Study On The Three-dimensional Seepage Analysis And Seepage Control Measures For A Artificial Lake

With the concept of sponge city construction gradually deepening people's hearts and the continuous development of new technologies,artificial lake has become a new direction for many urban construction.As an important part of urban landscape,urban artificial lakes will cause the groundwater level in the adjacent area to change,resulting in uneven settlement of existing shallow buried foundation buildings,which will have negative impact on surrounding buildings and landscapes.This increases engineering management difficulty and management costs.Therefore,it is of great practical significance to carry out seepage control research on artificial lake.In order to quantitatively evaluate the distribution law of seepage field during the operation period of artificial lake and the effect of seepage prevention of anti-seepage measures,in this paper,combining with the proposed Kaifeng Yellow River Regulation Engineering of artificial regulation in lake,The saturated and unsaturated finite element seepage model is adopted to analyze the influence of seepage wall on the groundwater level and seepage flow around artificial lake under different working conditions,so that the basic characteristics of seepage in the lake area were understood,and reasonable seepage control measures were put forward,which provided an reference for seepage analysis of similar artificial lake.The main contents are as follows:(1)The theoretical basis of the finite element method for solving the saturated-unsaturated soil seepage problem is introduced.The basic concepts of seepage and saturated-unsaturated soil and the basic equations of seepage flow are briefly introduced.The mechanism of seepage analysis by ABAQUS software is discussed.The realization of seepage simulation in lake area is introduced in ABAQU software.(2)Combined with the hydrogeological data of the middle reaches of the Yellow River diversion project in Kaifeng City,a seepage model was established.The infiltration zone and permeability coefficient of the soil layer,the calculation of material parameters and boundary conditions of the model are determined,which provides a basis for the calculation of the seepage field during the artificial lake operation period.(3)Using the saturated-unsaturated seepage method,the finite element numerical model is applied to simulate the anti-seepage effect of vertical anti-seepage and horizontal anti-seepage of artificial lake.A two-dimensional seepage model is established to determine the calculation range of the model,master the basic characteristics of seepage,establish a three-dimensional seepage model to calculate and calculate the overall seepage behavior of the lake area,and simulate the seepage of the lake area under different anti-seepage schemes.(4)According to the calculation results of the two-dimensional and three-dimensional seepage models,analyze the changes of groundwater level,vector flow rate and leakage under the different working conditions without seepage prevention,construction of anti-seepage wall and horizontal clay anti-seepage,and evaluate the various defenses.The anti-seepage effect of the infiltration scheme recommends an economical and reasonable anti-seepage scheme.