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1. Study on the interval laws of water flow in over-broken rock mass | |||
LIU Weiqun,FEI Xiaodong,FANG Jingnian | |||
Mechanics 13 June 2011 | |||
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Abstract:Based on the steady-state seepage method, we used the Mechanical Testing and Simulation 815.02 System and a self-designed seepage instrument for over-broken stone to measure seepage properties of water flow in three kinds of crushed rock samples. Three confidence interval methods of describing permeability coefficients were given: secure interval, computative interval and systemic interval. The lower bound of secure interval can be applied to water-inrush and the upper bound can solve the problem of conductivity. For computative interval, as the axial pressure increases, the length of confidence interval is shortened, and the upper and lower bound are reduced. As to systemic interval, the length of confidence interval, as well as the upper and lower bound, varies evidently under low axial pressure and punily under high axial pressure. These three methods provide useful consultations and references for analyzing the permeability coefficient of over-broken rock. | |||
TO cite this article:LIU Weiqun,FEI Xiaodong,FANG Jingnian. Study on the interval laws of water flow in over-broken rock mass[OL].[13 June 2011] http://en.paper.edu.cn/en_releasepaper/content/4432327 |
2. A study of upper limit of solid scatters’ density for gray Lattice Boltzmann Method | |||
Yong-Li Chen,Ke-Qin Zhu | |||
Mechanics 07 March 2008 | |||
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Abstract:The upper limit of solid scatters’ density , a key parameter for simulation of flows in porous media with a gray Lattice Boltzmann Method, is studied by an analytical way for the infiltration Poiseuille flow between two parallel plates. Analyses of three different gray Lattice Boltzmann schemes, respectively proposed by Balasubramanian et al, Dardis & J. McCloskey and Thorne & Sukop, indicate that the effective domain of Balasubramanian’s scheme is restricted to , Dardis & McCloskey’s scheme is restricted to , and that there is no extra restriction on with Thorne & Sukop’s scheme. These results are obtained for the dimensionless relaxation time . The above analytical results are verified by our numerical simulations. A case relating the flow at the interface of a porous medium is given and the result obtained by the gray LBM agrees with the Brinkman’s prediction well. | |||
TO cite this article:Yong-Li Chen,Ke-Qin Zhu. A study of upper limit of solid scatters’ density for gray Lattice Boltzmann Method[OL].[ 7 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19127 |
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