Doğan AYDAL, Olgu POLAT, Yusuf Gökhan AYDAL, Mustafa YANALAK

Computing excavated volume in a road project using GIS programs: a case study from Şırnak, Turkey

Toprağı kaldırma işlemlerinin yol yapım projelerinde önemli bir miktar tuttuğu çok iyi bilinmektedir. Bu sebeple, bir yol projesinde, gerçekçi kazı ve dolgu miktarlarının bulunması, iyi bir maliyet tahmininin belirlenmesi için önemlidir. Bu çalışmanın özü, Sımak İl'i dağlık bölgelerindeki bir'yol projesinde, aynı yüzey ölçülerini kullanarak, klasik yollar ile hesaplanan kazı-dolgu hesaplarının, Coğrafi Bilgi Sistemleri (CBS) metodları kullanarak yapılan hesaplar ile karşılaştırılmasıdır. Bu çalışmada, karşılaştırma yapabilmek için, bölgesel topografik verilerden üretilen ve belli bir Z taban konturundan itibaren oluşturulan sayısal yükseklik modeli ile bölgede yol ve yarma yapımından sonra oluşturulan sayısal yükseklik modelinin hacimleri kullanılmıştır. Sonuç olarak, bu çalışma ile, yarma ve dolgu hesaplamalarının yapılabileceği, hatta kazı ve dolgu hesaplarının ayrı ayrı olarak da hesaplanabileceği gösterilmiştir. Klasik yollar ve Coğrafi bilgi Sistemleri kullanılarak elde edilen hesapların genelde benzer olduğu görülmektedir. Özellikle, dolgu yapılan alanlardaki hesapların oldukça yakın olduğu, fakat her nasılsa, kazı yapılan yerlerde klasik yollar ile elde edilen değerlerin CBS ile elde edilen değerlerden yüksek olduğu görülmüştür. Mamafih, kısa sürede hazırlanabilen bu kazı-dolgu sonuçları bile, CBS teknikleri ile, kazı-dolgu öncesinde veya sonrasında hesaplamaların yapılabileceğini göstermiştir. Bunun, İhaleye giren müteahitler veya ihaleyi açan kurumlar tarafından hazırlanacak veya kontrol edilecek tekliflerin güvenilir ve önemli olmasını sağlayacağı gösterilmiştir.

Yol projelerinde CBS programları kullanarak kazı- dolgu hacimlerinin hesaplanması: Şırnak- Türkiye'de bir çalışma

It is well known that earthmoving operations represent a substantial amount of total road-construction costs. Accurate estimations of cut and fill quantities are essential to realistic cost estimates for road-conştruction projects At the core of this study is a comparison of cut-fill calculations done using classical methods with the same calculations done via GIS methods, both using the same original surficial measurements from a roadbuilding project in a mountainous part of Şırhak province. In this study, a digital elevation model derived from regional topographic data was used as the basis for the comparison of volume based on z values of floor contours with volume derived from a digital elevation model based on topographic data acquired following road and roadcut creation in the region. As a result, it has been demonstrated in this study that the total amounts of cut and fill can be thus calculated, and also that calculations for roads and roadcuts can be done separately. Values obtained via classical methods and those acquired by GIS calculations were compared in this study, revealing that values obtained from the two methods are similar. In particular, values from fill areas are quite close, but in cut areas values obtained using classical methods were seen to be somewhat higher than those from GIS methods due to poor tracking by contractors, Nevertheless, it has been demonstrated that these types of calculations - whether done prior to cut-fill work or after the work is finished, and whether done by the contractor/subcontractor or by the awarding institution - are important both for short-term benefits and for reliable financial estimates.

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Anderson, J.M. and Mikhail, E. M., 1998, "Surveying: Theory and Practice", McGraw-Hill Book Co., Inc., 7th Edition, New York, N.Y.'
Yanalak, M. and Bay kal, O., 2003, "Digital Elevation Model Based Volume calculation Using Topographical Data", ASCE, Journal of Surveying Engineering, 129(2): 58-64
Yanalak, M., 2005, "Computing Pit Excavation Volume", ASCE, Journal of Surveying Engineering, 131(1):15-19
Easa, S.M., 1998, "Smooth surface approximation for computing pit excavation volume". ASCE, J. Surveying Engineering, 124(3), 125-133.
Chambers, D.W, 1989, "Estimating pit excavation volume using unequal intervals". ASCE, J. Surv. Engng., , 115(4), 390-401.
Chen, C.S. and Lin, H.C., 1991, "Estimating pit excavation volume using cubic spline volume formula". ASCE, J. Surv. Engng., ASCE, 117(2), 51-66.
Stark, R. and Mayer, R., 1981, "Eartmoving logistics". ASCE, Journal of the Construction division.107(CO2):297-312.
Nandgaonkar, S., 1981, "Earthwork transportation allocation: operation research". ASCE, Journal of the Construction division, 107(CO2)-373-392.
Easa, S.M., 1988, "Estimating pit excavation volume using nonlinear ground profile". ASCE; J. Surveying Engineering, 114(2), 71-83.
Siyam, Y., 1987, "Precision in cross-sectional area calculation on eartwork determination". ASCE Journal of Surveying Engineering, 113(2):139-151.
Christian, J. and Caldera, H., 1988,"Earthmoving cost optimization by operational research". Canadian Journal of Civil Engineering, 15:679-684.
Alkass,S. and Harris, F., 1988, "Expert system for earthmoving equipment selection in road construction". ASCE, Journal of Construction Engineering and Management,114(3)-.426-440.
Epps, J. and Corey, M., 1990, "Cut and Fill calculation by modified average-end-area method". ASCE, Journal of Transportation Engineering, 116( 5):683-
Jayawardane,A., and Harris,F., 1990, "Further development of integer programing in eartwork optimization". ASCE, Journal of Construction Engineering and Management. 116(1 ):18-34.
Easa, S., 1991, "Pyramid frustum formula for computing volumes at roadway transition areas". ASCE, Journal of Surveying Engineering, 117(2):98-101.
Shi.J. and Abourizk, S., 1997, "Resource-based modelling for construction simulation". ASCE, Journal of Construction Engineering and Management, 123(1 ):26-33.
Miles, S. and Ho, C, 1999, "Application and issues of GIS as tool for civil engineering modelling". ASCE, Journal of Computing modelling in Civil Engineering. 13(3): 144-152.
Shi, J., 1999, "A neutral network based system for predicting earthmoving production. Construction Management and Economics, 17: 463-471.
Oloufa,A.A., 1991, "Triangulatio.n application". ASCE, Journal of Computing in Civil Engineering.5(l): 103-121. ''
Petrie, G. and Kennie, T.J., 1987, "Terrain modelling in surveying and civil engineering". Computer-Aided Design. 19(4): 171-187.
Chen, C.S.and Lin, H.C., 1992, "Estimating excavation volume using new formulas". Survey Land Information System.104-111.
Easa, S., 1992, "Estimating earthwork volumes of curved roadways: mathematical model". ASCE , Journal of Transportation Engineering, 118(6): 834-
Kalmar, J., Papp, G. and Szabo, T., 1995, "DTM based surface and volume approximation, geopysical application". Computer Geoscience, 21(2),245-257.
Fiedler, J., 1992, "Orthometric heights from global poisioning system". ASCE, Journal of Surveying Engineering, 118(3),70-79.
Fan,H., 1988, "On the Earth elipsoid best fitted to the surface". Journal of Geodesy,72(9), 511-515.
Smith,D.A. and Small, H.J., 1999, "The Carip97 high-resolution geoid hight model for the Caribbean Sea". Journal of Geodesy, 73(1),1-9.
Watson, D., 1992, "Contouring guide to the analysis and display of spatial data". Pergamon press, Oxford, England, 321.
Li, Z., 1991, "Effects of check points on the reliability of DTM accuracy estimates obtained from experimental tests", Photogrammetric Engineering & Remote Sensing, 57(10), 1333-1340.
Li, Z., 1992, "Variation of the Accuracy of Digital Terrain Models With Sampling Interval", Photogrammetric Record, 14(79), 113-128.
Li, Z., 1993, "Mathematical Models of The Accuracy of Digital Terrain Model Surfaces Linearly Constructed From, Square Gridded Data", Photogrammetric Record, 14(82), 661-674.
Li, Z., 1994, "A comparative study of the accuracy of digital terrain models(DTM)based on varios data models".ISPRS,Journal of Photogrammetry and Remote Sensing,49(1), 2-11.