ABSTRACT
The relationships between compression stress and strain are shown in Fig. 8, Fig. 9 and Fig. 10, which were evaluated from the measuring results of load and displacement in each test. As shown Fig. 8, it can be seen that a maximum load at failure becomes small when the number of the product layer steps of model soil-bags increases. It can be thought the influences of
the restraint of the frictional force between the model soil-bags to upper and lower loading plates decrease due to the increase in the number of the product layer steps as mention above. Therefore, the data spread of the maximum load at failure is small as much as the number of the product layer steps increases. It makes a comparison between the experiment values of bearing load of model soil-bags and estimated values which are calculated based on the ideal three dimensional soilbag model. The bearing loads were estimated by Eq. 5
for the rectangular parallelepiped soil-bag in consideration of the side stresses not acting (σ2f = σ3f = 0). The relationships between the experiment values of the bearing load of the soil-bag and the number of the product layer steps are shown in Fig.11 in the case of L/B = 1. As shown in the figure, the data spread of the experiment values is large and the bearing loads are large too, when there are a few product layer steps of soil-bags. It can be seen that there are influences of the frictional force between the model soil-bags to loading plates. Then, the bearing loads are small and the data spread of the experiment values is small due to the increase in the number of the product layer steps of soil-bags, because the influences of the frictional restraints decreases by the number of the product layer steps. It can be said that it is almost exact, because the test results of reduced friction case are about as well equal to the estimated value by Eq. 5 as shown Fig. 11.
