A CASE STUDY OF LONGWALL GATEROAD FLOOR HEAVE

International Journal of Civil Engineering and Technology (IJCIET) Volume 10, Issue 03, March 2019, pp. 3220–3226, Article ID: IJCIET_10_03_323 Available online at http://www.iaeme.com/ijmet/issues.asp?JType=IJCIET&VType=10&IType=3 ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication Scopus Indexed A CASE STUDY OF LONGWALL GATEROAD FLOOR HEAVE Alexander Alekseyevich Nosov Ph.D. Candidate, Department of Mining of Mineral Deposits, Saint-Petersburg Mining University, Russian Federation, 199106, Saint-Petersburg, Vasilievski ostrov, 21 linia, 2 Pavel Nikolaevich Dmitriyev Ph.D., Associate Professor, Department of Mining of Mineral Deposits, Saint-Petersburg Mining University, Russian Federation, 199106, Saint-Petersburg, Vasilievski ostrov, 21 linia, 2 Andrey Vladimirovich Pasynkov Ph.D., Associate Professor, Department of Productions Safety, Saint-Petersburg Mining University, Russian Federation, 199106, Saint-Petersburg, Vasilievski ostrov, 21 linia, 2 ABSTRACT The main objective of researches was establishment of the reasons of a floor heave and failure of gateroad during the mining of Polenovsky seam in the mine of S.M. Kirov in the Kuznetsk coal basin. In paper results of measurement of floor heave, rooflowering and convergence of ribs are presented. Relationships of a floor heave and the location of a longwall face are shown. The defining influence of depth and high rock pressure zones from the interpanel pillars left on overlying Boldyrevsky seam is established. Recommendations about a floor heave exception in the geological and mining conditions of the mine of S.M. Kirov are made. Key words: longwall mining, gate road stability, floor heave, bearing pressure, multiple seams, high stress zone, monitoring stations Cite this Article: Alexander Alekseyevich Nosov, Pavel Nikolaevich Dmitriyev, Andrey Vladimirovich Pasynkov, A Case Study of Longwall Gateroad Floor Heave, International Journal of Civil Engineering and Technology 10(3), 2019, pp. 3220– 3226. http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=10&IType=3 1. INTRODUCTION The main method of underground coal mining in Russia is longwall mining. There is a large number of the mining, geological and organizational factors capable to lead to equipment downtimes of longwalls [1-24]. One of the major factors defining overall performance of longwalls is the state of longwall gateroads. Significant effect the mining depth, properties of a roof rock and the floor, the layout of protection of entry and a type of a roof support has on http://www.iaeme.com/IJCIET/index.asp 3220 [email protected] A Case Study of Longwall Gateroad Floor Heave a state of entries. Application of longwall mining with leaving of wide interpanel pillars (30 m and more) provides favorable conditions for roadway maintenance due to minimization of influence of bearing pressure of the adjacent longwall panel and allows to use the roof bolting in longwall gateroads. The complexity of ensuring stability of entries usually increases with increase in a mining depth. However, in certain cases there is a failure of entry during the work at depths up to 400 m. So in 2012-2013 when mining flat Polysayevsky seam on the mine of S.M. Kirov in the Kuznetsk coal basin there was a failure of longwall gateroads on longwall panels 25-92 and 25-93 caused by failure of a roof and a floor heave. As a result of failure of a part of a longwall gateroad, considerable on extent, it was required to undergo the third parallel entry and to reduce the panel width of the following longwall panel 25-94. The situation has repeated when mining a longwall panel 25-94. The economic disbenefit connected with need of drivage additional entry and it was about 1.6 million US dollars when mining a longwall panel 25-93 and 2.1 million US dollars when mining a longwall panel 2594. Also when driving additional entry the coal pillar has been left and panel width is reduced that has led to loss of the developed reserves of 240 thousand tons. Considering that when mining other longwall panels in the mine (both earlier, and later) problems with roadway maintenance were not observed, studying of causes of destruction of entries, is of practical interest to an exception of repetition of such cases. It should be noted that the large number of scientists [25-34] was engaged in issues of studying of influence of various geological and mining factors on stability of entries, at the same time the greatest number of works is connected with holding numerical researches [3139]. However, mine measurements and observations of a state of longwall gateroads which allow to understand the mechanism of geomechanical processes in the rock massif better are of considerable interest. 2. METHODS For researches of influence of various geological and mining factors mine measurements have been executed. For measurement of closure of a roof, heave of floor, convergence of rib under the influence of rock pressure in development opening 13 monitoring stations (figure 1) have been equipped, each of which consisted of four planimetric reference points fixed in spurs. For installation of a reference point the spur of 0.5 m in depth was drilled, the wooden stopper 0.45 m long was hammered into the spur, the metal rod 0.55 m long is hammered into a stopper. On the end of a rod the hook for fixing of a tape measure, or a site with risky has been welded when using an optical range finder. Figure 1 Measurements scheme http://www.iaeme.com/IJCIET/index.asp 3221 [email protected] Alexander Alekseyevich Nosov, Pavel Nikolaevich Dmitriyev, Andrey Vladimirovich Pasynkov For measurement of convergence of the roof and the floor between side reference points thread (string) stretches. From thread the tape measure, a metal ruler or an optical range finder measure distance to the reference point established in a roof or the floor of entry. At the following cycles of observations thread between side reference points stretches again and distances to a reference point are measured. 3. RESULTS AND DISCUSSION Monitoring stations have allowed to fix change of convergence of sides of the entry protected by a coal pillar during all term of mining of the longwall panel 25-94. Figure 2 shows the floor heave measured at various stations in process of coal face advance. The floor heave began to develop at distance of 60-80 m from a longwall face and continued to increase to withdrawal of a longwall face approximately by 300 m (within 30-40 days) then floor heave speed significantly decreased. Figure 2 Influence of the bearing pressure on the floor heave Measurements have established change of the maximum size of a floor heave of entry on its length (figure 3). The greatest floor heave of entry was observed regarding the longwall gateroad which is at distance of 500-1300 m from the setup room where it reached 250-500 mm. After as the longwall has passed the specified zone a floor heave in a bearing pressure zone did not exceed 120 mm. Figure 3 Chart of change of the floor heave longwise longwall panel http://www.iaeme.com/IJCIET/index.asp 3222 [email protected] A Case Study of Longwall Gateroad Floor Heave The analysis of conditions of mining operations has shown that in the investigation of a difficult hypsometry of seam the site of entry on which the greatest floor heave has been established corresponded to the maximum mining depth (375-405 m). However, earlier when mining longwall panels depth already reached and even exceeded 400 m, but the state of the longwall gateroads protected by coal pillars remained stable. Also there was stable a state of entries when mining the subsequent longwall panels 25-95 and 25-96. Figure 4 The relation between the floor heave and the depth of the gateroad Mining of longwall panels 25-95 and 25-96 with ensuring stability of the longwall gateroads protected by a coal pillar has allowed to draw a conclusion on causes of destruction of entries when mining longwall panels 25-93 and 25-94. Figure 5 shows the layout of conducting mining operations and location of pressure zones (borders of a zone are allocated with red dashed lines) which were formed as a result of action of the pillars created after mining of longwall panels on Boldyrevsky seam. Figure 5 Mining operations plan Boldyrevsky seam deposits 43 m above Polenovsky seam. At location of the longwall gateroads protected by interpanel pillars, on longwall panels 25-93 and 25-94 in zones of the increased tension when approaching a longwall failure of imposing of a bearing pressure zone of a longwall and a zone of the increased stress resulted from them. Thus, when approaching a longwall of stress in a bearing pressure zone by 3-4 times exceeded geostatic pressure level that led to a floor heave. As the subsequent mining of longwall panels 25-95 and 25-96 was http://www.iaeme.com/IJCIET/index.asp 3223 [email protected] Alexander Alekseyevich Nosov, Pavel Nikolaevich Dmitriyev, Andrey Vladimirovich Pasynkov carried out at the increased panel width (from 240 m to 270 m), longwall gateroads have appeared outside a zone of the increased pressure and stress concentration has considerably decreased. Besides, at increase in panel width width of an interpanel pillar has also been increased (from 25 m to 35 m). Thus, location of longwall gateroads outside a zone of the increased tension has provided their stability in a zone of influence of bearing pressure of a longwall. It should be noted that on significant influence of a zone of the increased tension other researchers already specified in the scientific works [35-39]. 4. CONCLUSIONS As a result of mine measurements influence on the level of a floor heave of entry of a mining depth, bearing pressure of a longwall and high rock pressure zone is established significantly. Separate influence of the specified factors does not break stability of entries, and joint leads to development of a floor heave, convergence of sides, roof subsidence and final fracture of entry. For the considered mining-and-geological conditions of the mine of S.M. Kirov the ultimate depth of conducting mining operations on which joint influence of the specified factors constitutes danger to longwall gateroads is 370 m. At smaller depths of failure of entries did not occur. In the considered geological conditions for ensuring stability of longwall gateroads at depths more than 370 m it is necessary to have them outside zones of the increased tension from the pillars created when mining of the above-located Boldyrevsky seam. Thus, zones of the increased stress can contribute to the development of a floor heave of seams at depths less than 400 m. REFERENCES [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] Sidorenko, S.A., Ivanov, V.V. (2017) Improving the efficiency underground mining of coal beds in difficult mining and geological conditions. ARPN Journal of Engineering and Applied Sciences. Vol. 12, No. 3, February 2017, pp.882-888. Sidorenko, S.A., Panchenko, I.A. (2015) Substantiation of parameters of the technology of mining thick flat beds by underground method with splitting the bed into two. Biosciences Biotechnology Research Asia. Vol. 12Issue 3, 2015, pp.2911-2919. Gabov, V.V., Zadkov, D.A. (2017) Peculiarities of stress field formation during cutting isotropic material by mining machine cutters / IOP Conf. Series: Earth and Environmental Science , № 87, Т 22007, 2017. pp. 1-6. DOI:10.1088/1755-1315/87/2/022007. Buevich, V.V., Gabov, V.V., Zadkov, D.A., Vasileva, P.A. (2015) Adaptation of the mechanized roof support to changeable rock pressure. Eurasian mining. Vol.2, 2015. pp.11-14. DOI: 10.17580/em.2015.02.03. Kazanin, O.I., Drebenstedt, C. (2017) Mining Education in the 21st Century: Global Challenges and Prospects. Zapiski Gornogo instituta. 2017. Vol. 225, p. 369-375. DOI: 10.18454/PMI.2017.3.369. Magomet, R.D., Mironenkova, N.A. (2016) Methane problem of coal beds Research Journal of Pharmaceutical, Biological and Chemical Sciences. 7(3). pp. 2276-2284. Magomet, R.D., Mironenkova, N.A. (2015) The impact of anthropogenic activities on the indicators of environmental pollution. Biosciences Biotechnology Research Asia. 12(1): 7-14. Koptev, V. Yu., Kopteva, A.V. (2016) Mining business transportation system structure optimization. Vol. 11, 2016. pp. 7402-7405 Koptev, V. Yu., Kopteva, A.V. (2016) Mining business transportation system structure optimization International Journal of Applied Engineering Research. 11. pp. 7402- 7405. Ivanov, S.L., Shishkin, P.V. (2017) Integral criterion of mining machines technical condition level at their operation/ IOP Conference Series: Earth and Environmental http://www.iaeme.com/IJCIET/index.asp 3224 [email protected] A Case Study of Longwall Gateroad Floor Heave [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] Science, Vol. 87 (2017) 022009, Mining machines, pp. 1-5. DOI :10.1088/17551315/87/2/022009. Mironenkova, N.A., Magomet, R.D. (2017). Hygienic assessment of working conditions on a radiation-hazardous factor in mines. Ecology, Environment and Conservation. 23. 1017-1021. Magomet, R.D., Seregin, A.S. (2017) Enhancement of pre-mining methane drainage efficiency. Gornyi Zhurnal. pp.92-95. DOI:10.17580/gzh.2017.07.18 Shishkin, P.V., Trufanova, I.S. (2017) Mathematical model of device for slurry concentration and desludging in near-bottom zone/ IOP Conference Series: Earth and Environmental Science, Volume 87(2017) 022019, Mining machines, pp. 1-5. doi :10.1088/1755-1315/87/2/022019. Ivanov, S.L., Shishkin, P.V. (2018) Manufacturing and Design Technology of Combined Corrected Gearing and Non-Standard Radial Clearance/ Earth and Environmental Science, Volume 194(2018) 022013, Mechanical engineering, pp. 1-5. doi:10.1088/17551315/194/2/022013. Shishkin, E.V., Shishkin, P.V. (2017) Process duty effect on the vibration gyratory-cone crusher dynamics/Journal of Industrial Pollution Control, 2017, Vol. 33(1), p. 909-913. Nikolaichuk, L.A., Malyshkov, G.B., Sergeev, I.B. Integration of economic aspects into the teaching system for disciplines in the field of natural resource management and environmental protection. International Journal of Applied Engineering Research ISSN 0973-4562 Volume 12, Number 6 (2017) pp. 928-931. http://www.ripublication.com/Volume/ijaerv12n6.htm Nikolaichuk, L.A., Tsvetkov, P.S. Prospects of ecological technologies development in the Russian oil industry. International Journal of Applied Engineering Research ISSN 0973-4562 Volume 11, Number 7 (2016), pp 5271-5276. http://www.ripublication.com/ijaer16/ijaerv11n7_99.pdf Soloviov, V.B., Magomet, R.D. (2017) The ways of safety improvement during the outburst-prone and gas-bearing coal seams development. Journal of Industrial Pollution Control. 33(1). pp. 1042-1047. Cherepovitsyn, A., Ilinova, A. Ecological, economic and social issues of implementing carbon dioxide sequestration technologies in the oil and gas industry in Russia (2016) Journal of Ecological Engineering, 17 (2), pp. 19-23. DOI: 10.12911/22998993/62281 Tcvetkov, P., Cherepovitsyn, A. Prospects of CCS projects implementation in Russia: Environmental protection and economic opportunities (2016) Journal of Ecological Engineering, 17 (2), pp. 24-32. DOI: 10.12911/22998993/62282 Koptev, V. Yu., Kopteva, A.V. (2017) Developing an Ecological Passport for an Open-Pit Dump Truck to Reduce Negative Effect on Environment. IOP Conference Series: Earth and Environmental Science, vol. 66, 2017. DOI: 10.1088/1755-1315/66/1/012009. Koptev, V. Yu., Kopteva, A.V. (2017) Improving paraffin deposits detection methodology for better ecological safety during hydrocarbon transportation. International Journal of Applied Engineering Research. Vol. 12, 2017. 618-621 Zhukovskiy, Y.L., Koteleva, N.I., Kovalchuk, M.S. (2019) Development of course feedback questionnaires of continuing professional education in the mining industry. Innovation-Based Development of the Mineral Resources Sector: Challenges and Prospects - 11th conference of the Russian-German Raw Materials, 2018, 589-597 Zhukovskiy, Y., Korolev, N. & Koteleva, N. (2018) About increasing informativity of diagnostic system of asynchronous electric motor by extracting additional information from values of consumed current parameter", Journal of Physics: Conference Series. Volume 1015, Issue 3, 22 May 2018, 032158. Trushko, O.V., Potemkin, D.A., Popov, M.G. (2018) Ensuring sustainability of mining workings in development of ore deposits in complex geological conditions. ARPN Journal http://www.iaeme.com/IJCIET/index.asp 3225 [email protected] Alexander Alekseyevich Nosov, Pavel Nikolaevich Dmitriyev, Andrey Vladimirovich Pasynkov [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] of Engineering and Applied Sciences (ARPN J. Eng. Appl. Sci.), 13 (7), 2018, pp. 25942601. Potyomkin, D.A., Trushko, V.L., Trushko, O.V. (2018) The stress-strain behaviour of the protective pillars of a subarrier zone using the ore deposits mining combined system. International Journal of Mechanical Engineering and Technology (Int. J. Mech. Eng. Technol.), 9 (3), 2018, pp. 1046-1052. Trushko, V.L., Protosenya, A.G., Trushko, O.V. (2018) Stress-strain behavior of the workings during the rich iron ores development under the confined aquifers. International Journal of Applied Engineering Research (Int. J. Appl. Eng. Res.), 11 (23), 2016, pp. 11153-11164. Sidorov, D.V., Ponomarenko, T.V., Larichkin, F.D., Vorobiev, G. (2018) Economic justification of innovative solutions on loss reduction in the aluminium sector of Russia. Gornyi Zhurnal, (6), pp. 65-68. DOI: 10.17580/gzh.2018.06.14. Sidorov, D., Ponomarenko, T. (2017) The development of a software suite for predicting rock bursts within the framework of a system for ensuring geodinamic safety of mining operations. International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM, 17 (22), pp. 633-638. DOI: 10.5593/sgem2017/22/S09.079. Fiunkov, A.A., Sidorov, D.V., Bodrov, A.E., Lamzin, A.N., Urusov, V.I. (2004) Estimation of discharge efficiency for rock massif with large diameter holes. Gornyi Zhurnal, (12), pp. 49-51. Sidorenko A.A., Ivanov V.V., Sidorenko S.A. (2019) Numerical simulation of rock massif stress state at normal fault at underground longwall coal mining. International Journal of Civil Engineering and Technology (IJCIET) Volume 10, Issue 01, January 2019, pp. 844– 851. Kazanin O.I., Klimov V.V., Alekseev V.Y., Sidorenko A.A. (2019) Improvement of a longwall recovery room erection technology. International Journal of Civil Engineering and Technology (IJCIET) Volume 10, Issue 02, February 2019, pp. 1148–1153. Kazanin O.I., Sidorenko A.A., Sirenko Y.G. (2019) Analysis of the methods of calculating the main roof caving increment in mining shallow coal seams with long breaking faces. ARPN Journal of Engineering and Applied Sciences. VOL. 14, NO. 3, February 2019. pp.732-736. Kazanin, O.I., Mustafin, M.G., Meshkov, A.A., Sidorenko, A.A. (2015) Determination of parameters of intensive flat coal seams mining technology in the conditions of negative effect of mining operations on the daily surface. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (2), pp. 51-56. Sidorenko, A.A., Ivanov, V.V. (2016) Underground mining of multiple seam of coal. ARPN Journal of Engineering and Applied Sciences, 11 (7), pp. 4448-4454. Kovalsk, E.R., Karpov, G.N., & Leisle, A.V. (2018). Investigation of underground entries deformation mechanisms within zones of high stresses. International Journal of Civil Engineering and Technology, 9(6), 534-543. Sidorenko, A.A., Sishchuk, J.M. (2016) Stability of undermining seam panel entries at retreating longwall multiple mining. Research Journal of Pharmaceutical, Biological and Chemical Sciences, 7 (2), pp. 927-935. Sidorenko, A.A., Gerasimova, I.G. (2016) Determination of parameters of high stress zones at multiple-seam longwall mining. Research Journal of Pharmaceutical, Biological and Chemical Sciences, 7 (3), pp. 1844-1851. Sidorenko, A.A., Sishchuk, J.M., Gerasimova, I.G. (2016) Underground mining of multiple coal seams: Problems and solutions. Eurasian Mining, (2), pp. 11-15. DOI: 10.17580/em.2016.02.03. http://www.iaeme.com/IJCIET/index.asp 3226 [email protected]