N. A. Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia:

Kondratenko A. S., Director, Candidate of Engineering Sciences, kondratenko@misd.ru
Neverov S. A., Head of Laboratory, Leading Researcher, Candidate of Engineering Sciences
Neverov A. A., Leading Researcher, Candidate of Engineering Sciences

SUEK-Kuzbass, Leninsk-Kiznetsky, Russia:

Kharitonov I. L., Head of Engineering Office

In terms of the mining conditions in longwall No. 52-13 in coal seam 52 in the Yalevsky Mine, the integrated research aimed at geomechanical assessment of rock mass stability around a teardown room is carried out. The stress–strain analysis of the geotechnical structure in the extraction panel was implemented by 3D finite element-based modeling. Owing to this, the geological conditions of the coal occurrence and the structural complexity of geotechnical objects were taken into account to the maximum extent in the calculations, which allowed near-reality results qualitatively and quantitatively consistent with in-situ data. The forecast maps of stress distribution in the elements of the mining system in the extraction panel are obtained with regard to the earlier mined-out areas, using the gravitational model of the geomedium. The localities and sizes of the post-limiting deformation zones (possible instability zones) are determined in coal-and-rock mass around underground excavations. It is found that safety of the teardown room and the adjacent drainage and ventilation drives is mostly governed by the poor quality and jointing of the coal-and-rock mass. The predictive estimate of the rock mass stability provides a complete idea on the mechanism of deformation and failure of rocks in the structural elements of the analyzed drive, which enables reasoned design of the support system for the teardown room, as well as the drainage and ventilation drives while combining safety and efficiency of removal of the powered roof support units.

1. Konurin A. I., Neverov S. A., Neverov A. A., Konurina M. I. 3D geomechanical parametrization of mineral deposit as framework for the selection of mining technology. Geosciences. State-of-the-Art : V All-Russian Youth Scientific–Practical Conference Proceedings. Novosibirsk : IPTs NGU, 2018. pp. 41-43.
2. Seryakov V. M. Mathematical modeling of stress–strain state in rock mass during mining with backfill. Journal of Mining Science. 2014. Vol. 50, No. 5. pp. 847–854.
3. Freidin A. M., Neverov S. A., Neverov A. A. Identification of tectonic types of rock masses and its application. Gornyi zhurnal Kazakhstana. 2013. No. 5. pp. 20–28.
4. Makarov A. B. Practical geomechanics : Manual for mining engineers. Moscow : Gornaya kniga, 2006. 391 p.
5. Zoteev O. V. Geomechanics : Students’ tutorial. Yekaterinburg : UGGU, IGD UrO RAN, 2003. 252 p.
6. Marcak M., Mutke G. Seismic activation of tectonic stresses by mining. Journal of Seismology. 2013. Vol. 17, No 4. pp. 1139–1148.
7. Reiter K., Heidbach O. 3D geomechanical-numerical model of the contemporary crustal stress state in the Alberta Basin (Canada). Solid Earth. 2014. No. 5. pp. 1123–1149.
8. Zienkiewicz O. C. The finite element method in engineering science. London, 1971.
9. Wang J., Wang Y., Cao Q., Ju Y., Mao L. Behavior of microcontacts in rock joints under direct shear creep loading. International Journal of Rock Mechanics and Mining Sciences. 2015. Vol. 78. pp. 217–229.
10. Vanneschi C., Salvini R., Riccucci S., Massa G. 3D geological modelling in support of underground mining industry. Geoitalia 2013. IX Forum di Scienze della Terra. Pisa, Italy. 2013. pp. 107–114.
11. Bin Gong, Chun’an Tang, Shanyong Wang, Hongmei Baic, Yingchun Li. Simulation of the nonlinear mechanical behaviors of jointed rock masses based on the improved discontinuous deformation and displacement method. International Journal of Rock Mechanics and Mining Sciences. 2019. Vol. 122. pp. 787–793.
12. Pakzad R, Wang S. Y., Sloan S. W. Numerical Simulation of Hydraulic Fracturing in Low-/High-Permeability, Quasi-Brittle and Heterogeneous Rocks. Rock mechanics and rock engineering. 2018. Vol. 51. pp. 1153–1171.
13. Kazikaev D. M. Geomechanics of underground ore mining University textbook. Moscow : MGGU, 2005.
14. Freidin A. M., Neverov A. A., Neverov S. A. Geomechanical assessment of compound mining technology with backfilling and caving for thick flat ore bodies. Journal of Mining Science. 2016. Vol. 52. No. 5. pp. 933–942.