Prohorec L. Shock pulse method development for the express control of rock strength and elements of geocomposite structures

The object of research: interaction processes between hammer and geomaterials and elements of geocomposite structures. The purpose of the work is to develop a shock pulse method applied to the express control of rock strength directly at the place of their occurrence and elements of geocomposite security-supporting structures in place of their use to improve safety and increase service life of the mine and geocomposite structures. Subject of research: shock pulse method for the express control of rock strength and elements of geocomposite structures. Research methods. The research is based on an complex approach, which includes: analysis and generalization of experimental and theoretical achievements on this problem; theory methods of elasticity, impact, mechanics of continuum medium and rocks mechanics, as well as laboratory and field studies of the collision processes between rigid body and rocks and elements of geocomposite security structures using developed at IGTM NASU measuring equipment. Scientific results: for the first time theoretically established that while increasing the tensile strength of the material in the uniaxial compression, the duration of the shock pulse is decreasing by the degree; for the first time experimentally observed parabolic decrease of the shock pulse duration depending on the force of impact and its subsequent stabilization, stabilization and start of the section is individual for each type of material; established for the first time the conditions for increasing informative value of the shock pulse method for determining the strength of the materials.; shows, that when the ratio of acoustic stiffness of the material and the hammer from 1 to 100 changes in the relative informative signal are within 0,05 - 1; shock pulse method was further developed, that for the first time uses duration of the shock pulse as an informative parameter, enabling improved detection of weak zones in the rock mass in the areas of geological faults. Practical value: developed a method for assessing the strength of the medium by a shock pulse method applied to rocks and elements of geocomposite security-supporting structures in underground conditions; developed means of assessing the strength of rocks and elements of geocomposite security structures by shock pulse method. Implementation of the results. The results of studies are included in the regulatory and technical documents "Technological regulations of diagnosing and repairing buried and underground structures of the surface complex of mines based on the technology of crating geocomposite structures" and "Methodological recommendations for the express determination of elastic and strength properties of rough rock sample and elements of geocomposite structures using non-destructive control methods", approved by the Ministry of Coal Industry of Ukraine.