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Mingxing Luo,Jiru Zhang,Xiaoxuan Liu,Cai Wu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8
Studies show that the shear strength of angular-shaped calcareous sand is mainly affected by dilatancy, interparticle locking, and particle breakage. In the present study, a series of consolidated-drained triaxial compression tests on calcareous sands are carried out to investigate the strength impacts of dilatancy, interparticle locking, and particle breakage. It is found that as the stress level increases, the friction angle difference reflecting the effect of the particle breakage increases. In contrast, the friction angle difference reflecting the interparticle locking and dilatancy effect decreases gradually. Moreover, the critical stress ratio of the high-angled calcareous sands decreases, which may be attributed to particle breakage. The obtained results demonstrate that when the stress level exceeds a certain value, the critical stress ratio remains constant. Then the correlation between the particle breakage, interparticle locking, and dilatancy effects in the shear strength is studied. Finally, based on the performed analysis on energy dissipation in calcareous sands, a dilatancy model is proposed that covers the particle breakage effect. The performed analyses demonstrate that the proposed model can accurately explain the experimental data.
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Pipeline transport of heavy crudes as stable foamy oil
Jie Sun,Jiaqiang Jing,Cheng Wu,Fei Xiao,Xiaoxuan Luo 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.44 No.-
A new idea was proposed to transport heavy crudes as foamy oil at normal temperature. The effects offoaming agent type and concentration, foam stabilizer type and concentration, oil–water volume ratioand temperature on the formation and stability of foamy oil were evaluated. The foamy oil properties anddrag characteristics of foamy oilflow in small diameter pipes were investigated. The results indicate thatthe prepared stable foamy oil could be characterized as non-Newtonian power lawfluid. The predictedpressure drops were in good agreement with the measured ones. The significant dynamic viscosityreduction rates were obtained.
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