Method of predicting the stress-strain state of interchamber pillars lined with a compliant rope fastener

The method of compliant fixing of inter-compartment pillars in the rocks prone to the exhibiting of rheological properties is presented in this article. The method of forecasting the deformations of anchored pillars is developed using the example of the development system of the tenth western panel of the AB formation, Verkhnekamskoe deposit of potassiummagnesium salts. Numerical realization of the model is performed by the finite element method in the software package Simulia Abaqus with the use of visco-elastic-plastic geomechanical model of sylvinite. Parametric support for the rheological model was made on the basis of the results of measurements of horizontal displacements of contour benchmarks interchamber pillars. The forecast was carried out for a period of 150 years after the chambers were fully developed. It has been established that the value of horizontal displacement of lateral surface of unlined interchamber pillars is equal to 123 mm for the forecast period. A comparative analysis of wire rope fastening operation with different rope diameters and fastener reaction values in the undercut mode of operation has been carried out. The exponential character of dependence between the duration of underlay and rigid regime of the roof support and the criterion of its effective work was revealed. It is evident from the presented data that the increase of the fastener efficiency increases with the use of a larger diameter rope, but the choice of the maximum rope diameter is limited by the design features of the fastener. The equation of dependence of horizontal displacements of the side surface of the anchored pillar on time and fastener reaction is given in the work. The forecast of the stress-strain state of the anchored pillars showed a positive effect of the supple support to increase the bearing capacity of the pillar both during its operation and after its destruction.

Belikov A. A., Belyakov N. A. Method of predicting the stress-strain state of interchamber pillars lined with a compliant rope fastener. MIAB. Mining Inf. Anal. Bull. 2023;(4):20–34. [In Russ]. DOI: 10.25018/0236_1493_2023_4_0_20.

A.A. Belikov¹, Graduate Student, e-mail: s205046@stud.spmi.ru, ORCID ID: 0000-0001-5051-0680,
N.A. Belyakov¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Belyakov_NA@pers.spmi.ru, ORCID ID: 0000-0002-9754-501X,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

A.A. Belikov, e-mail: s205046@stud.spmi.ru.

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