作　　者： (赖丰文）; (李丽萍）; (陈福全）;

机构地区： 福州大学土木工程学院,福州350116

出　　处： 《中国科技论文》 2017年第13期1559-1564,共6页

摘　　要： 利用单调直剪试验、循环剪切试验、循环剪切后单调直剪试验,探究单调剪切与循环剪切作用下双向土工格栅与砂土界面剪切特性。通过单调直剪试验研究了法向压力对筋土界面剪切特性以及剪胀性的影响;循环剪切试验则揭示了法向压力、循环次数以及循环剪切位移幅值对循环剪切及循环剪切后筋土界面特性的影响。试验结果与参数分析表明,筋土界面剪应力峰值随着法向压力和循环次数的增大而增大;循环剪切位移幅值对界面剪应力峰值的影响甚微;界面经单调直剪与循环剪切后均发生了剪切硬化,但循环剪切后的界面剪应力峰值大于单调剪切试验;循环剪切后筋土界面黏聚力及内摩擦角均有所提高,加筋结构稳定性增强。 Mono tonic-direct shear and cyclic shear behavior of the interface between geogrid-sand were investigated by conducting mono tonic shear tests？ cyclic shear tests and post-cyclic direct shear tests. The effects of normal pressure on the interface shear behavior and dilatancy were analyzed in monotonic direct shear tests. Moreover, the influence of normal pressures, cyclic num-bers and cyclic shear displacement amplitude on shear characteristics and dilatancy of the interface were also investigated by cyclic shear tests. The results showed that the peak value of interface shear strength increases with the increase of the normal pressure and cycle numbers？ but the effect of cyclic shear displacement amplitude on the interface shear stress is weak. Monotonic and post-cyclic direct shear would lead to shear-hardening of the interface, but the peak value of interface shear strength in the mono-tonic shear test was higher than the post-cyclic direct shear test. The interface shearing strength parameters and the stability of reinforced structures were improved after cyclic shearing.

关 键 词： 土工格栅 砂土 界面特性 单调直剪试验 循环剪切试验