Research On Seepage Control Measures Of Chengzi River Floodgate Foundation

In hydraulic engineering,the damage of water flow to hydraulic structures comes from two aspects:surface water and ground water,and the seepage phenomenon of sluice foundation formed by ground water is invisible.The seepage damage is difficult to be found in the first time which could cause seepage damage in the hydraulic engineering and once that happens,it could be very serious.Located in the north Jiangsu Depression,the Chengzi river floodgate has been classified as a key seismic hazard monitoring area by the China Earthquake Administration since 1990 due to its complicated geological conditions.It is necessary to study the seepage prevention measures of Chengzi river sluice gate Foundation in order to reduce the influence of seepage on the project.In this paper,the seepage characteristics of Chengzihe Floodgate Foundation are studied from the aspects of sand channel model test and numerical simulation,and the relationship between the height of anti-seepage pile and seepage flow is studied The main research contents are as follows:1.The basic theory of seepage flow research,the finite element method for numerical simulation of seepage flow and the similarity criterion for sand tank model test are briefly described.2.Based on the Chengzi river sluice gate project,according to the conditions of the test site and according to a certain scale,sand channel model of the sand flume is established The seepage head is measured by a piezometer connected to a measuring point on one side of the sand channel model.In the study of pressure seepage,three kinds of anti-seepage piles with different properties are analyzed,which are concrete pouring pile,steel sheet pile and expansion cast-in-place pile,Compared with the other two kinds of anti-seepage piles,the expansion cast-in-place pile has better anti-seepage effect under the foundation of Chengzi river sluice gate,and can reduce the seepage gradient and the seepage flow per unit width better.3.The two-dimensional seepage Seep/W module in Geo-Slope software is used to simulate the foundation of Chengzi river sluice gate.By comparing the results of numerical simulation and sand channel model test,it is found that the variation trend of seepage pressure head of the two is basically the same along the way The error is analyzed in this paper.4.The height of anti-seepage pile is optimized by using Geo-Slope software,and the difference of seepage head,seepage flow and other seepage characteristics of anti-seepage pile under different heights is analyzed The relationship between pile depth,pore water pressure and seepage flow per unit width is studied.