Abstract
Capping using Geosynthetics has been developed recently to keep as much rainwater as possible from infiltrating into the waste layer and thereby reducing the capping layer thickness. To evaluate the restraining effects of rainwater infiltration within the landfill sites’ capping layer using Geosynthetics, sprinkling experiments using two soil apparatuses resembling an actual capping layer were performed in this study. Infiltration and drainage amounts were measured. To elucidate the action of water within the capping layer with the Geosynthetics, a water flow model was designed based on experiment results. The drainage layer shape and construction conditions influencing the rainwater infiltration were simulated using the model. Results showed that drainage and infiltration rates were about 90% and 10%, respectively. Consequently, capping with Geosynthetics can restrain much rainwater from infiltrating into the waste layer. Results obtained using the model also revealed that construction length strongly influences drainage and the infiltration rate.
