the ground within which a micropile is installed
This paper presents an approach that determines cohesion and angle of internal friction from diagrams of displacement on load, these being obtained by compression and traction load tests of real micropiles installed in the known soil
The derivation of the shear strength parameters of soil ground was based on analysis of diagrams of displacement on load of micropiles
Summary
Bearing capacity of the micropile is determined by the state and shear strength parameters of the ground within which a micropile is installed. The achievement of the respective state is conditioned by the displacements of micropile in the ground. Calculations of the bearing capacity most often rely on data obtained either on samples tested in the laboratory or on an expert estimate by classification. Both these input data do not take into account state conditions completely and has never given technological procedures for micropile installation, yet both of which contribute significantly to the bearing capacity. Unlike computational methods based on laboratory or expert data, this approach encompasses the state conditions and technological procedures of micropile installation
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