吉林建筑大学学报

本研究旨在探讨颗粒级配对滑带土抗剪强度的影响，以三峡库区某滑坡作为研究对象，将黏砂混合土样按实际比例配合模拟三峡库区某滑带土，采用分形维数表征连续级配，运用应变控制式三轴仪进行不固结不排水试验，深入研究滑带土的关键力学性质，分析颗粒级配参数(包括粒径分布、细颗粒含量等)对滑带土抗剪强度的影响。研究结果表明：颗粒级配分形维数对滑带土的抗剪强度参数和力学特性具有显著影响，即随着滑带土样本分形维数的增加，其应力差峰值、残余强度、内摩擦角和黏聚力也逐渐增加。

The aim of this study is to investigate the influence of particle size distribution on the shear strength of sliding zone soil.Taking a landslide in the Three Gorges Reservoir area as the research object, this study combined the clay and sand mixed soil sample with a simulated slip zone soil in the Three Gorges Reservoir area according to the actual proportion.The fractal dimension was used to characterize continuous gradation, and the unconsolidated and undrained test was carried out by strain-controlled triaxial meter to further study the key mechanical properties of slip zone soil.The effects of particle grading parameters(including particle size distribution, fine particle content, etc.) on shear strength of slip zone soil were analyzed.The research findings indicate that the fractal dimension of particle gradation exerts a substantial influence on the shear strength parameters and mechanical properties of slip zone soil.With the increase of fractal dimension, the peak stress difference, residual strength, internal friction Angle and cohesion increase gradually.