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RISS 인기검색어
- 검색키워드
- 저자 : Helin Fu (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Calculation of the Allowable Drainage of Parallel Tunnels Based on Ecological Environment Protection
Helin Fu,Pengtao An,Guowen Cheng,Shujie Wen,Jie Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5
To determine a reasonable value of parallel tunnel drainage, a steady-flow calculation model is established. The differential equilibrium equation of seepage is established, and the equation of the falling funnel curve in a steady state with drainage parameters is solved by using boundary conditions. The maximum drawdown depth of the control point is used to calculate the allowable discharge of the tunnel. Then, the curve equation of the falling funnel is determined, the volume of the drainage funnel is calculated, and the total discharge in the steady state is calculated according to the water storage coefficient. Finally, the theoretical formula is verified based on an engineering case and numerical simulation. Considering the actual engineering geology and hydrogeological conditions of the tunnel site, the total drainage, allowable drainage, and initial support bearing head height calculated with the proposed method are different from the actual measurements collected on site by 10%, 18.9% and 13.6%, respectively. Therefore, the calculation method can provide a reference for similar engineering.
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Helin Fu,Jie Li,Guoliang Li,Jingjun Chen,Pengtao An 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
The Sejila tunnel, part of the Sichuan–Tibet railway, is in a complex geostress environment because of its deep burial depths and tectonic movement. Based on the measured stress data combined with the structural history and features, the stress characteristics of the Sejila area are preliminarily identified. Then, a three-dimensional numerical model that can provide real topographic features is established, and a distribution law of stress boundary conditions is proposed according to compilations of much measured stress data. By means of support vector regression (SVR), the stress field of the whole Sejila region is determined and finds a reasonable accordance with the measured stress data. Results show that the vertical stress in deep buried stratum can be approximately regarded as one of the principal stresses, and it is reasonable to apply the lateral stress to the model boundary according to a linear function with burial depth. The in situ stress in the tunnel site exhibits that σH > σV > σh, and the σHdirection deflects when it encounters faults or strata interfaces; the larger that the intersecting angle between fault strike and σH is, the smaller the deflection. Compared to the entrance, the rear of the tunnel is subjected to a high maximum principal stress with a high angle; moreover, most sections of the tunnel are estimated to suffer from severe rockbursts, except for a range of 5 km away from the tunnel entrance and 2.5 km away from the exit, according to the Russense criterion. This paper can provide the basis for the prediction and prevention of rockbursts in the Sejila tunnel.
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Deformation Response Induced by Surcharge Loading above Shallow Shield Tunnels in Soft Soil
Zhen Huang,Hai Zhang,Helin Fu,Shaokun Ma,Ying Liu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.8
In the case of sudden surcharge loading, shallow shield tunnels in areas with soft soil experience substantial deformation responses. It is very important to understand the different loading modes and control measures above the shallow shield tunnels in soft soil for improving the safety of tunnel structure and reducing the influence of deformation. In this study, a three-dimensional numerical model of shallow shield tunnels in soft soil is established with FLAC3D. Ground and tunnel deformations are analyzed under different loading modes, and the effects of different deformation control measures are also studied. The numerical simulations in this paper show that the surface and tunnel deformation responses vary when induced by different loading modes above shallow shield tunnels in soft soil. After surface hardening with a 20-cm-thick layer of C20 concrete, the surface settlement is effectively controlled, and the uneven longitudinal settlement of the tunnel vault is improved. However, controlling the height of the surcharge is the most direct deformation control method. When the height of the surcharge is reduced from 6 m to 4 m and 2 m, the maximum ground settlement is reduced by 37.8% and 69.4%, respectively, and the maximum longitudinal settlement of the tunnel vault is reduced by 35.3% and 65.2%, respectively. During the operation of shallow shield tunnel in soft soil area, sudden surcharge loading should not be allowed. In the inevitable case, the surcharge loading on one side of the tunnel should be prevented and the surcharge loading height should be strictly limited.
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Jianbing Lv,Xulong Li,Zhanrong Li,Helin Fu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.1
In the process of building subways in many cities, the technology of shield tunneling has become more widely used. In large cities, it is inevitable for the tunnels to pass through the foundations of buildings or between deep piles of bridges. Due to the many restrictions on urban space in China, the clearance between two tunnels has also become smaller. Hence, it is an urgent technical problem to resolve the mutual influence of the close construction of two tunnels using shield technology. In this study, the shield construction project of two tunnels with a small clearance of 2.6 m has been analyzed. The project is between Tongdewei Station and Shangbu Station in the northern extension section of the Guangzhou Metro Line 8. The main parameters used in the analyses are the tunnel lining deformation and the ground settlement. The construction without and with the isolation pile reinforcement have been simulated numerically. The simulation results have been compared with the on-site monitoring data. Based on the comparison, it shows that with the reinforcement, the tunnel lining deformation and the ground settlement can be reduced significantly. The effect of subway shield construction on the construction of the first subway tunnel will significantly reduce. The deformation of the shield excavation net width and the mutual influence can also be greatly reduced. The findings from this study can be used as technical foundation and reference for the construction of similar projects, i.e. shield tunnel construction with a small clearance between tunnels.
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