Results of determining the deformation characteristics of a limestone-shell rock depending on its anisotropy

Abstract

The anisotropic properties of soil sediments and rocks have been studied by many researchers both in Ukraine and abroad. The distinctiveness of the research object was determined by the study of the anisotropy of a number of rocks properties and soils such as deformability, strength, swelling, permeability, etc. The most important from the point of view of the lower plane calculations are the deformation and strength anisotropy, introducing changes in the stress-strain state of soil masses. As a rule, the mechanical characteristics of anisotropic soils, along the bedding significantly exceed the corresponding parameters across the bedding. The widespread use of limestone-shell rock as the foundation for buildings and structures in the Odessa region, determines the need to expand research and make appropriate recommendations for taking into account anisotropy in real calculations. The methodology and results of determining the deformation characteristics of the «saw» limestone-shell rock in the device «OISI-4» are described. The authors found that the deformation modulus of the «saw» limestone-shell rock depends both on the pressure at which it is determined and on the direction of layering. In the pressure range from 0.2 to 1.0 MPa, the deformation modulus of the studied samples across the lamination was from 58 to 28 MPa, along the lamination from 64 to 41 MPa, and at an angle of 45° – from 63 to 30 MPa. Wherein the anisotropy coefficient of the load impact angle of 45° in average is 1,05-1,29, and when subjected to loading along the lamination – 0,94-1,49.