Based On Geo-Studio And Flac3d Earth-Rock Dam Gluing Splicing Geomembrane Characteristics Research

The defective geomembrane caused by puncture or splicing reduces the performance of the impermeable structure,and the welding method and cementation method are the main technical means of repair at present,because the welding method has problems such as missing welding and carbonization,and the project actually gradually tries to repair by cementation.In view of whether the hydraulic and mechanical properties of geomembrane repaired and spliced by cementation method meet the requirements of the specification,this paper uses experimental and numerical simulation analysis methods to carry out the research on the characteristics of glue splicing and damage repair geomembrane,and the main research results are as follows:(1)The results of the impermeability test of glue repair/splicing geomembrane show that the r/R value is inversely proportional to the permeability coefficient,and the pressure head is inversely proportional to the permeability coefficient,and appropriately increasing the lap width can effectively reduce the leakage amount;The results of glue repair/splicing mechanics show that glue repair and increasing the splicing width increase the tensile strength and elongation of the damaged geomembrane,but the tensile strength is lower than that of the lossless geomembrane.(2)The two-dimensional numerical model seepage flow results of gluing repair damaged geomembrane show that repairing geomembrane can significantly reduce the elevation and overall infiltration flow rate of the wetting line after membrane,and the numerical simulation analysis results of tensile deformation show that the cementation method reduces the damage degree of repaired geomembrane to a certain extent.The results of the gluing geomembrane model show that the larger the lap width,the more obvious the anti-seepage effect of lap joint.(3)The three-dimensional numerical simulation seepage analysis of the damaged geomembrane repaired by gluing showed that the repair rate was proportional to R/R,and the seepage result was not much different from the two-dimensional seepage result;The mechanical analysis shows that the three-dimensional model can simulate the force state of the isodirectional tension deformation in the plane of the geomembrane,which is more in line with the engineering reality than the two-dimensional model.(4)The three-dimensional numerical simulation analysis of the splicing geomembrane by gluing method shows that the larger the lap width and lap rate,the more obvious the antiseepage effect;There is no tensile failure under different working conditions of the gluing method splicing geomembrane under normal operation of the project,indicating that the mechanical properties of the gluing method splicing geomembrane meet the engineering requirements.