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Study on the Application of FRP Bars Concrete in Shield Driving

Author: SunHui
Tutor: ZhengJunJie
School: Huazhong University of Science and Technology
Course: Geotechnical Engineering
Keywords: fiber reinforced plastic bars concrete glass fiber reinforced plastic bars shield tunnel shaft start entrance
CLC: U455.43
Type: Master's thesis
Year: 2007
Downloads: 129
Quote: 1
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Abstract


In order to decrease the complexity and risk of the shield driving, the application of FRP bars concrete in shield driving emerged. It is different from existing means, for it is no need to improve the outside soil mass of the well, and the wall with novel material is cut by the shield directly instead of removing it by man. There is few application of this method in our country, so it is necessary to study the application of FRP bars concrete in shield driving. The main contents of this thesis are as follows:Firstly, the design methods of caisson shaft and concrete diaphragm shaft were introduced in this thesis. According to the thickness of retaining wall, the dimensions of start shaft of shield driving and the design load and the boundary conditions of the two types of shafts, the calculation model of FRP bars concrete structural component was established.Secondly, based on the design methods of concrete structures reinforced with steel bars and FRP bars at home and abroad, the differences of these two structures were analyzed. The concrete bidirectional slab reinforced with GFRP bars was designed properly considering the mechanic characteristics of GFRP bars.Thirdly, the flexural behavior of concrete bidirectional slab reinforced with GFRP bars was analyzed nonlinearly using FEM software package ANSYS. From which, the variation laws of deflection of concrete bidirectional slab reinforced with GFRP bars and strain of GFRP bars with the changes of load were gained; the bearing mechanisms of concrete bidirectional slabs reinforced with GFRP bars and steel bars were compared. It was concluded that the deflection of concrete bidirectional slab reinforced with GFRP bars is larger than that of concrete bidirectional slab reinforced with steel bars, and the ultimate bearing capacity of concrete bidirectional slab reinforced with GFRP bars is also larger.Finally, it was found that the application of FRP bars concrete in shield driving is feasible. And the construction method of novel material shield-cuttable tunnel-wall system was introduced, which can be the reference for the practical projects.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods > Shield Law ( full- face excavation )
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