Shape acceleration array (SAA) is a sensor based on microelectronic mechanical system (MEMS) testing principle used to test acceleration and displacement

and it has the characteristics of high accuracy

reusable

automatic real-time acquisition. This paper presents the first use of the shape-acceleration array (SAA) technology in shaking table test of pile and composite subgrade in layered soils. We investigate the displacement response of the coupling system of pile and composite subgrade as well as soils under seismic excitations. Experimental results show that SAA can record the dynamic behavior of piles and soils in regard to accelerations and deformations. We also observe that the deformations of piles and soils are compatible only under small amplitude earthquakes. The existence of soft soil layers has a large effect on the horizontal displacement of the soil foundation.