Authors: V.D. Kantemirov, R.S. Titov, A.M. Yakovlev

Title of the article: Implementation of methods for justifying rational compositions of hardening mixtures for underground mining workings

Year: 2023, Issue: 3, Pages: 100-112

Branch of knowledge: 2.8.8 Geotechnology, mining machines

Index UDK: 622.822.33

DOI: 10.26730/1999-4125-2023-3-100-112

Abstract: Relevance. The use of hardening mixtures in underground mining is a necessary condition for increasing the efficiency of mining operations, improving working conditions and safety, and preserving the earth's surface. The development of methods for justifying the compositions of hardening mixtures using mining waste is particularly relevant for complex mining and geological conditions. Objective. This work is devoted to the development of methods for creating hardening mixtures based on mining waste and tailings for underground mining of the Yarega oil-titanium deposit in the Komi Republic. Methodology. The requirements for hardening mixtures are largely determined by the conditions and technologies of underground mining, as well as the methods of transporting and laying the hardening material in the mined-out space. The properties of hardening mixtures are characterized by physical, mechanical, granulometric, and rheological parameters. The main characteristics of the hardening mass are strength and the dynamics of strength gain. The calculated normative strength of the hardening mass for the Yarega deposit, depending on the depth of mining and the parameters of the adopted mining system, ranges from 3.51 to 9.65 MPa. The composition of the hardening mixture based on cement binder is calculated using the method adopted for calculating concrete mixtures: the cement-water (C/W) or water-cement (W/C) ratio is determined, followed by the water and cement consumption, and then the consumption of coarse and fine fillers per 1 m3 of the mixture is determined. The article presents the methodology, calculation results, and test results of the component composition of the hardening mixture. Results. The compositions (recipes) of the hardening mixture based on tailings and waste rocks of the Yarega oil-titanium deposit are justified. Based on laboratory-analytical studies, two compositions of the hardening mixture for current mining and geological conditions of the Yarega deposit and for the near future are proposed. One composition with increased strength of 5.13 MPa is intended for the construction of a protective layer (roof and soil of the hardening mass) of underground workings, and the second composition with a strength of 3.62 MPa is intended for the construction of the main artificial mass.

Key words: filling of mined-out space hardening mixture flotation tailings strength of filling mobility of the mixture components of the hardening mixture

Receiving date: 12.04.2023

Approval date: 15.06.2023

Publication date: 30.06.2023

CITE DOWNLOAD