防灾减灾工程学报2025，Vol.45Issue(2)：458-467,10.DOI:10.13409/j.cnki.jdpme.20230826001
法向循环荷载下土石混合料-格栅界面剪切特性研究
Study on Shear Characteristics of Soil-rock Mixture-geogrid Interface under Normal Cyclic Loading
摘要
Abstract
As a widely used subgrade filler,soil-rock mixtures form reinforced structures with geogrids that serve as critical components for bearing and transferring traffic loads.Their strength and stability are affected by the dynamic shear characteristics at the soil-reinforcement interface under nor-mal cyclic loading.A series of dynamic direct shear tests were conducted on soil-rock mixture-geogrid interface using a large-scale dynamic shear apparatus.The effects of normal loading frequency(0.05,0.1,1 Hz)and normal stress amplitude(20,40,60 kPa)on the interface shear characteristics of soil-rock mixture-geogrid interface at different fines content(0%,20%,40%,60%,80%,100%)were analyzed.The results showed that under normal cyclic loading,both the shear stress and normal dis-placement exhibited periodic variations.The interface shear strength initially increased and then de-creased with increasing fines content,reaching its maximum value at a 40%fines content.Further-more,the interface shear strength increased with the amplitude but decreased with the frequency.In-creasing fines content reduced interface shear shrinkage,whereas increasing the amplitude and fre-quency enhanced it.The interface friction coefficient and normal stress demonstrated the same periodic variation,with a phase difference of approximately 0.5 cycles.Notably,the interface friction coeffi-cient,both at peak and residual stages,showed a trend of first increasing and then decreasing as the fines content rose.关键词
筋土界面/细粒含量/振动幅值/加载频率/土石混合料Key words
soil-reinforcement interface/fines content/vibration amplitude/loading frequency/soil-rock mixture分类
建筑与水利引用本文复制引用
刘飞禹,王迪,付冬平..法向循环荷载下土石混合料-格栅界面剪切特性研究[J].防灾减灾工程学报,2025,45(2):458-467,10.基金项目
国家自然科学基金项目(52378355,52078285)资助 （52378355,52078285）
