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对昆明地区压实红黏土开展直剪与三轴试验,研究了压实红黏土在不同含水率与压实度状态下的抗剪强度特征。结果表明:压实红黏土的抗剪强度随着含水率的增加而降低,随着压实度的增大而增大;黏聚力跟内摩擦角均随着含水率的增大而减小、随压实度增大而增大;含水率小于最优含水率时,含水率的变化对黏聚力影响较大,当含水率大于最优含水率时对黏聚力影响相对较小;压实红黏土的抗剪强度跟含水率以及压实度成线性关系。两种试验结果得到的抗剪强度参数变化趋势相同,但数值差别较大,直剪试验得到的黏聚力为三轴试验的0.58倍,内摩擦角为三轴试验的1.34倍。
The direct shear and triaxial tests on compacted red clay in Kunming area were carried out to study the shear strength characteristics of compacted red clay under different water content and compaction. The results show that the shear strength of compacted red clay decreases with the increase of water content and increases with the increase of compaction degree. The cohesion and internal friction angle decrease with the increase of water content , Which increases with the degree of compaction; when the water content is less than the optimal water content, the change of water content has a greater influence on the cohesion, while when the water content is greater than the optimal water content, the influence on the cohesion is relatively small; The shear strength of compacted red clay is linear with moisture content and compaction degree. The shear strength parameters obtained by the two test results show the same tendency, but the values are quite different. The cohesion obtained by the direct shear test is 0.58 times that of the triaxial test and the internal friction angle is 1.34 times of the triaxial test.