基于颗粒流的黏土-混凝土界面剪切研究

PARTICLE FLOW-BASED STUDY OF CLAY-CONCRETE INTERFACE SHEAR CHARACTERISTICS

为探究土-混凝土界面剪切特性对摩擦桩承载力的影响。使用大型直剪仪对黏土与混凝土进行固结不排水剪切试验,并运用颗粒流软件构建模型。研究结果显示,黏土界面剪切呈现应变软化特征,法向应力从100kPa增至400kPa时,初始剪切模量E呈非线性增大,但其增幅逐渐减小,增幅分别为76%、42.9%和26.8%,残余强度则呈线性递增。同时,数值模拟与试验结果契合度较高。研究结果表明,所建立的黏土-混凝土界面剪切颗粒流模型具有合理性,可为后续摩擦桩承载力相关问题的研究提供重要参考依据。

To investigate the impact of soil-concrete interface shear characteristics on the bearing capacity of friction piles,a large-scale direct shear test was conducted on clay and concrete using a consolidated undrained shear test set-up.Additionally,a particle flow model was constructed using particle flow software.The study found that the clay in-terface shear exhibited strain-softening characteristics.As the normal stress increased from 100 kPa to 400 kPa,the initial shear modulus E:increased nonlinearly,but the rate of increase gradually diminished,with increments of 76%,42.9%,and 26.8%,respectively.In contrast,the residual strength increased linearly.Furthermore,the numeri-cal simulation results closely matched the experimental results.The findings indicate that the established clay-con-crete interface shear particle flow model is reasonable and can provide a valuable reference for future research on friction pile bearing capacity issues.