Dynamic Performance Analysis of Sawdust Mixed Clay Site Model in Shaking Table Test

摘要

A series of shaking table model tests on a sawdust mixed clay site model were conducted at the shaking table testing system with 9 sub-tables in Beijing University of Technology. The tests were performed using a rigid prefabricated continuous model box with dimensions of 7.7 meters long, 3.2 meters wide, and 1.2 meters high. The test system was subjected to strong ground motions from El Centro record and Tianjin record. Through shaking table tests, the dynamic characteristics of the model site were obtained, including the peak ground accelerations and their amplification factors, acceleration time histories, and their Fourier spectra for the site responses. The test results show that: (1) With the increase of intensity of input ground motion, the peak ground acceleration of the site response at the same test point increases, but its acceleration amplification factor decreases. (2) The main frequency components move from high to low frequency. It means that the soil became soften and soil modulus decreased gradually with the increase of intensity of input ground motion.