Model Test And Particle Flow Analysis Of Ribbed Geomembrane Liner System

With the continuous development of modern society,the quality of life for the continuous improvement of human demand,garbage disposal has become the focus of attention.City life garbage disposal method is widely used at home and abroad mainly for sanitary landfill,while the modern landfill is most likely to occur along the liner system failure,it will not only cause environmental pollution and even endanger our health.Modern landfill liner system is mainly composed of geosynthetics and clay,in order to enhance the friction performance of liner system interface,improve the overall stability of the landfill,the design of ribbed geomembrane liner system,some experiments have proved that the use of ribbed geomembrane can change the interface roughness effectively,improve the stability of the liner system.In this paper,Based on the similarity theory,the indoor model test of ribbed geomembrane liner system was designed,the mechanism of PIV particle image analysis and flow numerical analysis software of ribbed geomembrane and geotextile in liner system impact on the overall stability of the model,provides the reference value for the research and use of the late liner the system in practical engineering.In order to study the influence of ribbed geomembrane and geotextile lining system on the overall stability of the model,based on the similarity theory,an indoor model test has been designed of ribbed geomembrane liner system,by changing the rib height,rib spacing and rib shape,comparative analysis of the three kinds of factors should be the force of the liner system model of the settlement and additional stress.The experimental results show that the use of ribbed geomembrane can effectively improve the friction performance of liner system interface,limiting soil deformation,reduce settlement of overlying soil,and by changing the rib height and rib spacing,rib spacing and rib height are the optimal value,The reinforcement effect is directly proportional to the rib spacing and the rib height,when they has not reached the optimal value;The additional stress distribution of the model is more uniform than that of the smooth geomembrane,so that the inner part of the model is in the upper part of the load and the bearing capacity of the model is enhanced.This article through PIV particle image analysis method,study the particles inside the liner system of displacement and velocity field distribution,through the micro analysis we found that near the ribs will form a "indirect effect area",the influence of sand displacement inside the area is smaller,influence area between the ribs will influence each other to diffusion so that reinforce the model.Based on the indoor model test,Discrete element analysis of particle flow was carried out on the liner system,The contact force and displacement vector diagram of smooth geomembrane and ribbed geomembrane model are compared and analyzed.Study on the mechanism of reinforced geomembrane liner system;simulation by numerical analysis of indirect effects of rib area and PIV results,and through the simulation of settlement and stress,and that the rib height of reinforced geomembrane and stiffened spacing have the optimum value.