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利用TSZ-6A型应变控制式三轴仪进行了甘肃陇东(庆阳)某黄土滑坡体土样的室内试验、原状土样的无侧限剪切试验、重塑黄土的加载和卸载试验,分别考虑了不同含水量、不同围压以及初始应力场对于黄土强度的影响,比较了黄土在加载状态和卸载状态下的力学性能,绘制了相应的应力-应变曲线。由试验可知,黄土强度具有极大的结构性,黄土结构的破坏对于其强度影响很大;同时,黄土强度与其含水量、应力状态和应力路径具有重要的联系。
The soil samples of a loess landslide in Gansu Longdong (Qingyang) were tested with TSZ-6A strain controlled triaxial apparatus. The undisturbed shear tests of undisturbed soil samples, the loading and unloading tests of remolded loess, The influence of different water content, confining pressure and initial stress field on loess strength are considered respectively. The mechanical properties of loess under loading and unloading conditions are compared, and corresponding stress-strain curves are drawn. It can be seen from the test that the strength of loess has a great structural effect, and the damage of loess structure has a great influence on its strength. Meanwhile, the loess strength has an important connection with its water content, stress state and stress path.