安哥拉Quelo砂抗剪强度特性试验研究

基于安哥拉Quelo（Muceque）砂原状土和重塑土的直剪试验，探讨了结构性、含水率、干密度对Quelo砂抗剪强度的影响。试验结果表明，结构性对Quelo砂的抗剪强度影响较为复杂，原状土与重塑土的抗剪力学指标具有明显差异；Quelo砂遇水软化特性显著，原状土和重塑土的黏聚力和内摩擦角随含水率的增大近似呈对数衰减；Quelo砂级配良好，压实后抗剪强度高，适宜用作回填材料，重塑土的黏聚力随干密度的增大近似呈线性增大，内摩擦角随干密度的增大分为稳定段和增大段，呈分段函数的特征。

Test study of shear strength properties of Angola Quelo sand

Based on direct shear tests on intact and remolded Angola Quelo/Muceque sand,the effects of structural characteristics,water content and dry density on the shear strength have been explored.The test results indicate that the structural characteristics have a relatively complex impact on the shear strength of the Quelo sand;and there are some significant differences in the shear strength parameters between intact and remolded samples.The water-weakening characteristics of the Quelo sand are remarkable;and the cohesion and the internal friction angle of intact and remolded samples tend to be approximately logarithmic attenuation with increasing the water content.The Quelo sand is well-graded and will achieve high shear strength after compaction,which is suitable to be used as backfill material.With increasing the dry density,the cohesion increases linearly and the internal friction angle can be divided into stabilizing section and increasing section,showing the characteristics of sub-functions.