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2 Journal of Sustainable Mining

2 2025

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Rockfill trenching for enhancing overburden dump height on weak soil strata

Shende Rahul, Venkatraman Srinivasan, Pandian Athiveera, Jain Shubham, Patel Anjan

Journal of Sustainable Mining

2025

Vol. 24, iss. 3

424--435

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.

Feasibility study for providing remedial measures for overburden dump in new Majri UG to OC mine, WCL Majri area, Warora, Chandrapur

Jangir Himanshu Kumar, Shende Rahul, Navagire Omkar, Venkatraman Srinivasan, Mandal Anirban, Patel Anjan

Journal of Sustainable Mining

2025

Vol. 24, iss. 1

158--174

The central region of India is abundant in fertile black cotton soil, and the presence of such weak floors in open-cast mines poses significant slope stability concerns for overburden (OB) dumps. Addressing these issues is crucial for ensuring safe mining operations and cost-effectiveness. Several coal mines in this region have experienced overburden dump collapses due to the weak soil foundation. To enhance slope stability and mitigate the heaving effect near the toe of the dump, this study proposes parametric research that explores the flattening of the overall slope angle of the dump, bench angle optimization, and various feasible dimensions for rock-filled trenches, respectively. Using two-dimensional numerical modeling with SLOPE/W and SIGMA/W software, analyzed the slope stability and load-deformation behavior of the OB dump at the New Majri UG to OC mine in the Wardha Valley coalfields of Western Coalfields Limited (WCL). The results demonstrate that flattening the overall slope angle, bench angle optimization, and constructing a rock-filled trench with an effective width and depth significantly enhance stability. Additionally, this study provides further remedial measures, such as implementing erosion control techniques, to prolong the dump's life and reduce the adverse effects of erosion. The comprehensive analysis and suggestions aim to improve the safety and durability of OB dumps in mining operations.