Abstract
One of the current trends in the technology of supporting capital and preparatory workings is the use of contact grouting. The contact grouting is designed to increase the bearing capacity of the frame supports. The paper considers a method for calculating the support pressure and the displacement of the support crown. The calculation method is based on the interaction of the system of blocks “support – filling layer - broken rock layer - undisturbed rock”. The following factors were taken into account in the method of calculating the frame arch support: depth of the roadway development, mine working cross-section, the support section, the width of the filling layer and its deformation characteristics, as well as the deformation and strength characteristics of the rock mass. Checking of the support strength state is done by comparing the calculated load versus the rated bearing capacity of the support. The developed technique allows making the choice of support in various mining conditions of the application.
Highlights
The intensification of mining operations at the underground mines of JSC SUEK-Kuzbass requires timely development of replacement production faces as well as ensuring the fire protection of the workings driven in coal, and the stability of the workings driven in difficult geological conditions
Experimental studies of the load-bearing capacity of the support with the use of contact grouting are given in many works and show its effectiveness [8–12] compared to the backfill
We find the support crown displacement: m
Summary
The intensification of mining operations at the underground mines of JSC SUEK-Kuzbass requires timely development of replacement production faces as well as ensuring the fire protection of the workings driven in coal, and the stability of the workings driven in difficult geological conditions. The creation of an insulating layer between the coal mass and the support increases the fire resistance of the workings. The application of such technology is difficult, in particular, due to the lack of an available methodology for calculating the parameters of the frame support with the contact grouting. The procedure for selecting section dimensions and calculating support parameters for a particular mine working is as follows: a) the dimensions of the calculated finished section of a working are chosen, taking into account the requirements for various conditions; b) the dimensions of the rock section are determined approximately, taking into account the support thickness and pliability and the thickness of the filling material; c) the expected rock displacements are calculated differentially in the roof, side walls and floor of the working, taking into account the mining factors; d) in accordance with the maximum displacements of the rock along the boundaries of the working, the standard and calculated loads on the support are determined, its type and design are chosen, and the installation density is calculated taking into account the support resistance
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