Analysis Of Warping DAM Seepage Flow Based On Finite Element Method

DAMS are important engineering measures of soil and water conservation in loess plateau.As the capacity of the warping dam depositting the sediment increased year by year,in held the same flood,water level will be increased with the increase of deposition increases,thus causes the warping dam seepage saturation line of uplift,seepage slope increases.When seepage slope is greater than the warping dam dam soil critical seepage slope,seepage deformation occurs,causing warping dam seepage failure,seepage failure is one of the loess plateau on common forms of damage.To carry out the warping dam seepage analysis and study,to explore and explain the warping DAMS,the factors influencing seepage field,seepage field distribution in prevent warping dam seepage failure,the soil and water conservation and guidance on engineering design is of great significance and practical value.Provided in this paper,using the formula method,the finite element method and ANSYS CFX software,and studied the different method,fixed number of year of the sedimentation and topography of warping DAMS in narrow channel seepage seepage line,seepage gradient and seepage problems such as the influence of the escape point,and draw the following conclusion:1,numerical simulation analysis based on ANSYS Workbench platform provided the CFX fluid technology works best.Formula method,comparative analysis principle is provided the finite element method,ANSYS CFX method: formula method in the process of analysis,the most traditional,is currently the best way to cognitive efforts,but the method using the traditional method of solving equations,it is difficult to deal with anisotropic soil,poor compatibility of different types of soil.Richard is finite element method(fem)method is novel,simple operation,but there is still no 3 d analysis function,less all-terrain warping dam seepage field modeling capabilities.Only exist in the provided ANSYS CFX all-terrain warping dam seepage analysis ability,and the corresponding precision is higher.2,under the condition of equal amount in the flood,with the increase of warping DAMS in the sedimentation,warping DAMS seepage escape point,seepage slope will increase,and increase the size of the larger.For the seepage stability of the warping DAMS have an adverse effect,so the design of warping DAMS,must carry out the corresponding calculation and checking,if necessary,corresponding measures of drainage design and the filter body,to reduce the seepage in the dam body line.3,the influence of the channel shape on the warping DAMS have(in this case,17.78%).This influence is mainly characterized by three aspects,(1)lifting effect,at the bottom of the bank slope increased on either side of the channel height,so that the warping dam seepage field in high rise;(2)the blocking effect,on both sides of the channel slope,if there is a sag effect at low water level is equal to the pool,can block the flow through,at the time of high water level ACTS as broad crested weir,lower saturation line height;(3)gathering effect,decrease the flow along the slope direction,gathered in the direction of the center line of the channel,increase seepage escape point elevation on the direction of centerline.