6.16 Dynamic behavior of gravity type wall
An experiment of a dynamic earth pressure acting on the caisson foundation
A shaking test of the caisson foundation under a 40 G centrifugal acceleration was performed by using PHRI geotechnical centrifuge (Kazama et al. 1994). The cross section of the caisson to ground system and the sensor layout is shown in Photo 1. The model dimension is given in Table 1. The caisson was provided with a pressure receive plate to measure the earth pressure using three bi-axial load cells. The model is shown in Photo 2. The model ground was made by dry sand. The acceleration wave recorded at Hachinohe Port during the Tokachi-oki earthquake (1968) was used in the tests. The model mounted on the platform of PHRI centrifuge and high speed camera are presented in Photo 3 & 4.
The typical results of the test are shown in Fig. 2. Fig. 2(a) shows the resultant force of the total earth pressure on the caisson. Fig. 2(b) shows the friction force between the caisson and the base ground. Fig. 2(c) shows the inertia force of the caisson. These results are useful to estimate the behavior of the caisson during earthquake.
References
Kazama, M., Inatomi, T., Iizuka, E. (1994) : Comparison of 1 g and centrifuge models of a dynamic earth pressure problem, Proc. of CENTRIFUGE 94, pp. 197-202.
For further information, mail to A/Prof. Kazama or visit his Web site.
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