NUMERICAL MODELING OF STRESS–STRAIN STATE FOR HOST ROCK MASS AND THICK GENTLY DIPPING COAL SEAM AFTER MINING COMPLETION IN EXTRACTION PANEL

The stress distribution and formation of damage zones at the final stage of mining in an extraction panel are discussed. The behavior of the host rock mass and coal seam is analyzed in the cases when the disassembly chamber is created beforehand and the longwall approaches it gradually, and when the disassembly room is cut by the continuous heading machine directly at the end stage of longwalling. Various alternatives are considered in the problem formulation in terms of either total or additional stresses. The proposed geomechanical model makes it possible to describe mining-induced redistribution of initial stresses; formation of relaxation and additional loading zones nearby longwall faces as well as around the disassembly chamber; displacement of rocks, in particular, vertical displacements in the roof of DC as well as horizontal displacement on vertical exposures in the face and disassembly chamber. The deformation model used in the problem solving is constructed with regard to possible plastic deformation of coal and immediate roof, which enables accounting to a certain degree for rock mass jointing and nonlinear deformation of coal. It is emphasized that plasticity parameters can be found from solution of the inverse problem using the in-situ experiment data. The calculations used the design parameters of geological and geotechnical conditions typical of Baikaim coal seam in the November 7 Mine of SUEK-Kuzbass.


For citation:  Trofimov V. A., Kubrin S. S., Filippov Yu. A., Kharitonov I. L. Numerical modeling of stress–strain state for host rock mass and thick gently dipping coal seam after mining completion in extraction panel. MIAB. Mining Inf. Anal. Bull. 2019;(8):42-56. [In Russ]. DOI: 10.25018/0236-14932019-08-0-42-56. 

Keywords

Numerical modeling, geomechanical model, disassembly chamber, longwall, plasticity, stresses, displacement in rock mass.

Issue number: 8
Year: 2019
ISBN: 0236-1493
UDK: 622.33
DOI: 10.25018/0236-1493-2019-08-0-42-56
Authors: Trofimov V. A., Kubrin S. S., Filippov Yu. A., Kharitonov I. L.

About authors: V.A. Trofimov (1), Dr. Sci. (Eng.), Head of Laboratory, S.S. Kubrin (1), Dr. Sci. (Eng.), Professor, Head of Laboratory, Yu.A. Filippov (1), Cand. Sci. (Eng.), Senior Researcher, I.L. Kharitonov, Head of Technical Department, 1) SUEK-Kuzbass JSC, 652507, Leninsk-Kuznetskiy, Russia. Corresponding author: V.A. Trofimov, e-mail: asas_2001@ mail.ru.

REFERENCES:

1. Kumar A., Waclawik P., Singh R., Ram S., Korbe J. Performance of a coal pillar at deeper cover: Field and simulation studies. International journal of rock mechanics and mining sciences. 2019. Vol. 113. Pp. 322—332.

2. Basarir H., Sun Y. Y., Li G. C. Gateway stability analysis by global-local modeling approach. International journal of rock mechanics and mining sciences. 2019. Vol. 113. Pp. 31—40.

3. Liang Wanga B., Yuan-ping Cheng A. N., Chun-gui Ge B., Jia-xiang Chen B., Wei Li A., Hongxing Zhou A., Wang Hai-feng. Safety technologies for the excavation of coal and gas outburstprone coal seams in deep shafts. International journal of rock mechanics and mining sciences. 2013. Vol. 57. Pp. 24—33.

4. Ju Y., Wang Y. L., Su C. S., Zhang D. S., Ren Z. Y. Numerical analysis of the dynamic evolution of mining-induced stresses and fractures in multilayered rock strata using continuum-based discrete element methods. International journal of rock mechanics and mining sciences. 2019. Vol. 113. Pp. 191—210.

5. Hehua Zhua B., Qi Zhangc., Boqi Huanga B., Lianyang Zhangd A constitutive model based on the modified generalized three-dimensional Hoek—Brown strength criterion. International journal of rock mechanics and mining sciences. 2017. Vol. 98. Pp. 78—87.

6. Kharitonov I. L., Remezov A. V. Исследование опорного давления при подвигании очистного забоя пологих угольных пластов на ранее пройденные выработки. Gornyy informatsionno-analiticheskiy byulleten’. 2016, no 4, pp. 292—299. [In Russ].

7. Remezov A. V., Kostinets I. K., Kharitonov I. L. Gornoe davlenie. Ego proyavleniya pri vedenii gornykh rabot v massive gornykh porod [Mining pressure. Its manifestations in the conduct of mining operations in the rock mass], Kemerovo, 2013, 681 p.

8. Kharitonov I. L., Remezov A. V. Investigation of the reference pressure when moving the stope of flat coal seams to the previously completed workings. Vestnik Kuzbasskogo gosudarstvennogo tekhnicheskogo universiteta. 2016, no 2, pp. 47—55. [In Russ].

9. Nikol'skiy A. M., Neverov A. A., Neverov S. A., Shinkevich M. V. Assessment of the stress state of the rock mass at the approach of lava to the demolition chamber. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2008, no 5(69), pp. 23—27. [In Russ].

10. Zhdankin A. A., Zhdankin N. A. Spatial stress-strain state of the massif in the area of conjugation of excavation drifts with lava. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 1985, no 4. [In Russ].

11. Katkov G. A., Zhurilo A. A. On the mechanism of formation of rock pressure and the interaction of mechanized roof supports with a hard-to-damage roof. Voprosy gornogo davleniya. 1979, issue 37. [In Russ].

12. Remezov F. V., Novoselov S. V. Theoretical and methodological issues of determining the parameters of the reference pressure in mine workings and the practice of their application. Ugol. 2018, no 6, pp. 21—25. [In Russ].

13. Torro V. O., Remezov A. V., Klimov V. V., Dedikov E. A. Factors for assessing the stability of dismantling chambers during the formation of their clearing face. Vestnik Kuzbasskogo gosudarstvennogo tekhnicheskogo universiteta. 2017, no 6, pp. 47—53. [In Russ].

14. Kravchenko K. V., Babets D. V. Geomekhanicheskie yavleniya pri otrabotke konechnykh uchastkov lav strugovymi kompleksami [Geomechanical phenomena during the development of the final sections of love bands by plow complexes], Dnepropetrovsk, NGU, 2015, 108 p.

15. Trubetskoi K. N., Iofis M. A., Kuznetsov S. V., Trofimov V. A. Basic regularities governing the subsidence of undermined rock strata and deflection of hanging roof at shallow and great depths. Journal of mining science, Consultants Bureau, New York. 1999, vol. 35, no 3, pp. 209—215.

16. Kuznetsov S. V., Trofimov V. A. Method of assessing the stratification of the roof rocks of the extended cleaning development. Trudy konferentsii «Geodinamika i napryazhennoe sostoyanie nedr Zemli». Novosibirsk: IGD SO RAN, 2009. [In Russ].

17. Hoek E. Practical rock engineering. London: Institution of Mining and Metallurgy. 2002. 325 р.

18. Oskar Jacobi. Praxis der Gebirgsbeherrschung. Vertag Gluckauf GmbH, Essen, 1981. 568 p.

19. Knissel W., Linzig H. J. Verlegung der Abbaustrecken drukentlastete Zonen. Steinkohlenbergverk der Zukunft. Essen, Bergbau—Forschung, 1977.

20. Leonhardt J. Vorlaufige Richtlinein zur Anwendung des Prallhammers. Mitt. Aus dem Markscheidewesen, 1965, Bd. 72, pp. 127—139.

21. Trofimov V. A., Kubrin S. S., Filippov Yu. A., Kharitonov I. L. General patterns of coal bed deformation near the demolition chamber when approaching the face of lava. Gornyy informatsionnoanaliticheskiy byulleten’. 2018. Special edition 48. Vol. 1, 464 p. [In Russ].

Subscribe for our dispatch