Dynamic Behavior of Ground Improved Using a Crushed Stone Foundation Wall

Su-Won Son, Pouyan Bagheri and Jin-Man Kim
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Su-Won Son: Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Korea
Pouyan Bagheri: Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Korea
Jin-Man Kim: Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Korea

Sustainability, 2019, vol. 11, issue 10, 1-13

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.

Keywords: ground improvement; crushed stone; foundation wall; 1 g shaking table test; acceleration amplification ratio; response spectrum; ground acceleration (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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