Abstract
Strength and deformation of soil are determined in laboratory tests through shear strength and compression tests. However they do not take into account the impact of dynamic vibration which can cause thixotropy or fluidization of soil. To allow for that, a method which modifies the course of laboratory tests has been proposed. It includes dynamic vibration into shear strength and compression tests of soil. It makes it possible to measure and classify the tested ground with respect to susceptibility to thixotropy caused by dynamic vibrations which lower strength parameters of water saturated silty soils. Earlier research of soil strength parameters tended to underestimate the impact of dynamic vibrations which sometimes constitute initiatory impulse for numerous landslides in rockmass, especially in flysch.
Highlights
IntroductionTwo physical and mechanical parameters decide about strength and deformation of soil: the first one being shear strength, the second one - soil compression
Vibrations occurring in water saturated soils have two sorts of unfavourable effects; they cause decrease in shear strength and increase in subsidence
A method modifying course of laboratory tests has been proposed to take the above phenomena into account
Summary
Two physical and mechanical parameters decide about strength and deformation of soil: the first one being shear strength, the second one - soil compression. The above mentioned factors caused by dynamic impact can significantly change stress conditions and form strength parameters of soil. It mainly considers soils of considerable content of silt fraction (silty soils), especially when they are found in water saturated environment. Dynamic vibrations can have multiple impact on changes in soil strength: increase in strength caused by self-thickening of soil can be observed in case of unsaturated coarse soils, in case of water saturated cohesive silty soils a phenomenon called thixotropy can occur. The idea of the solution has been referred to and used in this article
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