พฤติกรรมกลไกภายในระหว่างอวน HDPE กับดินทรายด้วยเครื่องทดสอบการเฉือนตรงขนาดใหญ่

Abstract

The fishnet made by High Density Polyethylene or HDPE used widely in the fishing industry was studied the possibility for introducing as a material for tensile reinforcement of soil deposit. This fishnet can be a fiber which is sustainable into nonwoven geogrid for various geotechnical engineering applications especially the embankment construction. The 7 types of fishnet used for this study were investigated experimentally. Large scale direct shear test was carried out for investigating the interaction behaviors between fishnet geogrid and sand. Locally available silty sand was used as a backfill material in the experiments. The sand was dried by the oven for 24 hours before testing. The sand backfill materials were under different normal confining pressures of 0.28, 0.56, and 1.12 ksc which cover the range of possible applied confining pressures in the field applications. The efficiency of fishnet geogrid was find out in term of the interaction coefficient (R_inter). As results, the friction angle between the fishnet and sand is 26.35^o. The R_inter value is about 0.58. Then, the R_inter values were investigated by the finite element method. It was found that if the R_inter values were about 0.55 – 0.65, the measurements were fit with the FEM results significantly. So, the R_inter values of 0.58 can be used to design the sand deposit reinforced by fishnet.