it is common to assume a K0 stress state, i.e. the lateral stress is the vertical stress multiplied by K0, where K0 is the earth pressure coefficient at rest. Jaky's formula can be used to estimate K0 for normally consolidated soils:
K0 = 1 - sin(phi), where phi is the friction angle.
See reference for other estimates.
Regards
Reference: R. F. Craig, Craig’s Soil Mechanics, 7th Edition, E & FN Spon, London, New York, 2007.
it is common to assume a K0 stress state, i.e. the lateral stress is the vertical stress multiplied by K0, where K0 is the earth pressure coefficient at rest. Jaky's formula can be used to estimate K0 for normally consolidated soils:
K0 = 1 - sin(phi), where phi is the friction angle.
See reference for other estimates.
Regards
Reference: R. F. Craig, Craig’s Soil Mechanics, 7th Edition, E & FN Spon, London, New York, 2007.
You have two options. Either asssume K0 stress state and proceed or alter your consolidometer with flexible membrane around and compute the lateral deformation creating suction conditions. However, you need to think out of the box for this. May I know the soil type. Refer these articles:
1. "Behavior of compacted expansive soil under multi-directional stress and deformation boundary conditions"
Tamer Y. Elkady · Mohamed F. Abbas · Mosleh A. Shamrani..
2. "Calibrations for volume change measurements using osmotic suction control technique"...
Mohamed F. Abbas · Tamer Y. Elkady · Mosleh A. Al-Shamrani