Authors: E. Ignatov, M. Tyulenev

Title of the article: Geomechanical regulations for the selection of element base parameters and their implementation in technical solutions

Year: 2021, Issue: 2, Pages: 33-63

Branch of knowledge: 25.00.22 Geotechnology (underground, open and construction)

Index UDK: 622.268.2:622.831

DOI: 10.26730/2618-7434-2021-2-33-63

Abstract: Geomechanical researches, stated by us in the previous articles, make it possible to formulate the basic regulations to the parameters of the element base and to develop appropriate technical solutions, which marked the directions of improvement of the element base of pillarless technology, allowing to introduce flexible technological characteristics in the methods of preparation and mining of excavation fields, ways of protection and guarding devices of workings, ways of fastening and design of fasteners.
Geomechanical regulations consist of geomechanical peculiarities of the process of displacement and destruction of the roof rocks and the edge of the seam and, conditioned by them, operational requirements for choosing technological and structural parameters of new technical solutions.
From the analysis of the results of the experiments described earlier, the following geomechanical peculiarities affecting the choice of the method of anchoring and support of preparatory mine workings have been revealed: the values of roof displacements along the length of working vary by 400%; the values of displacements and their intensity vary in the working’s section by up to 80%; the displacements along the working’s axis, which are located on the border of "massive – caving rocks", cause the loss of stability and deformation of support frames; when the second face enters the bearing pressure zone, the displacements of roof rocks in the section of working from the mined-out space or coal massif become active first, depending on the form of destruction of the roof.
It is established that the lines of equal displacements are parallel to the axis of working; the destruction of the edge part of the coal seam reaches 6-8 m; the seam destruction is accompanied by its movement towards the worked-out space; the parameters of the roof destruction vary along the working-out length; the roof destruction in the preserved working-out reaches 2-4 m from the seam edge.
This article discusses the relationship between these features and operational requirements.

Key words: mine support underground coal mining development mine workings mined-out space pillarless technology protection of mine workings rock pressure

Receiving date: 11.06.2021

Approval date: 23.07.2021

Publication date: 14.10.2021

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