OPTIMIZATION OF SUPPLY TRAINS IN TUNNEL BORING OPERATION USING TUNNEL BORING MACHINES
Published In: 6TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): JIRAWAT DAMRIANANT
Abstract: A large drainage-tunnel with an inside diameter of 5 m will be constructed in Bangkok using tunnel boring machines (TBM) by the end of 2018. One of the most challenging problems in this operation is how to determine the number of supply trains containing muck cars for the muck evacuation process during the boring. This paper presents an optimization of the number of the supply trains employed in the project so that the operation of the train fleet will be well synchronized with that of the TBM. Petri Net-based models and their simulation are used as the means for the optimization. The COSMOS simulator, which is reliable software for running Pet Net-based models, is used for the simulation. The simulation results indicate that the optimal numbers of supply trains are 2, 3, 4 and 5 for the tunnel lengths of 0-0.9, 0.9-2.7, 2.7-4.5 and 4.5-5.5 km, respectively. The analysis of these results also offers the numbers and the locations of the double track positions for each interval of the tu
- Publication Date: 29-Apr-2018
- DOI: 10.15224/978-1-63248-150-4-23
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NUMERICAL SIMULATION OF TRANSVERSE THERMAL EXPANSION OF FRP BARS EMBEDDED IN CONCRETE SLABS
Published In: 6TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): ALI ZAIDI , HIZIA BELLAKEHAL , RADHOUANE MASMOUDI , SAMIA LARDJANE
Abstract: The thermal behavior is one of the main drawbacks of fiber reinforced polymer (FRP) bars embedded in concrete due to the significant difference between the transverse coefficient of thermal expansion of FRP bars and that of concrete. This difference generates a radial pressure at the FRP bar/concrete interface under high temperatures, and may cause splitting cracks within concrete. This paper presents a numerical study using ADINA finite elements software to predict transverse thermal strains in glass FRP (GFRP) bars and concrete cover of GFRP bars-reinforced concrete slabs submitted to a temperature increase varied from -50 to +60°C and having a ratio of concrete cover thickness to FRP bar diameter varied from 1.3 to 2.8. The transverse thermal strains, at FRP bar/concrete interface and at external surface of concrete cover, obtained from the numerical model are compared with those obtained from the analytical model and experimental tests.
- Publication Date: 29-Apr-2018
- DOI: 10.15224/978-1-63248-150-4-24
- Views: 0
- Downloads: 0