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为了研究含水率和干密度对青海地区非饱和黄土抗剪强度的影响,采用应变控制式三轴仪对不同含水率、不同干密度条件下的重塑黄土进行了常规三轴剪切试验。结果表明:随着干密度的增加,土样的变形曲线由应变硬化到应变软化转变,并且随含水量增加,曲线形式逐渐以应变硬化为主;相同含水率条件下重塑黄土的黏聚力及内摩擦角均随其干密度的增大而逐渐增大;相同干密度下重塑黄土的内摩擦角随含水率的增大而增大,呈线性变化。对以上关系曲线通过回归分析后得到的方程相关性较高,能够较为准确的反映黄土的强度变化规律。
In order to study the influence of water content and dry density on the shear strength of unsaturated loess in Qinghai, conventional triaxial shear tests were conducted on the remolded loess with different moisture contents and dry densities using a strain controlled triaxial apparatus. The results show that with the increase of dry density, the deformation curve of soil samples changes from strain hardening to strain softening, and with the increase of water content, the curve form is gradually dominated by strain hardening. Cohesion of the remolded loess under the same moisture content And the internal friction angle all increased with the increase of dry density. The internal friction angle of the remolded loess at the same dry density increased linearly with the increase of water content. The correlation of the above equation curve obtained through regression analysis is relatively high, which can reflect the intensity variation law of loess more accurately.