A COMPARISON OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF KOLA SUPERDEEP BOREHOLE CORE SAMPLES AND THEIR SURFACE ANALOGUES

Abstract

The article presents experimentally determined physical and mechanical properties and elastic anisotropy of three core samples of metamorphic rocks (gneisses), which were drilled out and lifted from depths of 6849 – 8411 m of the Kola Superdeep Borehole (SD-3) and their surface analogues. Acoustopolariscopic measurements of parameters of anisotropy of samples were carried out in the Geological Institute of the Kola Science Centre of RAS, Apatity. Particle density, bulk density, porosity, simple compressive strength, modulus of deformation, Young ́s modulus of elasticity and Poisson ́s ratio were determined in the Institute of Rock Structure and Mechanics of AS CR, Prague. Laboratory tests known from rock mechanics were used for this purpose. From the results obtained, differences in physical properties between samples from SD-3 and the surface are evident.