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为研究排气状态对非饱和土抗剪强度的影响,以云南昆明的红粘土和粉土为试验土样,以不排气不排水和排气不排水为控制条件进行三轴剪切试验。试验结果表明,排气条件下的非饱和土强度相较不排气时有所提高,且排气状态对红粘土抗剪强度的影响程度大于对粉土的影响程度;粘聚力与饱和度的关系呈非规律性,内摩擦角随饱和度的增大而减小;排气不排水条件下,粘聚力和内摩擦角均随干密度的增大而增大。试验结果证实了排气状态对非饱和土体抗剪强度的显著影响。
In order to study the influence of the exhaust state on the shear strength of unsaturated soils, triaxial shear tests were carried out using red clay and silt in Kunming, Yunnan as the test soil samples, and under the conditions of non-exhaust undrained and undrained exhaust. The experimental results show that the strength of unsaturated soil under exhaust condition is higher than that of non-exhausted one, and the effect of exhaust condition on the shear strength of red clay is greater than that of silt. Cohesion and saturation The internal friction angle decreases with the increase of saturation. Under the condition of exhaustless drainage, the cohesion and internal friction angle increase with the increase of dry density. The test results confirm the significant influence of the exhaust state on the shear strength of unsaturated soils.