随着经济持续发展和城市规模不断扩大，推行建筑垃圾的资源化利用和再生利用势在必行，再生混凝土骨料作为建筑垃圾筛分后的破碎物，有着广阔的应用前景。本文以4种不同粒径范围的再生混凝土骨料为研究对象，通过室内大型直剪试验研究了再生混凝土骨料与双向聚丙烯土工格栅的界面剪切特性。试验结果表明，孔径比越小，剪切界面的峰值剪应力以及残余剪应力越大，且峰值剪应力出现的位置越滞后；随着孔径比的减小，峰值似黏聚力和残余似黏聚力逐渐增大，峰值内摩擦角和残余内摩擦角也逐渐增大；加入土工格栅可以有效地减少在界面发生的剪胀现象；引入卡尔哈韦本构方程，通过线性拟合和对数拟合推导出剪切刚度的表达式，得到应力状态 (σn,τ)下对应的剪切刚度。本文揭示了再生混凝土骨料与双向聚丙烯土工格栅界面剪切的剪切机理，剪切刚度的确定在工程实践中对于评估变形机制和稳定性具有重要意义。

With the continuous development of the economy and the expansion of urban areas, it is imperative to promote the resource utilization and recycling of construction waste. As the crushed material obtained from the screening of construction waste, recycled concrete aggregate has broad application prospects. This study focuses on four different particle size ranges of recycled concrete aggregate and investigates the interface shear characteristics between recycled concrete aggregate and bi-axial polypropylene geogrid using large-scale indoor direct shear tests. The results showed that as the aperture ratio decreases, the peak shear stress and residual shear stress at the shear interface increase, and the peak shear stress occurs at a later stage. As the aperture ratio decreases, the peak apparent cohesion and residual apparent cohesion gradually increase, and the peak internal friction angle and residual internal friction angle also increase. The addition of geogrid effectively reduces the occurrence of shear dilation at the interface. By introducing the Kalhaway constitutive equation, the expression for shear stiffness is derived through linear and logarithmic fitting, and the shear stiffness corresponding to the stress state (σn,τ) is obtained. This study reveals the shear mechanism of the interface between recycled concrete aggregate and bi-axial polypropylene geogrid, and the determination of shear stiffness is of great significance in engineering for evaluating deformation mechanisms and stability.

国家自然科学(51768025)：交通循环荷载引起的复杂应力路径下红黏土的动力特性和本构模型研究