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- 저자 : Wenfeng Zhou (검색결과 4 건)
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Wenfeng Zhou,Shaoming Liao,Yanqing Men 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.3
Long-term leakage at the tunnel joint induces significant tunnel deformations, which in turn aggravates the joint leakage. A finite element model (FEM) model with a defined leakage element incorporated in a segmental joint is developed to investigate the evolution of joint leakage and deformation. Subsequently, a series of parametric analyses are conducted to reveal the time-dependent law of joint opening and leakage variation with leakage location, water head, and waterproof capacity based on Qiongzhou Strait tunnel. The results show that the interaction between joint opening and leakage undergoes a dynamic evolution process during the long-term operation of the tunnel. It is found that the joint opening on the extrados is much more critical and hazardous than that on the intrados, and the synthetic action of water head and waterproof capacity can remarkably delay the development of joint opening and leakage. For Qiongzhou Strait tunnel, the joint opening on the extrados occurs after at least 30 years of initial leakage at the springline and increases to 1.28 mm, and the leakage rate increases from 0.909 × 10−4 m3/d to 1.508 × 10−4 m3/d after 120 years. It is suggested that the waterproof capacity and initial leakages near the springline should be strictly controlled to ensure the long-term safety of the tunnel.
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A hybrid numerical simulation method for typhoon wind field over complex terrain
Wenfeng Huang,Huanlin Zhou 한국풍공학회 2014 Wind and Structures, An International Journal (WAS Vol.18 No.5
In spite of progress in the numerical simulation of typhoon wind field in atmospheric boundary layer (ABL), using typhoon wind field model in conjunction with Monte Carlo simulation method can only accurately evaluate typhoon wind field over a general terrain. This method is not enough for a reliable evaluation of typhoon wind field over the actual complex terrain with surface roughness and topography variations. To predict typhoon wind field over the actual complex terrain in ABL, a hybrid numerical simulation method combined typhoon simulation used the typhoon wind field model proposed by Meng et al. (1995) and CFD simulation in which the Reynolds averaged Navier-Stokes (RANS) equations and k-e turbulence model are used. Typhoon wind filed during typhoon Dujuan and Imbudo are simulated using the hybrid numerical simulation method, and compared with the results predicted by the typhoon wind field model and the wind field measurement data collected by Fugro Geotechnical Services (FGS) in Hong Kong at the bridge site from the field monitoring system of wind turbulence parameters (FMS-WTP) to validate the feasibility and accuracy of the hybrid numerical simulation method. The comparison demonstrates that the hybrid numerical simulation method gives more accurate prediction to typhoon wind speed and direction, because the effect of topography is taken into account in the hybrid numerical simulation method.
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A hybrid numerical simulation method for typhoon wind field over complex terrain
Huang, Wenfeng,Zhou, Huanlin Techno-Press 2014 Wind and Structures, An International Journal (WAS Vol.18 No.5
In spite of progress in the numerical simulation of typhoon wind field in atmospheric boundary layer (ABL), using typhoon wind field model in conjunction with Monte Carlo simulation method can only accurately evaluate typhoon wind field over a general terrain. This method is not enough for a reliable evaluation of typhoon wind field over the actual complex terrain with surface roughness and topography variations. To predict typhoon wind field over the actual complex terrain in ABL, a hybrid numerical simulation method combined typhoon simulation used the typhoon wind field model proposed by Meng et al. (1995) and CFD simulation in which the Reynolds averaged Navier-Stokes (RANS) equations and k-${\varepsilon}$ turbulence model are used. Typhoon wind filed during typhoon Dujuan and Imbudo are simulated using the hybrid numerical simulation method, and compared with the results predicted by the typhoon wind field model and the wind field measurement data collected by Fugro Geotechnical Services (FGS) in Hong Kong at the bridge site from the field monitoring system of wind turbulence parameters (FMS-WTP) to validate the feasibility and accuracy of the hybrid numerical simulation method. The comparison demonstrates that the hybrid numerical simulation method gives more accurate prediction to typhoon wind speed and direction, because the effect of topography is taken into account in the hybrid numerical simulation method.
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Dynamic Unloading Instability Mechanism of Underground Cavern Based on Seepage-Damage Coupling
Li-Ping Li,Wenfeng Tu,Zongqing Zhou,Shao-shuai Shi,Mingguang Zhang,Yuxue Chen 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.5
The seepage-damage coupling effect will aggravate the instability of the surrounding rock during the unloading process of underground cavern excavation. Considering this coupling effect and excavation disturbance, the theoretical solution of the stress state of surrounding rock is derived by using the elastic-brittle damage model. The dynamic criterion of the instability and water inrush is presented. Based on the theoretical derivation, the calculation program for the seepage-damage analysis of the surrounding rock under dynamic unloading is programmed, and the seepage flow and the radius of the damage zone of the surrounding rock are calculated. By analysing the variation of radius of the damaged zone with pore water pressure and excavation radius under different calculation conditions, the influence of dynamic unloading disturbance on the damaged zone of the surrounding rock is discussed. The radius of the damaged zone increases with the pore water pressure and excavation radius. Considering the effect of dynamic unloading, the calculation result of the damaged zone radius and seepage discharge of underground cavern are much larger than the theoretical calculation and coupling calculation of seepage-damage without dynamic unloading. Research methods and results can provide guidance and reference for similar engineering research.
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