Study of the Destruction Process of Sandstone and Mountain Samples

Abstract

Purpose. To compare laboratory and numerical studies of the process of destruction of rocks and mountain massif. Comparison of the results of laboratory and numerical studies of the process of destruction of rocks and mountain massif. Method. Laboratory tests of sandstone samples for uniaxial compression, physical modelling of the destruction and collapse of the roof rocks above the cleaning pothole, numerical modelling of the flat and three-dimensional stress-strain state of the rock massif (finite element method), continuous media method, surface contact interaction method, “restoration” method and “removal” of finite elements to simulate the process of destruction of the studied models. Results. The article presents the results of numerical modelling of both flat and three-dimensional stress-strain state of rock samples and massif, with determination of fracture zones and the fracture process itself. The processes of destruction of sample models for numerical research are compared with the processes of destruction of rock samples during laboratory tests. The results of the destruction process for the numerical modelling of the planar and three-dimensional stress-strain state of the rock massif around the created space are presented. Scientific novelty. For the first time, the results of the destruction zones of the mountain massif were obtained in a three-dimensional interpretation. For the first time, the results of the peculiarities of the process of destruction of sandstone samples under uniaxial compression were obtained. For the first time, the reshaping of the stress-strain state during the process of destruction of the coal massif was determined. Practical significance. The practical significance lies in the possibility of determining the parameters of the step-by-step process of the destruction of the coal massif during the working of coal seams and during mining operations. It is possible to predict the formation: coal seam squeeze zones in stages; the immediate roof collapse (the nature of the collapse); the main roof collapse.