Numerical research of effect of stress–strain changes on stability of gas drainage wells in coal–rock mass

The article presents the studies on the effect exerted by high-rate mining of gasbearing coal seams in difficult geological conditions on gas drainage performance in longwalls. The data of mine observations confirm an increase in local gas release from coal–rock mass due to the rise in the reservoir characteristics of rocks under impact of swelling. It is shown that swelling processes also substantially affect stability of gas drainage wells, primarily at intersections of the wells with the layers of weak water-saturated rocks. From the field observations, it is concluded on the necessity of taking into account this influence in the evaluation of gas drainage wells. The article describes the circuit of computer-aided modeling of the stress–strain changes in stratified coal–rock mass with a gas drainage well at different positions of longwall face. The numerical experiments using the finite element method and PLAXIS software application are carried out for the conditions of Kirov Mine, SUEK-Kuzbass. The nonlinear behavior of coal–rock mass deformation is depicted using the Mohr–Coulomb elastoplastic model. The justification is provided for the expedience of correction of gas drainage patterns for coal longwalls which occur in the similar mining conditions as in the presented research.

Blokhin D. I., Zakorshmenniy I. M., Kubrin S. S., Kobylkin A. S., Pozdeev E. E., Pushilin A. N. Numerical research of effect of stress–strain changes on stability of gas drainage wells in coal–rock mass. MIAB. Mining Inf. Anal. Bull. 2023;(11):17-32. [In Russ]. DOI: 10.25018/0236_1493_2023_11_0_17.

D.I. Blokhin¹, Cand. Sci. (Eng.), Senior Researcher, e-mail: dblokhin@yandex.ru, ORCID ID: 0000-0002-4652-661X,
I.M. Zakorshmenniy¹, Dr. Sci. (Eng.), Leading Researcher, e-mail: iosif-54@mail.ru, ORCID ID: 0000-0001-9153-673X,
S.S. Kubrin¹, Dr. Sci. (Eng.), Head of Laboratory, e-mail: s_kubrin@mail.ru, ORCID ID: 0000-0002-0490-9065,
A.S. Kobylkin¹, Cand. Sci. (Eng.), Senior Researcher, e-mail: aleksandr@kobylkin.ru, ORCID ID: 0000-0002-1512-890X,
E.E. Pozdeev, Head of Division, Department for Digitalization and Automation of the Coal Division, LLC Digital Technologies and Platforms, 115054, Moscow, Russia, e-mail: pozdeevee@suek.ru,
A.N. Pushilin, Senior Researcher, Gersevanov Research Institute of Bases and Underground Structures JSC Research Center of Construction, 109428, Moscow, Russia, e-mail: apushilin@yandex.ru,
¹ Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia.

D.I. Blokhin, e-mail: dblokhin@yandex.ru.

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