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- 저자 : Zhenwei Ye (검색결과 2 건)
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Tingjin Liu,Shuyi Zhang,Yongfeng Tang,Zhenwei Ye 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.1
This paper investigates the longitudinal behavior and failure pattern of shield tunnel, as well as the reinforcement mechanism of longitudinal channel steel, using reduced-scale tunnel models assembled with 24 lining rings. The longitudinal behavior of the shield tunnel and the reinforcement effect are discussed in terms of vertical deformation, joint deformation, and concrete cracking. The results indicate that the shield tunnel without reinforcement longitudinallydeforms in a “bending and dislocation” mode, with the failure pattern dominated by bending deformation. In contrast, the failure pattern of the shield tunnel reinforced by channel steels is characterized by brittle shearing dislocation fracture of the circumferential joint. The load at which damage occurs in the reinforced tunnel model is 1.74 times and 2.04 times that of the non-reinforced staggered and straight jointed tunnels. The reinforcement reduces the horizontal convergence discrepancy of lining rings above the soft foundation spring and the adjacent lining rings, which improves the overall integrity of the tunnel structure.
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Microflame diffusion properties of AP/HTPB propellant under binder width effects
Kaixuan Chen,Xiaochun Xue,Yonggang Yu,Zhenwei Ye 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.2
The present study proposes a method to estimate the microflame properties of ammonium perchlorate/hydroxyl-terminated polybutadiene (AP/HTPB) propellant at different binder widths. A 3D random particle packing is generated by the Monte Carlo method. A transformation from Miller packing to sandwich model is used by the dual slicing technique. The gassolid coupling model and the two-step BDP flame model in the combustion field are established to study the influence of kinetic chemical and fluid diffusion process on the micrflame properties. Finally, the mathematical relationships of the burning rate br and the final flame height H 3on the HTPB thickness D are obtained by analyzing and fitting combustion processes of multiple AP/HTPB propellants, namely, b+1.22D 2 -13.07D+67.73.
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