Physico–mechanical properties of rocks have great significance in all operational parts in mining activities, from exploration to final dispatch of material. Compressional wave velocity (p-wave velocity) and anisotropic behaviour of rocks are two such properties which help to understand the rock response under varying stress conditions. They also influence the breakage mechanism of rock. There ...

Based on CT experiments of the mechanical behavior a certain sandstone, safety zone, damaging and fracture zone geotechnical materials were defined, threshold standard this was discussed empirically selected. Mathematical morphological image measurement technology used to analyze information each section, variation law sandstone number with loading process conditions studied. According statisti...

Abstract Based on the review of a wide range literature, this paper finds that: (1) average specific surface energy various single crystals is only 0.8 J/m 2 . (2) The fracture rocks with pre-crack under static cleavage tests 4.6 (3) pre-cut notch but no tensile (mode I) (4) energies regular rock specimens neither pre-made crack nor are 26.6, 13.9 and 25.7 uniaxial compression, tension shear te...

The article is devoted to the assessment of productivity and morphological indicators egg quality maternal lines Cornish Plymouth Rock breeds new Russian Smena-9 cross. It was found that during breeding meat hens (from 2019 2021), production increased by 1.6-2.2% (Cornish) 2.2-4.3% (Plymouth Rock) 30 52 weeks life. There a 0.1-1.9% decrease in eggs with such defects as double-yolk, irregular sh...