Document Type : Original Research Paper
Authors
1 Chandigarh University and CSIR- Central road research institute New Delhi.
2 Senior Principal Scientist, Geotechnical Engineering Division, CSIR- Central Road Research Institute, New Delhi, 110025; Professor, Academy of Scientific & Innovative Research, Ghaziabad 201002
3 Scientist, Geotechnical Engineering Division, CSIR- Central Road Research Institute, New Delhi, 110025
4 Assistant Professor, Department of Civil Engineering, Chandigarh University, Mohali, 140413
5 Principal Scientist, CSIR-Central Road Research Institute, India
Abstract
The rapid development of road networks needs huge construction materials. Mining and industrial wastes can be used as sustainable road construction materials and will be alternatives to fulfill the huge demand in road construction. Zinc tailing is one such mining waste and has the potential for road construction. This material was collected from Zawar mines (Rajasthan), and characterization was carried out for embankment/subgrade applications. A physical model test was conducted in the laboratory to examine the stress-settlement behaviour. To improve the modulus value of tailing, it was reinforced with geogrid in two different laying patterns, viz. layer/loop and stress-settlement behavior was studied. Different parameters were studied: reinforcement depth, layer of reinforcement, number of loops, and depth of loop of reinforcement. The experimental result was validated with the numerical finite element method (SoilWorks). Tailing comprises fine-grained silt-size particles (61%) with no swelling behavior and non-plastic nature. It has values of MDD and OMC as 1.86 g/cm3 and 11%, respectively. It has a higher value of CBR (12%) and internal friction angle (34.6o) with cohesionless nature. The variation of settlement with stress is linear for reinforced and unreinforced tailing fill. As the depth of reinforcement increases, settlement increases in both layer and loop reinforcement. The settlement trajectory obtained from a numerical method closely resembles that of a laboratory physical model, particularly when the applied stress is up to 600 kPa. The modulus of elasticity of tailing was significantly improved with the introduction of geogrid reinforcement either in layer or loop.
Keywords
Main Subjects
)