STUDY OF STABILITY OF ROLLING DEFORMATION OF STEEP LAYERS TAKING INTO ACCOUNT THE DAMAGE OF ARCH MOUNTING

Author:

Podkopaiev Serhii1,Volkov Serhii1,Bessarab Iryna1,Demchenko Oleksandr1,Kipko Oleksandr1

Affiliation:

1. Donetsk National Technical University

Abstract

Purpose. To investigate the stability of rolling back sections of steep layers by the method of protecting all coal, taking into account damage to the arch fastening along the length of the excavation section to assess the operational state of the preparatory production. Methods. To achieve the goal, mine instrumental observations of the stability of the rollback lines and the damage of the arch attachment in them along the length of the excavation were carried out. Results It is experimentally substantiated that increasing the density of the arch fastening installation in the preparatory work by 25% allows to reduce the convergence of side rocks along the contour by 5-7%. If the rollback area is protected by all the coal, at a distance of l50 m behind the cleaning well, a short-term stable state of production is ensured. At the same time, the frequency of damage to the flexible arch attachment is within 0.1 w 0.14. When the length of works increases to l>50 m, when the relative deformation of protective structures exceeds >0.25, their bearing capacity is lost and their destruction occurs. In such conditions, with the intensification of the convergence of the lateral rocks, the frequency of damage increases by 60-75%, which leads to a loss of 50% of the cross-sectional area of the rollback stretch and the impossibility of its further safe operation. Novelty. The functional dependence between the change in the relative deformation of the coal aggregates and the length of the preparatory workings l (m) was established, which has the form of a logarithmic function until the moment of the loss of the load-bearing capacity of the structures of the upper fence. , when the statistics of univariate analysis of variance of fastener failures have a standard normal distribution. Practical significance. The method of protecting preparatory workings with whole coal has a limited field of application due to the limited deformation resource of protective structures. In the zone of influence of cleaning works along the length of the mining area, the method of protecting the entire coal does not ensure maintenance of the workings without repair. Increasing the density of the fastening installation in the preparatory works will not significantly change the geomechanical situation in the coal massif.

Publisher

Donetsk National Technical University

Reference12 articles.

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