饱和度变化对非饱和粉质粘土抗剪强度的影响

Effects of Saturation on Shear Strength of Unsaturated Silty Clay

边坡工程中的土体多为非饱和土,其抗剪强度的研究对于分析边坡稳定性十分关键.但在实际工程中,由于非饱和土的饱和度多没有规律,且孔隙比与含水量又各不相同,因此为了找出非饱和土抗剪强度指标受饱和度影响的变化规律,本研究采用制备重塑土样的试验方法进行三轴和直剪试验,旨在找出相同孔隙比和不同饱和度条件下重塑土样在不同制样方法和不同剪切试验下的抗剪强度指标的变化规律.试验表明:非饱和土在不同的制样方法和实验条件下,其抗剪强度指标的变化规律差别较大,因此在工程实际运用过程中,在分析边坡稳定性时应查明边坡非饱和土体的形成原因,要对应分析其饱和度对土体抗剪强度的影响,这对工程实际中的边坡稳定性分析具有重要的指导意义.

Most soil of slope engineering is unsaturated. Shear strength of unsaturated soil research is critical for slope stability analysis. The saturation of unsaturated soil are more irregular in actual engineering, and the poros- ity and water content are different. In order to find out the unsaturated soil shear strength index affected by satu- ration change rule, the remodeling samples were prepared for triaxial test and direct shear test, and which can find out the change law of shear strength indexes under the same void ratio and the different saturation remodeling samples with different sample preparation method and the different shear test method. The results suggested that the shear strength indexes of the unsaturated soil variation difference were bigger than that with different prepara- tion and test method. During the process of engineering practice, urated soil slope is important for slope stability analysis, and the tion on shear strength of soil. finding out the causes of the formation of unsat- correspondence analysis of the effects of satura-