Faculty Publications
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Item Optimization of shovel-dumper system in surface mines by using match factor method(2009) Mangalpady, M.Computers have brought a revolution in almost every realm of life and become an indispensable part of human activities. Mining industry is no such exception. One of the major problems in surface mining is materials handling, which involves transportation of both ore and overburden. Most of the projects make use of shovel-dumper system due to its high degree of flexibility. This paper addresses application of match factor method for optimization of shovel-dumper fleet in surface mine projects. A surface iron ore mine was simulated using the computer model developed and the match factor was calculated for existing system. To make match factor unity compared to existing match factor of 0.43, it was found that the number of dumpers would have to be increased to 54, in addition to existing trucks. The model attempts to quantify the apparent balance between the number of loading devices and the number of haulage equipment needed.Item A comparison of limit equilibrium method of slope stability analysis with finite element modelling(2009) Mangalpady, M.Stability analysis of slopes susceptible to different types of failures can be performed with different techniques. The selection of an appropriate technique is, therefore, very important in a process of slope stability evaluation. In this paper, slopes of a large surface iron ore mine was analyzed by limit equilibrium method and by finite element modelling. GALENA software was used for analysis by limit equilibrium method and ANSYS for finite element modelling (FEM). Factor of safety (FOS) was calculated by both the methods and they are compared for their applicability. Based on the results obtained by the analysis, conclusions were drawn on the application of these methods. It was found that FEM analysis gives factor of safety value which is found to be lesser than the values determined by limit equilibrium method. This is because it considers more parameters and performs a detailed analysis of stress and strain conditions in the strata under consideration.Item Studies on iron tailings towards usage for paving blocks manufacture(2010) Mangalpady, M.; Sampath Kumar, N.N.Disposal of mill tailings is one of the major problems in mining industry. Investigations are being done all over the world to utilize tailings for useful purposes. The scope of this work is to study the utilization of iron ore tailings in manufacture of concrete paving blocks. Five reference mixes were prepared using cement, jelly dust and baby jelly. Ten paving blocks were prepared from each type of mix, out of which five specimens were cured for 7 days and five were cured for 28 days. By using sand and tailings as fine aggregates, two modified mixes were prepared by replacing jelly dust partly in reference mixes. Similar to reference mix, five mix ratios were made and ten paving blocks were prepared from each type of mixtures. From each set of paving blocks, five specimens were cured for 7 days and the other five specimens were cured for 28 days. Laboratory tests were conducted to assess water absorption and compressive strength of specimens, and graphs were plotted for their comparison among each type of respective mix ratios. In all the comparisons, compressive strength of tailing based mix was higher than the respective reference mix. Similar trend is shown by the graphs plotted for water absorption. © 2010 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.Item Utilisation of mine waste in the construction industry - A Critical Review(CAFET INNOVA Technical Society 1-2-18/103, Mohini Mansion, Gagan Mahal Road, Domalguda, Hyderabad 500029, 2016) Shreekant, R.L.; Mangalpady, M.; Vardhan, H.The exploitation of mineral resources would promote the development of economy and society, but it will also generate massive waste/tailings that may pollute the environment significantly (in the form of spreading of waste in and around the mines, siltation of soil/slimes in nearby water bodies, air pollution etc.) Therefore, developing comprehensive utilization of waste fines/tailings in large scale is the need of the day in order to improve the surroundings and for sustainable development of resources. Manufacturing of non-fired bricks is one of the options for utilization of waste generated in mines along with reduction of CO2 emission. If the waste material is improperly dumped in mine site, the flow of material during rainy season may reduce the fertility of nearby agricultural land. Hence, waste utilization plays a vital role in natural resource conservation. Further, building blocks/bricks from mine waste is eco-friendly as it utilizes waste and reduces air, land and water pollution. It is energy efficient and also cost effective as reported by various investigators in the past. Hence, it is very much necessary to find alternative for making use of iron ore waste material (fines)/tailings as an aggregate in construction materials like bricks or paving blocks. This paper provides a critical review of the utilization of mine waste for brick making in the construction industry. © 2016 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.Item Investigating the Utility of Iron Ore Waste in Preparing Non-fired Bricks(Springer India sanjiv.goswami@springer.co.in, 2017) Lamani, S.R.; Mangalpady, M.; Vardhan, H.Iron ore waste is a major problem for mine owners due to the difficulty involved in its storage, handling and other environmental related issues. An alternative solution to this is utilisation of iron ore waste (IOW) as some value added product in construction industry. An attempt has been made in this paper in examining the possibility of making non-fired bricks from iron ore waste with some additives like cement and fly-ash. Each of the additives were mixed with IOW in different ratios and different sets of bricks were prepared. The prepared IOW bricks were cured for 7, 14, 21 and 28 days and their respective compressive strength and percentage of water absorption were determined. The results show that IOW bricks prepared with 9% and above cement and with 28 days of curing are suitable for brick making and meet the IS specifications. It was also observed that the weight of the prepared bricks with 9% cement with 28 days of curing varies between 2.35 and 2.45 kg whereas the weight of compressed fire clay bricks varies from 2.80 to 2.89 kg. Results also show that the cost of bricks prepared with cement ranging from 9 to 20% is comparable to that of commercially available compressed bricks. © 2016, The Institution of Engineers (India).Item Fuzzy Logic-Based Rapid Upper Limb Assessment: A Novel Approach to Evaluate the Postural Risk of Dumper Operators(Springer, 2023) Kar, M.B.; Mangalpady, M.; Kunar, B.M.It is proved that the accuracy of the standard Rapid Upper Limb Assessment (RULA) method for evaluating the risk of work-related musculoskeletal disorders (WRMSDs) is often poor. In this paper, a fuzzy logic-based RULA system was developed to address this issue using the MATLAB software package. To evaluate the developed system, 15 dumper operators working in the surface iron ore mine were randomly selected. Video footage of their driving postures was recorded while they were performing different job cycles, such as loading, full-load travel, unloading, and empty travel. The video footage was examined to identify the most frequent driving postures. From this posture, the range of motion of both the axial and appendicular body parts was measured. The measured data were used as input parameter for the fuzzy model to calculate the fuzzy RULA score. The result revealed that 20% of the driving postures adopted by the dumper operators correspond to the medium risk of WRMSDs. Furthermore, the interquartile range of the fuzzy RULA score during dynamic operations was found to be small. This indicates that the fuzzy RULA score remained consistent throughout the dynamic operations. In contrast, the interquartile range exhibited large magnitude in the static operations, thus indicating a greater level of variation in fuzzy RULA score. The correlation test and Bland–Altman analysis were performed to compare the standard and fuzzy RULA scores. This analysis proved that the fuzzy logic-based method is a reliable alternative to the standard method for assessing RULA scores among dumper operators. © 2023, The Institution of Engineers (India).