Effect of Subsurface Materials on Earthwork Operation Costs of Forest Road
Abstract
Major cost of forest construction operation is spent to earthwork operations. Therefore, time studies, estimation machine productivity and earthwork operation cost would be necessary to better utilization of current resources. In this research, impact of subsurface materials as key factor in forest road construction operation was investigated in a one kilometer forest road as study area. Subsurface material of the road, constructed by a Hydraulic excavator and a bulldozer, was contained three layers in term of digging: soft (soil), medium and hard (rocky). For this purpose, time of machines work cycle elements included warm up, movement from camp to study area, extracting remained trunk if any, earthwork activity, mealtimes and regular delays were accurately recorded during 15 working days. Furthermore, relevant cut and fill subsurface material was measured precisely. The results of continues time studies showed that mean production rates vary from 34.98 m3/hr in hard layer to 331.63 m3/hr in soft layer. The results indicated that there was a direct relationship between rock share volume and delay times, therefore technical and personal delays in rocky layers were considerably more than other layers. Proportions of delays were 9% and 16% in soil and rocky layers, respectively. Also, production cost was 0.12 $/m3, 0.27 $/m3 and 1.13 $/m3 in soil, medium, and rocky layers, respectively.
Keywords
Time study,Earthwork operation,Digging,Rock share,Hourly cost
References
- Abeli, W.S., 1985. Forest road planning and control by mathematical Programming and time study analysis. Ph.D. Thesis, Sokoine University of Agriculture, Morogoro. 229p.
- Akay, A.E., 2003. Minimizing total cost of construction, maintenance, and transportation costs with computer-aided forest road design. Ph.D. thesis, Oregon State University, Corvallis.
- Aruga, K., Sessions, J., Akay A.E., 2005. Heuristic planning techniques applied to forest road profiles, Journal of Forest Research, 10: 83–92.
- Cabezas, W., 1994. Informe finale valuation deequips en La construction de Caminos. Informetecnico Forestal MININCO S.A, Concepcion, FAO, Rome, 37p.
- Contreras, M., Aracena, P., Chung, W., 2012. Improving Accuracy in Earthwork Volume Estimation for Proposed Forest Roads Using a High-Resolution Digital Elevation Model, Croatian Journal of Forest Engineering, 33(1): 125-142.
- Ezzati, S., Sammani, K.M., Najafi, A., Hasangholipour H., 2011. Evaluate and develop an existing forest road network base on environmental factors, Forestry, 17(2):42.
- FAO, 1992. Cost control in forest harvesting and road construction. Food and Agriculture Organization of the United Nations, Rome, Forestry Paper, 99: 38-89.
- Ghajar, I., Najafi, A., Torabi, S.A., Khamehchiyan, M., Boston, K., 2012. An Adaptive Network- based Fuzzy Inference System for Rock Share Estimation in Forest Road Construction, Croatian Journal of Forest Engineering, 33: 313-328.
- Gumus S., Acar, H.H., Toksoy, D., 2008. Functional Forest Road Network Planning by Consideration of Environmental Impact Assessment for Wood Harvesting, Environmental Monitoring and Assessment, 142: 109–116.
- Hossienpour, Asli, K., Naghdi, R., Nikooy. M., 2015. Estimation of cost and the amount of production in construction of forest road by combining hydraulic excavator and bulldozer (Case study: Liashisera district, Guilan Province), Iranian Journal of Forest and Poplar Research, 23(2): 320-331 (In Persian).
