半正弦循环交通动载下加筋砾性土动力特性研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (3) : 90-98.

论文

王家全1,2，侯森磊1,2，林志南1,2，黄世斌1,2

作者信息 +

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

Author information +

文章历史 +

摘要

为研究交通荷载下加筋砾性土的动力特性，以土工格栅为加筋材料，开展了多级长期循环荷载下无筋、平铺、环形竖向及环形立体组合加筋等不同加筋形式的半正弦循环荷载下加筋饱和砾性土动三轴试验，同时也进行了半正弦循环荷载下土体阻尼比计算公式的推导，并研究了加筋层数和围压对环形立体组合加筋砾性土阻尼比、骨干曲线等动力特性的影响规律。试验结果表明：多级循环荷载下砾性土试样的阻尼比呈现前期增大随后减小的规律，阻尼比在动应变达到1%左右达到峰值，且加筋能够减小砾性土试样的阻尼比；Hardin-Drnevich模型适用于描述加筋砾性土的骨干曲线，且模型参数a、b与围压和加筋层数之间分别存在线性关系和指数关系，基于此提出适用于不同围压、不同加筋层数下环形立体组合加筋砾性土的骨干曲线方程。

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.

导出引用

王家全1,2，侯森磊1,2，林志南1,2，黄世斌1,2. 半正弦循环交通动载下加筋砾性土动力特性研究[J]. 振动与冲击, 2022, 41(3): 90-98

WANG Jiaquan1,2, HOU Senlei1,2, LIN Zhinan1,2, HUANG Shibin1,2. Dynamic characteristics of reinforced gravelly soil under semi-sinusoidal cyclic traffic dynamic load[J]. Journal of Vibration and Shock, 2022, 41(3): 90-98

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