Abstract
The improvement of soft clay and dredged soils to carry structures is increasingly important. In this study, the dynamic behavior of a crushed stone foundation wall in clay soil was analyzed using a 1g shaking table test. The response accelerations and spectra for three input ground motions were analyzed relative to the distance from the foundation wall, confirming that the acceleration was damped from the outside. The acceleration according to the distance from the wall was not significant under long-period motions, while different responses were obtained under short-period motions. The increased ground stiffness provided by the crushed stone wall lowered the natural period of the ground, and the acceleration amplification under short-period seismic waves was larger than that under long-period waves. Finally, equations were derived to describe the relationship between the acceleration amplification ratio and distance from the wall. The slopes of the proposed equations are larger under shorter periods, implying that the change in acceleration change with distance from the wall is more significant under shorter periods. The results of this study can be used to inform the design of soft soil improvements and the structures built atop them.
Highlights
Global demand for the improvement of soft ground containing layers of clay and dredged soil to enable the construction of structures is gradually increasing
Prieta-type wave and was the smallest for the long-period Hachinohe-type seismic wave, similar to the results observed on the ground surface. These results suggest that distance from the crushed stone does not have a significant influence on ground acceleration under long-period seismic motions
In order to analyze the performance of crushed stone foundation wall-improved soil under various seismic waves, 1 g shaking table experiments were performed
Summary
Global demand for the improvement of soft ground containing layers of clay and dredged soil to enable the construction of structures is gradually increasing. The seismic performance of a stone column installed in a saturated silt layer was analyzed using a scale-model shaking table test [17] in which similitude coefficients were determined according to Buckingham’s π [18] and other physical quantity similarity coefficients deduced by the dimensional analysis method [19] In addition to these existing studies, the use of the stone column method for improving clayey soils has been investigated using model tests and numerical analyses. The results of this study provide an analytical example of a seismic load acting as a horizontal load on a crushed stone foundation wall This type of disaster mitigation research can be used to prevent damage caused by the amplification of ground acceleration in clayey soils, such as that resulting from the Mexico City earthquake of 1985. An improved design and evaluation methodology applicable to clayey soils based on the results of this study can lead to the confident construction of more structures on clayey soils
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