FEATURES SOLUTIONS FOR PROBLEMS OF GEOMECHANICAL WATERY GAS-SATURATED ROCK MASSIF

Details

Parent Category: Geo-Technical Mechanics, 2014

Category: Geo-Technical Mechanics, 2014, Issue 115

UDC  622.831.312

Authors:

E.A.Slashchevа, Ph.D. (Tech.), Senior Researcher,

I.N.Slashchev, Ph.D. (Tech.), Senior Researcher,

A.A. Yalanskiy, D.Sc. (Tech.), Senior Researcher

(IGTM NAS of Ukraine)

Abstract.

Computer simulation is the most preferable and effective method for determining parameters of the mining technology. However, it is difficult to predict reliably a stress-strain state of the watered and gas-saturated rock massif due to usage of existing overly idealized models and generalized empirical dependences, which often lead to incorrect results and, as a rule, are not confirmed by measurements in the mine workings.

The article presents a specific methodology for solving the problems relating to the assessment of geomechanical, hydrogeological and gas states of the rock massif and predicting migration routes of the water and gas flows.

The authors propose: to use an elastoplastic model of the rock massif in view of its failure; to determine orientation of the main crack systems basing on identification of the massif layering and natural structural defects of the massif; to calculate gas pressure by taking into account a moment when the rock massif starts to failure under the action of the rock pressure and basing on additional new re- calculation of the bond breakage in the elements of the model under the impact of a gas component which acts uniformly in all directions in the failure zone in accordance with the Pascal's law; to determine impact of the water saturation by assigning the hydrostatic forces which are summed by each element of the design scheme, as well as by reduced strength parameters of the clay rocks by the established dependence.

The mathematical modeling principles of failure processes in the watered and gas-saturated rock massif were implemented in functions of the new software system "GEO-RS", which was designed by the M.S. Polyakov Institute of Geotechnical Mechanics, NAS of Ukraine.

Keywords:

computer simulation, methodology for solving problems, stress-strain state, water saturation, gas-saturation, rock massif.

References:

1. Bilokopytova, N.A., Synakh, V.YU., Tokar, M.V. and Podvigina, O.O. (2003) “Osoblyvosti modelyuvannya hidroheolohichnykh umov Donbasu“, Zbirnyk naukovykh prats UkrDHRI, no. 2, pp. 59-62, UA.

2. Zvyagilskiy, Ye.L, Bokiy, B.V. and Nazimko, V.V. (2005) Issledovaniye protsessa pereraspredeleniya metana v okrestnosti dvizhushchegosya ochistnogo zaboya [Investigation of the process of redistribution of methane in the vicinity of moving longwall], Nord-Press, Donetsk, UA.

3. Babiyuk, G.V. (2005), Sistemnoye obosnovaniye i razrabotka adaptivnykh sposobov nadezhnosti gornykh vyrabotok [System justification and development of adaptive methods of mine workings reliability], Doctor of Technical Sciences dissertation, Mine and Underground Construction, National Mining University, Dnepropetrovsk, UA.

4. Slaschev, I.N. (2013) “The use of information technology to increase the efficiency and safety of mining operations”, Coal of Ukraine, vol. 2, pp. 40-43, UA.

5. Zienkiewicz, О.С. (1971) Тhе Finite Element Method in Engineering Science, McGraw-Hill, New York.

6. Slashcheva, Ye.A. (2007), The elaboration of the methodic for the express-estimation the stress-strained state of rock mass around the geotechnical installation, Ph.D. dissertation, Physical processes of mining, M.S. Poljakov Institute of Geotechnical Mechanics under the NAS of Ukraine, Dnepropetrovsk, UA.

7. Kirnichanskiy, G.T. (1979), Issledovaniye i razrabotka metodov opredeleniya svoystv gornykh porod i matematicheskogo modelirovaniya kak osnov prognozirovaniya ustoychivosti vyrabotok [Research and development of methods for determining the properties of rocks and mathematical modeling as foundations for predicting of workings stability], Ph.D. dissertation, Mechanics of Granular Bodies Grounds and Rocks, Institute of Geotechnical Mechanics under the NAS of Ukraine, Dnepropetrovsk, UA.

8. Slashchev, I.N. (2010), “Method of account the excess gas pressure when solving geomechanical problems using modern computer technologies”, Geo-Technical Mechanics, no. 88, pp. 112-118, UA.

About the authors:

Slashchevа Yelena Anatolyevna, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Slashchev Igor Nikolaevich, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Yalanskiy Anatoliy Aleksandrovich, Doctor of Technical Sciences (D.Sc.), Senior Researcher, Principal Researcher in Rock Mechanics Department, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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