Abstract
Hydraulic conductivities of rock masses in Tunçbilek lignite basin, western Turkey, were determined by analytical methods and seepage analyses. In situ hydraulic conductivity of lignite, clay-bearing rocks and disturbed rock masses in the basin was determined by utilizing the inversed auger hole method. The hydraulic conductivity values of the lignite and clay-bearing rocks were determined by the field testing to be ranged from 7.88×10−7 to 2.24×10−6 m/s and from 2.49×10−7 to 1.11×10−5 m/s, respectively. Excavation and blasting processes for mining activity eventually caused a significant increase in the fracture frequency. Therefore, hydraulic conductivity values of disturbed/blasted rock masses were measured as two or three order magnitudes higher than those measured on the undisturbed clay-bearing rock masses. To get a further understanding of the hydraulic properties of studied rock masses, seepage analyses were also performed on rock masses left as a pillar between an underground mining gallery and an adjacent abandoned open-pit mining lake. According to the analytical solution based on the Dupuit-Forchheimer approximations, the average hydraulic conductivity value of the pillar consisting mainly of marls, claystone and lignite layer with a variable thickness was calculated as 1.2×10−6 m/s. Seepage analyses were also performed to predict water inflow to the gallery in the case of possible blasting and subsidence-related disturbance problems as well as a rise in the level of the open-pit lake. Based on the results obtained, it can be concluded that subsidence or blasting-induced disturbance of rock masses can cause excessive water inflow into the underground galleries to jeopardize the safety of mining activities.
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Acknowledgements
The authors gratefully acknowledge the financial support of the Turkish National Coal Board (TCB). The authors are also very grateful to field staffs of the Garp Lignite Operations Directorate for their valuable logistical support during field studies. The authors also thank the reviewers for their valuable comments and suggestions which improved the manuscript.
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Karakuş, H., Erguler, Z.A., Ediz, İ.G. et al. Assessment of hydraulic conductivity of disturbed and undisturbed rock masses in Tunçbilek lignite basin, Turkey. Arab J Geosci 14, 1522 (2021). https://doi.org/10.1007/s12517-021-08063-6
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DOI: https://doi.org/10.1007/s12517-021-08063-6