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RISS 인기검색어
- 검색키워드
- 저자 : Shaoming Liao (검색결과 3 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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Junzuo He,Shaoming Liao,Yong Tan,Mengbo Liu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.1
Pipe-roof Pre-construction Method (PPM) is a pre-reinforcement method widely adopted in shallow large section tunnelling in the urban area. As one of the key indexes needed to be controlled, ground surface settlement and axis deviations induced by pipe-roof tunnelling attract increasing attention, but the interaction between socketed pipes (ISP), including shielding and constraint effects, has been lack of consideration in practice. By incorporating deformation coefficient and deviation coefficients, this paper proposed a new analytical method to account for the effect of ISP on the ground movement. Then, a numerical model to consider ISP and sequential jacking process was established and a series of simulations were carried out for a large pipe-roof tunnelling project. By comparing with the analytical results, the deviation coefficients were determined for the proposed model and the effect of ISP on the surface settlement was further revealed. Finally, the rationality and effectiveness of the proposed method were confirmed by contrasts with traditional methods and numerical calculations. The results show that an approximately 37% error rate could be reduced by the new method. This research is helpful for a better understanding of the effect of ISP, and therefore benefits the effective prediction and control of the surface settlement induced by pipe-roof tunnelling.
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Yongzhi Wang,Mengbo Liu,Shaoming Liao,Qiong Yi,Junzuo He,Linqi Liu,Zhiqun Gong,Kaiying Li 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5
Press-in open caisson method, which sinks into soil with the aid of mechanical pressure without excavation, is becoming an important method of construction in extremely soft foundations. However, many engineering problems are prone to occur in the construction of caissons, such as sinking and large deformation. In this study, the stratigraphic response model, such as soil migration during the press-in process of open caisson, is focused on. Through model tests of soil and caissons, the migration patterns of each part of the soil were carried out, and the mechanism underlying the stratigraphic response pattern was investigated. The three primary conclusions are as follows: 1) The bottom edge foot of caisson produces lateral extrusion on surrounding soil in the range of 10 cm (20%H) below, resulting in lateral movement of soil. 2) two kinds of plug, i.e., “wedged” and “unwedged” plugs exist, and the driven forces for the soil migration can be divided into three stages, i.e., caused by soil plug with active arch, by soil plug with passive arch and caused by soil squeezing effect. 3) there is a significant linear correlation between the soil plug changes, the horizontal movement of the deep soil body, and the displacement of the surface uplift. The soil plugging effect and squeezing effect are interacted and enhanced with each other. This study provides a new understanding of the stratigraphic response in the construction of press-in open caissons, andguides safety control of open caissons construction.
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