Would anyone have an idea of how the inclinometer reading will give, say in a soft to firm clay, if the soil undergoes self-consolidation or part of the subsoil weak layer undergoes a consolidation process. Would the inclinometer reading be mistaken for a slip at say certain depth ? I have a soft to firm silty clay slope which shows some slip at a depth of 12m but based on slope stability analysis the slope had a SF larger than 1.2.
Based on slope stability problems in soft Scandinavian clays, I would think that normally, consolidation would not affect inclinometer measurements. However, if the compressible layer is thick, buckling may occur and result in bulging of the inclinometer tube. You can check this by measuring the vertical displacement of the ground surface and compare this with leveling of the top of the inclinometer tube. However, based on your brief description, it may well be that slope movements do occur. The accuracy of stability analyses can be +/- 20%.
I suggest that you plot the relative displacement (lateral displacement in different layers), i.e. to show the tilt of the inclinometer segments rather than the total (accumulated displacement, which is commonly done). You should also inspect the displacement measurements in the two orthogonal directions for clues.