Study On Seepage Flow Analysis And Drainage Program Optimization Research Of Nazixia Hydropower Station

Rational development and utilization of water resources can bring enormous benefits.At the same time,it can reduce disaster.So,human built a large number of water conservancy project.In all these projects,Concrete face rock fill dam has been vigorous development cause of the low cost and short construction period.Due to the seepage and infiltration problems,some Concrete face rock fill dams had collapsed in domestic and foreign.And the collapsed had caused severe life and property losses.Nazixia hydropower station is a large hub works to electric power generation.And it s located in the upper Duolong river Qilian county which near to the Nazixia exit.The dam is a concrete face rock fill dam built on the cover.So based on the theory of saturated-unsaturated seepage flow and finite element calculation of Nazixia hydropower station's sand-gravel dam and foundation seepage stability,we can evaluation of the rationality of the anti-seepage drainage system layout.And we can make optimization recommendations.By natural groundwater flow field calculation analysis shows that this finite element calculation stimulate the hub area of the engineering geology and,rock partitions.This simulation of natural groundwater distribution meets the actual situation.So,this model can be use to study the run-time analysis of seepage field and drainage etc.It can summed up the seepage analysis during the normal water,design flood and check flood,that distribution of different working conditions with seepage field of dam site is specific flows downstream through impervious curtain of dam and both sides of the mountain.In different working conditions,Concrete face rock fill dam has a much bigger osmotic gradient.And the osmotic gradient in the other dam feed zone is more smaller.It can meet stability penetration requirements which dam body and foundation's maximum osmotic gradient is less than the zone's allows permeable gradient.At the normal water dam,upstreamdownstream water and osmotic gradient and seepage flow are largest.By the calculation of drainage layout optimization,the YH-2 plan(E-type layout plan,lower elevation)should be used to calculate the running period of seepage field.During this calculation we can see that upstream and downstream water decreased in the dam area,and both sides of the dam shoulder seepage flow decrease.In all seepage flow,there has a small proportion of dam body seepage flow.The most proportion of seepage flow is producing by the dam foundation and both sides of dam shoulder.And the most seepage flow gradient is less than the permission of material seepage flow gradient which meets the requirements.