Geotechnical design and analysis Subject:
Slope Stability Analysis
Thank you for your comments. I think I may have not been clear with my original question. I am analysing the temporary and long-term stability of an excavated slope with alternating layers of normally consolidated clays and sands with a relatively high groundwater level.
I am interested to know if it is appropriate to use both effective and total stresses in a single analysis. As an example: (Short term analysis): If a proposed excavation slope is 30 feet high, groundwater is at 10 feet, the upper 10 feet is sand (dry), the middle 10 feet is NC clay (Saturated), and the lower 10 feet is sand (saturated).
Can I use undrained strengths with total stresses in the clay layer, and at the same time use effective stresses for the lower saturated sand layer. The groundwater level used for calculating effective stresses in the lower sand would be at the top of the clay layer.