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- 저자 : Haitao Bi (검색결과 2 건)
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Modified Slip Surface Stress Method for Potential Slip Mass Stability Analysis
Haitao Zhang,Xianqi Luo,Jinfeng Bi,Zijing Guo 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.1
A modified slip surface stress method is proposed with the concept of vector sum and rigorous force analysis. Theoretically, the proposed method could degenerate into the existing methods by adding the corresponding assumptions. Through five typical slope cases, comparisons are made among the Factor of Safety (FoS) calculated by the proposed method and others. Results show that the proposed method could evaluate slopes at the limit state. Moreover, the proposed method is capable to calculate the FoS of the potential slip mass for both homogeneous and heterogeneous cases with regular or irregular slip surface in both two- and three-dimension spaces. Also, the proposed method could give the potential slip direction of a slope, which is useful for the design of measures to reinforce the slope.
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Zhengfang Ye,Lili Cui,Qingqiang Meng,Haitao Bi,Lincheng Zhou 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
We studied the simultaneous removal of Pb(II) and chemical oxygen demand (COD) from synthetic solutions using immobilized microorganism. The immobilized microorganisms on polyurethane foam (IPUF) were successfully prepared by cultivating the microbe B350 in a mixture of culture medium and polyurethane foam (PUF). The adsorption of Pb(II) ion from aqueous solutions onto PUF and IPUF was studied by batch adsorption. IPUF exhibited high Pb(II) removal efficiency. When 0.12 g of IPUF was used to treat 50mL of 20mg/L P(II) solution at pH 7.0 and 25 oC for 120 mins, the removal ratio was 80%. The biosorption kinetics could be described by the pseudo-secondorder model, and the adsorption isotherms could be described by Langmuir and Freundlich equations. In addition, for synthetic wastewater containing Pb(II) and C6H12O6, the removal ratios of Pb(II) and COD after being treated by IPUF for 8 hours were 92.0% and 84.2%, respectively. The removal ratio of COD clearly decreased with the increase of Pb(II)concentration, meaning that Pb(II) was toxic to the mobilized microorganisms and lower Pb(II) concentration was preferred.
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