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- 저자 : Tiejun Yao (검색결과 2 건)
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The Influence of Non-synchronous Excavation of Twin Curved Shield Tunnels
Shaohua Li,Changfu Huang,Tiejun Yao,Pengfei Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5
The theoretical model of twin curved shield tunnels and refined numerical model considering the characteristics of wedge-shaped segment ring joints were established in this paper. Two construction schemes of taking the inner side or outer side of the twin curved tunnels as the first tunnel were conducted for comparison. Then two main characteristics of curved tunnel construction (over-excavation and yaw excavation loadings) were taken as variables to explore their response to the approaching construction caused by unsynchronized driving of twin curved shield tunnels. The ground surface settlement troughs obtained by the analytical solution and numerical simulation are in good agreement with the monitoring result. On the condition that the curved tunnel at the inner side is taken as the first tunnel, the excavation will intensify the ground settlement and the internal forces of its segment. In the case that the overcutting gap is not of large volume, it is advisable to first excavate the curved tunnel at the outer side, and then construct the curved tunnel at the inner side. The influence of soil loss on the ground disturbance is greater than that of construction loadings. The excessive overcutting gap not only easily induces a sharp increase in the ground vertical displacement, but also may lead to the movement of soil at the inner and middle sides towards the inner side of the curved tunnels, and causes the soil at the outer side to move towards the outer side of the curved tunnels. Remarkably, excessive overcutting gap may lead to large horizontal displacements of the ground surface.
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Highly Porous Cellulose Microbeads and their Adsorption for Methylene Blue
Jiarui Hua,Ranju Meng,Tiejun Wang,Huiying Gao,Zhenze Luo,Yuanyuan Jin,Lin Liu,Juming Yao 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4
Highly porous cellulose microbeads with porosity of more than 90 % were successfully prepared via a faciledissolution and subsequent regeneration of cellulose in H2SO4/Na2SO4 coagulation bath. Effects of coagulation temperature,H2SO4, and Na2SO4 concentration on the microstructure, average diameter, porosity, specific surface area, and mechanicalproperty of formed cellulose beads were investigated systematically. In view of the high porosity and specific area, thecellulose beads were used as adsorbents for dye removal. The results revealed that the porous cellulose beads exhibited highadsorption performance with maximum adsorption capacity of 48.80 mg/g for cationic dye methylene blue. Besides, theporous cellulose beads also presented a potential in practical application and its adsorption capacity for methylene blue stillretained 29.43 mg/g after six adsorption-desorption cycles.
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