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This article deals with the solute transport in a single fracture with the combination of the Lattice Boltzmann Method (LBM) and Modified Moment Propagation (MMP) method, and this mixed method is proved to have several advantages over the LBM and Moment Propagation (MP) mixed method which leads to negative concentrations under some conditions in computation. The disadvantage of LBM/MP has been overcome to a certain extent. Also, this work presents an LBM solution of modeling single fractures with uniformly or randomly distributed grains, which can provide a new path of applying the LBM in solute transport simulation in fractures.  相似文献
2.
SOLUTE TRANSPORT IN NATURAL FRACTURES BASED ON DIGITAL IMAGE TECHNOLOGY   总被引:2,自引:2,他引:0  
A method of fracture boundary extraction was developed using the Gaussian template and Canny boundary detection on the basis of the collected digital images of natural fractures. The roughness and apertures of the fractures were briefly discussed from the point of view of digital image analysis. The extracted fractured image was translated into a lattice image which can be directly used in numerical simulation. The lattice Boltzmann and modified moment propagation mixed method was then applied to the simulation of solute transport in a natural single fracture, and this mixed method could take the advantages of the lattice Boltzmann method in dealing with complex physical boundaries. The obtained concentrations was fitted with the CXTFIT2.1 code and compared with the results obtained with the commercial software Feflow. The comparison indicates that the simulation using the mixed method is sound.  相似文献
3.
人工降雨入渗边坡破坏试验研究   总被引:1,自引:0,他引:1  
建立室内人工边坡的降雨入渗模型,选取坡度为33.7°的细砂边坡,在300 mm/h降雨强度下进行试验.通过孔隙水压力传感器和自制含水率传感器监测试验中含水率、孔隙水压力的变化规律和分布情况及对边坡稳定的影响,分析边坡表层以下4 cm及14 cm深处的含水率、孔隙水压力变化和3个时刻坡体的含水率、孔隙水压力等值线图.分析结果表明,降雨入渗的整个过程中,下部的含水率、孔隙水压力都是最大的;边坡内部靠近底层的区域,其含水率和孔压的变化需考虑趾部及下部水分入渗的影响,因为这些影响会造成该区域的等值线密集.  相似文献
4.
On the basis of the generalized physical model of the riverbank, the experiments were conducted to study the mechanisms of riverbank failure under the coupling effect of seepage flow and river flow. The experimental setup was specially designed, as well as test point location, parameters and procedures, and the main influencing factors were analyzed affecting riverbank failure based on the failure types, the variations of pore water pressure and soil displacement. The results indicated that the coupling effect has different influences on the bank failure in three aspects: the failure type, the process and the extent. In addition, the river flow played a more important role than the seepage flow in the coupling effect on the bank failure.  相似文献
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