Rockfill trenching for enhancing overburden dump height on weak soil strata

• Autorzy: Shende Rahul , Venkatraman Srinivasan , Pandian Athiveera , Jain Shubham , Patel Anjan

Identyfikatory

DOI

10.46873/2300-3960.1465

• Języki publikacji: EN

Abstrakty

EN

Dumping waste on weak soil layers can destabilize the dump, compromising its capacity for material disposal. This study focuses on the stability of dumps placed over weak black cotton (BC) soil strata in central India, with an emphasis on assessing the effectiveness of rockfill trenches (RFT) in improving dump stability. A combined approach using nine limit equilibrium methods (LEM) and the finite element method (FEM) was employed for analysis. The results demonstrate that dump stability is significantly influenced by the presence of weak strata under both dry and wet conditions when the dumping height isincreased. The study also reveals that the factor of safety (FoS) can be enhanced by strategically placing an RFT near the toe of the dump. RFT width optimization for maximum stability was also carried out for increased dump height to 90 m. Moreover, the spatial arrangement of RFT beneath the dump can reduce displacement by 30–50%. The impact of RFT material properties on both FoS and displacement was examined, considering locally available materials. These findings suggest that careful design of on-site RFT dimensions can lead to substantial improvements in dump stability over weak soil layers.

Słowa kluczowe

EN

overburden dump; slope stability; rock-filled trench; numerical modeling; weak floor

PL

wysypisko nadkładu; stabilność skarpy; wykop wypełniony skałami; modelowanie numeryczne; słaby fundament

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2025
• Tom: Vol. 24, iss. 3
• Strony: 424--435
• Opis fizyczny: Bibliogr. 27 poz.

Twórcy

autor

Shende Rahul

• Civil Department, Visvesvaraya National Institute of Technology, Nagpur 440010, Maharashtra, India

• https://orcid.org/0009-0008-9567-6615

autor

Venkatraman Srinivasan

• Civil Department, Visvesvaraya National Institute of Technology, Nagpur 440010, Maharashtra, India

• https://orcid.org/0000-0003-1752-0523

autor

Pandian Athiveera

• Civil Department, Central Mine Planning & Design Institute Ltd., Ranchi 834004, Jharkhand, India

• https://orcid.org/0009-0002-1661-2872

autor

Jain Shubham

• Civil Department, Visvesvaraya National Institute of Technology, Nagpur 440010, Maharashtra, India

• https://orcid.org/0009-0000-4721-9585

autor

Patel Anjan

• Civil Department, Visvesvaraya National Institute of Technology, Nagpur 440010, Maharashtra, India

• https://orcid.org/0000-0003-2645-613X

Bibliografia

• [1] Mukherjee S, I DPP. SPECIAL ARTICLE Underground and Opencast Coal Mining Methods in India : A Comparative Assessment. 2019. p. 39e55.
• [2] Poulsen B, Khanal M, Rao AM, Adhikary D, Balusu R. Mine overburden dump failure: a case study. Geotech. Geol. Eng. 2014;32:297e309. https://doi.org/10.1007/s10706-013-9714-7.
• [3] Behera PK, Sarkar K, Singh AK, Verma AK, Singh TN. Dump slope stability analysis e a case study. J. Geol. Soc. India 2016;88:725e35. https://doi.org/10.1007/s12594-016-0540-4.
• [4] Sharma S, Roy I. Slope failure of waste rock dump at Jayant opencast mine, India: a case study. Int. J. Appl. Eng. Res. 2015;10:33006e12.
• [5] Upadhyay OP, Sharma DK, Singh DP. Factors affecting •stability of waste dumps in mines. Int. J. Surf. Min. Reclamat. Environ. 1990;4:95e9. https://doi.org/10.1080/ 09208119008944174.
• [6] Singh TN, Singh R, Singh B, Sharma LK, Singh R, Ansari MK. Investigations and stability analyses of Malin village landslide of Pune district, Maharashtra, India. Nat. Hazards 2016;81:2019e30. https://doi.org/10.1007/s11069-016-2241-0.
• [7] Steiakakis E, Thalassinakis J, Agioutantis Z, Galetakis M. Failure process of the external waste dump of a lignite mine using (FEM). 13th Int. Symp. Contin. Surf. Mining, ISCSM 2016;2016:587e93.
• [8] Zevgolis IE, Deliveris AV, Koukouzas NC. Slope failure incidents and other stability concerns in surface lignite mines in Greece. J. Sustain. Min. 2019;18:182e97. https://doi.org/10. 1016/j.jsm.2019.07.001.
• [9] Koner R, Chakravarty D. Characterisation of overburden dump materials: a case study from the Wardha valley coal field. Bull. Eng. Geol. Environ. 2016;75:1311e23. https://doi. org/10.1007/s10064-015-0830-x.
• [10] Pan W, Pan W, Luo J, Fan L, Li S, Erdenebileg U. Slope stability of increasing height and expanding capacity of south dumping site of Hesgoula coal mine: a case study. Int. J. Coal Sci. Technol. 2021;8:427e40. https://doi.org/10.1007/ s40789-020-00335-y.
• [11] Sengupta S, Sharma S, Roy I. Stability analysis of overburden internal dump material of amlohri opencast coal mine , India. ARPN J. Earth Sci. 2016;5:50e7.
• [12] Koner R, Chakravarty D. Effect of rainfall on dump slope stability: a numerical approach. Proc. 5th Intern. Conf. Exhib. Mass Min. 2008;1:877e86. https://www.researchgate.net/ publication/286937375.
• [13] Yellishetty M, Darlington WJ. Effects of monsoonal rainfall on waste dump stability and respective geo-environmental issues: a case study. Environ. Earth Sci. 2011;63:1169e77. https://doi.org/10.1007/s12665-010-0791-0.
• [14] Koner R. Estimation of optimum geometric configuration of mine dumps in Wardha valley Coalfields in India: a case study. J. Min. Environ. Times 2021;12:907e27. https://doi.org/ 10.22044/jme.2021.10979.2074.
• [15] Zhang L, Wang J, Bai Z, Lv C. Effects of vegetation on runoff and soil erosion on reclaimed land in an opencast coal-mine dump in a loess area. Catena 2015;128:44e53. https://doi.org/ 10.1016/j.catena.2015.01.016.
• [16] Rajak TK, Yadu L, Chouksey SK. Strength characteristics and stability analysis of ground granulated blast furnace slag (GGBFS) stabilized coal mine overburden-pond ash mix. Geotech. Geol. Eng. 2020;38:663e82. https://doi.org/10.1007/ s10706-019-01056-z.
• [17] Pradhan SP, Vishal V, Singh TN, Singh VK. Optimisation of dump slope geometry vis-à-vis flyash utilisation using numerical simulation. Am. J. Min. Metall. 2014;2:1e7. https:// doi.org/10.12691/ajmm-2-1-1.
• [18] Rai R, Kalita S, Gupta T, Shrivastva BK. Sensitivity analysis of internal dragline dump stability: finite element analysis. Geotech. Geol. Eng. 2012;30:1397e404. https://doi.org/10. 1007/s10706-012-9541-2.
• [19] Nguyen PMV, Wrana A, Rajwa S, Różański Z, Frączek R. Slope stability numerical analysis and landslide prevention of coal mine waste dump under the impact of rainfallda case study of janina mine, Poland. Energies 2022;15. https://doi. org/10.3390/en15218311.
• [20] Verma D, Kainthola A, Thareja R, Singh TN. Stability analysis of an open cut slope in Wardha valley coal field. J. Geol. Soc. India 2013;81:804e12. https://doi.org/10.1007/s12594-013-0105-8.
• [21] Geete SS, Singh KH, Verma AK, Singh TN, Dahale PP. Stability analysis of overburden dump slopeda case study of Marki Mangli-I coal mine. Lect. Notes Civ. Eng. 2023;303: 83e99. https://doi.org/10.1007/978-981-19-7245-4_9.
• [22] Verma H, Rudra ESCK, Rai R, Pandian KA, Manna B. Design of dump slope on weak foundation. J. Inst. Eng. Ser. D 2023;104:107e18. https://doi.org/10.1007/s40033-022-00396-0.
• [23] Sekhar S, Singh UC, Porathur JL, Budi G. Overburden dump stabilization over weak floor using rock-filled trench near the toe d a numerical modeling approach. 2021.
• [24] Janbu N. Slope Stability Computations. Embankment-Dam Eng; 1973. p. 47e86. https://doi.org/10.1016/0148-9062(75) 90139-4.
• [25] Duncan JM. State of the art: limit equilmrium and finite-element analysis of slopes. J. Geotech. Eng. 1996;122:577e96. https://doi.org/10.1061/(ASCE)0733-9410(1996)122:7(577).
• [26] Clough RJ, R W, Woodward. Analysis of embankment stresses and deformations. J. Soil Mech. Found Div., ASCE 1967;17:11e26.
• [27] Kainthola A, Verma D, Gupte SS, Singh TN. A coal mine dump stability analysisda case study. Geomaterials 01 2011: 1e13. https://doi.org/10.4236/gm.2011.11001.