Research on sustainable slope stability system by combined earth reinforcement technology against mainly infiltration of rainfall

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In this study, experimental and numerical pullout are carried out in order to investigate the influence of infiltration on the interaction between soil-geogrid paying attention to the compaction effect and confining effect, together with a series of erosion protecting tests of soil chemical improved ground due to rainfall. The compaction could enhance the pullout strength of embedded geogrid efficiently, and the chemical improved ground with proper compaction could give a proper resistance against erosion. However, the compaction could not mitigate the influence of infiltration on the pullout strength. In addition, the falling weight deformation apparatus (FWD) which has been developed at geotechnical engineering laboratory of Kyushu University was improved to evaluate the degree of slope soundness. The apparatus has a light weight and has also an advantage as a non destructive way for slopes. It is instrumented with a drop-weight machine to measure the deformation modulus. The effectiveness of the improved FWD was verified by measuring the surface deformation modulus of model and actual slope due to rainfall , paying attention to the degree of compaction.