Abstract
Construction of embankments on soft ground often causes the differential settlement. Then, deep mixing method of soil stabilization and reinforcement techniques are used to reduce this settlement. This combined method offers the low improvement rate of soil stabilization by using geotextile, because embankment load is transferred to geotextile and pile element. This load transfer results from an arching effect in the reinforced embankment over the pile element heads and a membrane effect of geotextile. And it is considered that a search for the load transfer mechanism in nondestructive and 3 dimensions is important for the performance-based design. However, an interaction between soil and geotextile over the pile element heads is going issue and the real behavior has not been observed precisely. Besides this behavior itself appears in the ground so that it is difficult to check such behavior. In this paper, a series of model test for several soils and geogrids was conducted using a settlement test apparatus. The effectiveness of geogrid for the load transfer mechanisms is confirmed based on all the results using X-ray CT method.
