Issue 5
Research Paper
Development of Intensity-Duration-Frequency (IDF) Models for Manually Operated Rain Gauge Catchment: A Case Study of Port Harcourt Metropolis Using 50years Rainfall Data
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 627-635
DOI:
10.30684/etj.2021.131839.1064

3D Numerical modeling of Soft soil Improved by Rigid Inclusions Supported an Embankment
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 636-648
DOI:
10.30684/etj.2021.132023.1083

A three-dimensional finite element model suggested to determine the settlements and stresses of an embankment placed on soft soil reinforced by rigid inclusions. To make it simple the layers of soil and the embankment are supposed to be horizontal in a semi-infinite medium and the base of the soft soil is supposed to be rigid (bedrock). The interacting elements of the model are supposed to be elastic. The determination of the behavior of the soil-inclusions-embankment system was realized according to the construction phases of the embankment layers. The settlements and stresses were calculated according to construction phases of the embankment layers. At the end of each calculation phase, the stress field and the displacement field are extracted. The values are then introduced into the model the beginning of the next phase. The obtained results are presented in terms of the (settlement) vertical displacements and vertical stresses for the elementary cell and the global model respectively. This study allows the observation of three-dimensional interactions; the mechanisms of load transfer and the interaction between the different zones of the embankment. The numerical calculations are much lower than those measured in situ. A verification calculation on the stresses transmitted by the rigid inclusion shows that only 90% of the total load is applied with the numerical calculation.
Monitoring Soil Degradation in The Mesopotamian Plain Using GIS and Remote sensing Techniques
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 649-660
DOI:
10.30684/etj.v40i5.2121

Finite Element Simulation of Repeated Loading Test of Asphalt Concrete
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 661-667
DOI:
10.30684/etj.v40i5.2128

Push–out Test of Timber Concrete Composite Construction
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 668-676
DOI:
10.30684/etj.v40i2.2175

SWOT-Based Assessment of the Maintenance Management of the Wastewater Treatment Plants in Iraq
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 677-694
DOI:
10.30684/etj.v40i5.2146

Assessment of Future Climate Change Impacts on Water Resources of Khabour River Catchment, North Of Iraq
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 695-709
DOI:
10.30684/etj.v40i5.1925

Effect of Partial Saturation on Ultimate Bearing Capacity of Skirted Foundations
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 710-721
DOI:
10.30684/etj.v40i5.2259

Modeling Critical Gap of Al Turkmani Roundabout in Baghdad City
Engineering and Technology Journal,
2022, Volume 40, Issue 5, Pages 722-731
DOI:
10.30684/etj.v40i5.1628
Interest in how roundabouts can most effectively be used continues to increase to achieve goals of safety, efficiency, along with other benefits. This research presents the most important element of the operational performance of roundabout traffic intersections in Baghdad city on capacity analysis. The obtained results for critical headway time are (3.35 sec) and (2.8 sec) for the Main west and East approaches. Also, the critical gap value for the West and East approach is less than the range of (NCHRP 572), possibly attributed to the congested traffic volume in Al Turkman roundabout with aggressive driver behavior. Calculating in the west and East approaches peak period (1:00-2:00) pm to describe the rejected and accepted gaps with ranges from (1.00 – 5.00) sec, the main aim of this research is to model the critical headway by analyzing the data in trial and error technique to determine the shape of the data through Probability density function and Cumulative Density Function, and the Mathematical function that represented, exponential distribution functions for critical gaps with different shape functions scale (1,1.5) for accepted and rejected gaps are better fittings to the empirical distribution, and there is no significant difference. Comparing the observed field data and the theoretical data for the validation process of Rejected and Accepted Gaps are done. A good fit is obtained, and a scatterplot for observed and theoretical data has been drawn for the West and East approaches at peak period (1:00-2:00) pm.