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Simulation procedure of unconfined seepage with an inner seepage face in a heterogeneous field

Science China(Physics,Mechanics & Astronomy) 2013年第6期56卷 1139-1147页

作者： WU MengXi YANG LianZhi YU Ting Institute of Mechanics Chinese Academy of Sciences Hydrochina Chengdu Engineering Corporation

An inner seepage face phenomenon is given and a numerical simulation procedure has been *** may appear at the interface of two materials when an unconfined seepage flows from a porous media to a coarser porous media with a higher *** and divergent problems may arise both in a saturated-only and in a variably saturated analysis while an inner seepage face is not simulated with a special *** position of the seepage face is determined during the nonlinear iteration process and the flux of the inner seepage face nodes is transferred to the downstream side *** and efficiency of the procedure are illustrated by the simulation of two dimensional steady state seepage examples of heterogeneous zoned dams which is usually used to validate *** analysis of a three-dimensional earth core rockfill dam is also presented *** procedure can also be applied to general transient seepage problems.

关键词： unconfined seepage inner seepage face finite element method free surface

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Theory of Combined seepage Applied to Dewatering Systems

引用

Journal of Water Resource and Protection 2016年第7期8卷 743-755页

作者： Magdy M. Aboelela Irrigation Engineering and Hydraulics Department Faculty of Engineering Alexandria University Alexandria Egypt

In the present study, an analytical solution is presented to solve the problem of combined seepage, under a sheet piling cofferdam, applied to dewatering systems. Existence of the sheet pile creates a confined seepage followed by an unconfined seepage in the same field, which presents a combined seepage problem. Two equations were developed to analyze the combined seepage underneath a sheet piling wall. Using such equations, both the maximum height of the free surface just behind the sheet piling cofferdam (Ho) and the quantity of seepage discharge to be pumped out from the construction site (q) can be determined. The main parameters affecting the combined seepage characteristics underneath a sheet piling wall are: The depth of permeable foundation layer (T), the horizontal distance behind the sheet pile (X), the depth of excavation in the construction site (D), the embedded depth of sheet pile (S), the retained water head (H1), the accumulated seepage water depth (H2), and the side slope factor of excavation line (M). Study showed that, the above parameters have a great effect on the combined seepage, but with different extents.

关键词： Confined seepage unconfined seepage Combined seepage Sheet Piling Cofferdam seepage Discharge Phreatic Surface

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