Fig. 1. Overall procedure for calculating Unsurfaced Road Condition Index (URCI) value
Fig. 2. Severity levels of the improper cross section. (a) Low. (b) Middle. (c) High
Fig. 3. Severity levels of the inappropriate roadside drainage. (a) Low. (b) Middle. (c) High
Fig. 4. Severity levels of the corrugations. (a) Low. (b) Middle. (c) High
Fig. 5. Severity levels of the dust. (a) Low. (b) Middle. (c) High
Fig. 6. Severity levels of the ruts. (a) Low. (b) Middle. (c) High
Fig. 7. Severity levels of the loose aggregate. (a) Low. (b) Middle. (c) High
Fig. 8. Curves for calculating the deduct value for each distress factor (Department of the Army, 1995)
Fig. 9. Curves for calculating the URCI value (Department of the Army, 1995)
Fig. 10. Development of the URCI application using MIT App Inventor. (a) Interface design. (b) Coding blocks
Fig. 11. Graphic user interface of the URCI application on smartphones. (a) Part for adding general information of study area. (b) Part for investigating the quantity and severity of seven distress factors. (c) Part for calculating the URCI value and rating
Fig. 12. View of the study area. Section 1: 6m × 3.6m. Section 2: 12m × 3.6m. Section 3: 15m × 3.6m. Section 4: 7m × 4.2m
Fig. 13. Investigation of unsurfaced road condition at the study area using the URCI application. Photos showing (a) how the URCI application is used in the field, (b) general information of study area, (c) investigation results of distress factors, (d) a picture taken during investigation. (e) results of URCI calculations
Table 1. Severity levels of the potholes (Department of the Army, 1995)
Table 2. Unsurfaced road condition rating according to the URCI value (Department of the Army, 1995)
Table 3. Quantity and severity of distress factors investigated at the study area
Table 4. Results of URCI calculations at the study area
References
- Baek, J. and Choi, Y., 2017, A New Method for Haul Road Design in Open-pit Mines to Support Efficient Truck Haulage Operations, Applied Sciences, Vol. 7, 1-19, doi:10.3390/app7070747.
- Baek, J., Choi, Y., Lee, C. and Jung, J., 2018, Performance Comparison of Bluetooth Beacon and Reverse RFID Systems as Potential Tools for Measuring Truck Travel Time in Open-pit Mines: A Simulation Experiment, Geosystem Engineering, Vol. 21, 43-52, doi:10.1080/12269328.2017.1370616.
- Baek, J., Choi, Y., Lee, C., Suh, J. and Lee, S., 2017, BBUNS: Bluetooth Beacon-Based Underground Navigation System to Support Mine Haulage Operations, Minerals, Vol. 7, 1-16, doi:10.3390/min7110228.
- Bonates, E.J.L., 1996, Interactive truck haulage simulation program, In: Hennies, W.T., Ayres Da Silva, L.A. and Chaves, A.P. (eds), Mine Planning and Equipment Selection 1996, Balkerma, Rotterdam, Netherlands, pp. 51-57.
- Choi, Y., 2011, New software for simulating truck-shovel operation in open pit mines, Journal of the Korean Society for Geosystem Engineering, Vol. 48, No. 4, pp. 448-459.
- Choi, Y. and Nieto, A., 2011a, Optimal Haulage Routing of Off-road Dump Trucks in Construction and Mining Sites Using Google Earth and a Modified Least-Cost Path Algorithm, Automation in Construction, Vol. 20, 982-992. https://doi.org/10.1016/j.autcon.2011.03.015
- Choi, Y. and Nieto, A., 2011b, Software for simulating open-pit truck/shovel haulage systems using Google Earth and GPSS/H, Journal of the Korean Society for Geosystem Engineering, Vol. 48(6), 734-743.
- Choi, Y., Park, H.D., Sunwoo, C. and Clarke, K.C., 2009, Multi-Criteria Evaluation and Least-Cost Path Analysis for Optimal Haulage Routing of Dump Trucks in Large Scale Open-Pit Mines. International Journal of Geographic Information Science, Vol. 23, 1541-1567. https://doi.org/10.1080/13658810802385245
- Choi, Y., Park, S., Lee, S., Baek, J., Jung, J. and Park, H., 2016, Development of a Windows-based Program for Discrete Event Simulation of Truck-Loader Haulage Systems in an Underground Mine, Tunnel & Underground Space, Vol. 26(2), 87-99. https://doi.org/10.7474/TUS.2016.26.2.087
- Department of the Army, 1995, Unsurfaced Road Maintenance Management, TM 5-626, WASHINGTON, DC, USA, 50p.
- Jung, J., and Choi, Y., 2017, Measuring Transport Time of Mine Equipment in an Underground Mine Using a Bluetooth Beacon System, Minerals, Vol. 7(1), 1-10. doi:10.3390/min7010001.
- MIT App Inventor. 2018, App Inventor, http://appinventor.mit.edu/explore/ (accessed on 22 August 2018).
- Park, S. and Choi, Y., 2013, Simulation of shovel-truck haulage system by considering truck dispatch methods, Journal of the Korean Society for Geosystem Engineering, Vol. 50(4), 543-556.
- Park, B., Choi, Y. and Park, H.S., 2013, Creation of vector network data with considering terrain gradient for analyzing optimal haulage routes of dump trucks in open pit mines, Tunnel & Underground Space, Vol. 23(5), 353-361. https://doi.org/10.7474/TUS.2013.23.5.353
- Park, B., Choi, Y. and Park, H.S., 2014a, Optimal routes analysis of vehicles for auxiliary operations in open-pit mines using a heuristic algorithm for the traveling salesman problem, Tunnel & Underground Space, Vol. 24(1), 11-20. https://doi.org/10.7474/TUS.2014.24.1.011
- Park, S., Choi, Y. and Park, H.S., 2014b, Simulation of shovel-truck haulage system in open-pit mines by considering breakdown of trucks and crusher capacity, Tunnel & Underground Space, Vol. 24(1), 1-10. https://doi.org/10.7474/TUS.2014.24.1.001
- Park, S., Choi. Y., and Park, H.S., 2014c, Simulation of truck-loader haulage systems in an underground mine using GPSS/H, Tunnel & Underground Space, Vol. 24(6), 430-439. https://doi.org/10.7474/TUS.2014.24.6.430
- Park, S., Lee, S., Choi, Y. and Park, H.S., 2014d, Development of a windows-based simulation program for selecting equipments in open-pit shovel-truck haulage systems, Tunnel & Underground Space, Vol. 24(2), 111-119. https://doi.org/10.7474/TUS.2014.24.2.111
- Park, B., Park, S., Choi, Y. and Park, H.S., 2015, Calculation of a Diesel Vehicle's Carbon Dioxide Emissions During Haulage Operations in an Underground Mine Using GIS, Tunnel & Underground Space, Vol. 25(4), 373-382. https://doi.org/10.7474/TUS.2015.25.4.373
- Park, S., Choi, Y. and Park, H.S., 2016, Optimization of truck-loader haulage systems in an underground mine using simulation methods, Geosystem Engineering, Vol. 19(5), 222-231. https://doi.org/10.1080/12269328.2016.1176538
- Suh, J., Lee, H. and Choi, Y., 2016, A Rapid, Accurate, and Efficient Method to Map Heavy Metal-Contaminated Soils of Abandoned Mine Sites Using Converted Portable XRF Data and GIS, International Journal of Environmental Research and Public Health, Vol. 13(12), 1191, doi:10.3390/ijerph13121191.
- Temeng, V.A., 1997, A computerized model for truck dispatching in open pit mines, PhD dissertation, Michigan Technological University, Michigan, USA, 306p.