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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。
Based on the direct shear tests of sand-dominated and remolded soils in Quelo (Muceque, Angola), the effects of structure, moisture content and dry density on the shear strength of Quelo sand were discussed. The experimental results show that the structural influence on the shear strength of Quelo sand is quite complicated, and the shear resistance indexes of undisturbed soil and remolded soil are obviously different. Quelo sand has obvious water softening characteristics, and the cohesion of undisturbed soil and remolded soil And the internal friction angle decreases logarithmically with the increase of water content. The Quelo sand graded well, and the shear strength after compaction is high, which is suitable for backfill materials. The cohesion of remolded soil increases with the increase of dry density Linearly increasing. The internal friction angle is divided into stable section and enlarged section with the increase of dry density, which is characterized by piecewise function.