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Luo N.,State Key Laboratory for Geomechanics and Deep Underground Engineering CUMT | Luo N.,Peking University | Luo N.,Beijing Institute of Technology | Shen H.,Peking University | And 3 more authors.
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2013

An improved space-time conservation element and solution element (CE/SE) scheme with a chemical reaction models-two-step reaction model were constructed by proposing a new structure of solution elements and conservation elements based on the rectangular mesh. Numerical simulation results describe that the physical and chemical characteristics of the multi-gas phase flows such as the density of gas, velocity of wave, temperature and pressure are 6.4 kg/m3, 1580 m/s, 7 MPa and 2560 K, respectively. The results show that the improved CE/SE scheme and the two step reaction model is easy to be implemented and high accurate for nanoparticle growth during the gas-phase detonation reaction process.


Lu Y.,State Key Laboratory for GeoMechanics and Deep Underground Engineering CUMT | Lu Y.,China University of Mining and Technology | Zhou G.,State Key Laboratory for GeoMechanics and Deep Underground Engineering CUMT | Zhou G.,China University of Mining and Technology | And 4 more authors.
Advanced Materials Research | Year: 2011

This For mastering the effect of particle size to strength and deformation characteristics of sand under high pressure, DRS-1 high pressure direct shear test system is used in shear test for 3 groups of sand under pressure of 12 to 15 MPa. Through analysis of the test results, it is obtained that standard sand under high pressure shows strain hardening and volume contraction characteristics. The relationship curves of stress-strain and volume contraction-shear strain appear as hyperbola, they can be simulated by Duncan-Chang hyperbolic model. Sand with small particle size has better group, greater density and higher strength, but the shear contraction is not obvious. Sand with poor group has particle crushing under high pressure, which makes the soil particles rearrange and then the average porosity decreases at the same time large pores disappear, so finally it shows a more significant shear contraction characteristic. © (2011) Trans Tech Publications.


Yong L.,State Key Laboratory for GeoMechanics and Deep Underground Engineering CUMT | Yong L.,China University of Mining and Technology | Guoqing Z.,State Key Laboratory for GeoMechanics and Deep Underground Engineering CUMT | Guoqing Z.,China University of Mining and Technology | And 3 more authors.
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings | Year: 2011

For mastering the strength and deformation properties of sand under high pressure, DRS-1 high pressure direct shear test system was used in shear test of Fujian standard sand under 12 to 15 MPa. Through analysis of the test results, we obtained that shear properties of standard sand under high pressure show strain hardening, it is consistent with Duncan-Chang hyperbolic model. There is a proportional relationship between shear stress and vertical stress n while s becomes infinite, which is obtained from the relationship between s/ and s. Under high pressure, the friction coefficient of standard sand's shear failure surface increases with shear strain. The value does not change with vertical stress n and the final stable value is about 0.46. Shear properties of standard sand under high pressure show volume contraction which can also simulated by Duncan-Chang hyperbolic model. The relationship between volume contraction v and n is similar to Mohr - Coulomb criterion when the sand sample is damaged. © 2011 IEEE.

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