Abstract
The mechanism of cohesive soils response to cycling loading is less investigated compared to cohesionless soils. Multiple load-unload cycles cause significant changes in the structure of cohesive soils, which result in complex behaviour under the given load. The aim of the paper was to investigate and study the influence of load frequency on cohesive soil reaction. In order to obtain results, tests were conducted using the cyclic triaxial apparatus. Three cyclic tests were carried out, each for different frequency −0.5 Hz, 1.0 Hz, 2.0 Hz and one static triaxial test. The maximal value of deviator stress qmax, used in the cyclic tests, was set to 40 kPa. Afterwards samples were unloaded to qmin = 30 kPa. Cyclic loading triaxial tests were performed in a consolidated-undrained (CU) one-way loading manner, a sinusoidal waves were used. After the cycling loading was completed, a static triaxial shear test was conducted. Changes in the cohesive soil responses depending on cycling load frequency were presented in the paper. Differences in the accumulation of plastic strains were noticed, as well as changes of degradation index values, resilient degradation index values and differences in the excess pore water pressure development.
Highlights
Analysis of the influence of cyclic load acting on a soil is a common geotechnical problem nowadays
This paper presents results of cyclic triaxial tests where impact of cyclic loading on cohesive soil response was studied
Three series of cyclic triaxial tests and one static triaxial test were performed to investigate the frequency impact on cohesive soil respond
Summary
Analysis of the influence of cyclic load acting on a soil is a common geotechnical problem nowadays. The repeating loading problem was limited to the issue which includes the studies on dynamic load bearing capacity of foundations, the reaction of machine foundations subjected to dynamic loads, the interaction between soil and surrounding constructions loaded by earthquake-generated seismic waves and the strength of dams and embankments during an earthquake [1,2,3]. Most of the technical design standards do not include the rules concerning the behaviour of cohesive soils subjected to cyclic load [4]. Natural sources (water waves, earthquakes, storms, etc.) and human activity (machinery vibration, wind power plants, construction operations, traffic loads and many others) are known to be the sources of this particular type of load. Proper identification of load characteristics has a special importance when reconstructing the load conditions in the laboratory [8]
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