Performance of a Laminar Shear Box for Cohesionless Soil Under Seismic Excitations
摘要
Physical modeling using scaled models is a well-established approach in earthquake geotechnical engineering practice. This study provides a detailed description of the design and construction procedure for a three-dimensional (3D) laminar shear box, suitable for estimating the dynamic response of a soil-structure system. A rectangular laminar shear box, consisting of multiple layered laminas independently supported on rollers attached to an external frame, was used. The outer frame, connected to the rollers, was designed to mitigate the influence of boundary effects in the soil box. A series of shaking events were carried out on an empty container and filled container under dry and saturated conditions. Four scaled-down input ground motions were considered to assess the performance of the soil containers. Various parameters, including natural frequency, acceleration, lateral displacement, backbone curves, and pore pressure response at different depths, were evaluated. The adequacy of the experimental results was further verified using free-field and numerical analysis. Results indicated that the peak ground acceleration at the end of container showed a minimal deviation from the center. The lateral displacement of the container under filled and empty conditions exhibited a minor variation in the range of 3.70% - 10.55%, compared to free-field results. Additionally, the pore pressure response measured at the edge and center of the container showed minimal variation, confirming the suitability of the container for saturated studies. Hence, it is concluded that the developed laminar container is effective under dry as well as saturated conditions.