双向循环荷载下橡胶砾石-土工格栅界面剪切特性

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (2) : 199-209.

土木工程

双向循环荷载下橡胶砾石-土工格栅界面剪切特性

张大伟1，钱振豪2，冯忞1，刘飞禹*2

作者信息 +

Shear characteristics of rubber gravel geogrid interface under bidirectional cyclic loading

ZHANG Dawei1,QIAN Zhenhao2,FENG Min1,LIU Feiyu*2

Author information +

文章历史 +

摘要

橡胶颗粒与土体混合可作为构筑物基础的轻质填料，并能提高其抗震性能。利用室内动态直剪仪进行了一系列循环荷载下的直剪试验，分析了橡胶砾石颗粒级配、法向循环荷载、循环剪切频率对土工格栅-橡胶砾石界面的剪切应力-剪切位移关系和体变特性。试验结果表明：四种颗粒级配界面剪切应力均随着循环次数的增加而增大，表现出剪切硬化的特征，界面竖向位移也随之增大，表现出剪缩的特征；四种级配土中级配良好GR2表现出最高的界面抗剪强度，其界面最终剪缩量最小；当法向和水平加载频率一致时，界面循环峰值剪切应力随着频率的增加而增大，当法向和水平加载频率不一致时，滞回曲线根据法向和水平加载频率的大下呈现周期性变化；在同一颗粒级配下，筋土界面剪切刚度和界面阻尼比均随着法向循环荷载的增加而增大，界面剪切刚度随着循环次数的增加而增大，界面阻尼比则相反。

Abstract

Rubber granules mixed with soil can be utilized as a lightweight filler to enhance seismic performance. A series of direct shear tests were conducted using a custom-built dynamic direct shear apparatus. The analysis focused on examining the shear stress-shear displacement relationship and the volumetric change characteristics of the geogrid-rubber gravel interface with regard to the rubber gravel particle gradation, normal cyclic loading, and cyclic shear frequency. The test results showed that the interfacial shear stress of the four kinds of granular gradation increased with the number of cycles, which shows the characteristics of shear hardening, and the interface experienced vertical displacement also increases, which shows the characteristics of shear shrinkage; among the four kinds of graded soils, the well-graded GR2 demostrated the highest interfacial shear strength and the least final shear shrinkage; when the normal and horizontal loadings are applied, the interfacial shear stress-shear displacement relationship and body transformation characteristics of geogrid-rubber gravel interface are the same, when the normal and horizontal loading frequencies are consistent, the peak interfacial cyclic shear stress escalated with frequency, when the normal and horizontal loading frequencies are inconsistent, the hysteresis curve varied according to the larger of the normal and horizontal loading frequencies; in the same particle gradation, the interfacial shear stiffness and the interfacial damping ratio of the tensile soil increase with the increase of normal cyclic load, the interfacial shear stiffness increases with the increase of the cycle number, and the interfacial damping ratio increases with the increase of the cycle number, and the interfacial stiffness increases with the increase of the cycle number, and the interfacial stiffness increases with the increase of the cycle number. The interfacial shear stiffness increases with the increase of the number of cycles, contrasting with the damping ratio, which demonstrated an opposite trend.

导出引用

张大伟1, 钱振豪2, 冯忞1, 刘飞禹2. 双向循环荷载下橡胶砾石-土工格栅界面剪切特性[J]. 振动与冲击, 2025, 44(2): 199-209

ZHANG Dawei1, QIAN Zhenhao2, FENG Min1, LIU Feiyu2. Shear characteristics of rubber gravel geogrid interface under bidirectional cyclic loading[J]. Journal of Vibration and Shock, 2025, 44(2): 199-209

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