Management of the dynamic properties of a base modified by deep soil mixing technology

Abstract

Conversion of building properties is performed primarily to reduce the compressibility of the base and increase strength. However,in addition to changing the static properties of soils,it is necessary to take into account changes in dynamic properties,such as dynamic shear modulus,damping coefficient,velocity of elastic shear and longitudinal waves. Thus,it is possible to control the dynamic properties of the base by converting the construction properties of soils. In this paper,we consider the change in the velocity of shear waves in a base transformed by the technology of deep soil mixing (DSM). In the work,the influence of additional vertical stresses on the dynamic properties of the bases transformed using deep soil mixing technology was evaluated. As a parameter that allowed us to evaluate the dynamic properties,the propagation velocity of elastic shear waves was chosen. Shear wave velocity was estimated based on the results of triaxial tests using the method of low-amplitude torsional vibrations in a resonant column. The research results showed that at small values of axial strains,there is no significant increase in the velocity of shear waves,an increase in the speed of shear waves by two times with an increase in stress by 0.6 MPa.