Abstract
This paper descrives some results of analysing the report by Professor L. R. Anderson, which measured forces acting on the steel mats used for strengthening a high retaining wall, in order to investigate mechanism of reinforcing retaining walls by extensible geogrids. As the results of analysis, friction between the mat and the soil was obtained. There is a point which gives zero friction about 2m from the front wall. The part of the mat between the front wall and the above point retains the forward movement of the soil. On the other hand, the part behind the point acts as an anchor. The elongation of the mat is negligible small compared with the horizontal movement of the soil. Further study is needed to deal with the interaction between soil and more extensible geogrids.
