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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。
The monotonic direct shear test, cyclic shear test and monotonous direct shear test after cyclic shear were used to investigate the interfacial shear characteristics of biaxial geogrids with sand under monotonic shear and cyclic shear. The influence of normal pressure on the shear characteristics and dilatancy of the soil-soil interface was studied by the monotonic direct shear test. The cyclic shear test revealed the influence of the normal pressure, the number of cycles and the magnitude of cyclic shear displacement on the cyclic shear and circulation Effect of Shear and Soil Interface Characteristics after Shearing. The test results and parameter analysis show that the peak value of shear stress at the interface between reinforcement and tendons increases with the increase of normal pressure and the number of cycles. The effect of cyclic shear displacement amplitude on the shear stress peaks is insignificant. Shear hardening occurred after cyclic shear, but the peak value of interfacial shear stress after cyclic shear was larger than that of monotonic shear test. The cohesion and internal friction angle of soil-soil interface increased after cyclic shear, and the stability of reinforced structure Sexual enhancement.