Dynamic characteristics of reinforced gravelly soil under semi-sinusoidal cyclic traffic dynamic load
WANG Jiaquan1,2, HOU Senlei1,2, LIN Zhinan1,2, HUANG Shibin1,2
1. College of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China;
2. Guangxi Zhuang Autonomous Region Engineering Research Center of Geotechnical Disaster and Ecological Control, Liuzhou 545006, China
Abstract：In order to study the dynamic characteristics of reinforced gravel soil under traffic load with different reinforcement form, which included non-reinforcing, horizontal reinforcing, circular vertical reinforcing and circular 3-dimensional (3D) combination reinforcing with geogrid as the reinforcement material, a series of dynamic triaxial tests under multi-stage and long-term half sinusoidal cyclic load were carried out. And the formula of soil damping ratio under half sinusoidal cyclic load is deduced. Furthermore, the effects of the number of reinforced layers and confining pressure on the dynamic characteristics of circular 3D combination reinforced gravel soil were studied, such as the damping ratio and shaft curve. The test results show that under multi-stage cyclic loading, the damping ratio of gravelly soil samples increases in the early stage and then decreases. The damping ratio reaches its peak when the dynamic strain reaches about 1%, and the reinforcement can reduce the damping ratio of the samples. Hardin-Drnevich model was found it is applicable to describe the backbone curve of reinforced gravel soils. The parameters A and B have a linear and exponential relationships between confining pressure and reinforcement layers, respectively. Finally, the backbone curve equation of the circular 3D combination reinforced gravel soil under different confining pressures and reinforced layers is presented, which based on Hardin-Drnevich model.
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