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

本研究以土工格栅为研究对象，在考虑压实效应和围护效应的基础上，进行了入渗对土工格栅-土工格栅相互作用影响的试验和数值拔出试验，并对降雨作用下的土壤化学改良地基进行了一系列防蚀试验。压实能有效地提高埋入土工格栅的抗拔强度，适当压实的化学改良地基具有较好的抗冲刷能力。但压实不能缓解渗透对土体抗拔强度的影响。此外，对九州大学岩土工程实验室研制的落锤式变形仪(FWD)进行了改进，以评价边坡的安定性。该仪器重量轻，作为一种非破坏性的斜坡检测方法也具有优势。用落锤机测量变形模数。通过测量模型和实际边坡在降雨作用下的地表变形模数，并考虑压实度，验证了改进后的FWD方法的有效性。

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.