Dear colleague,
How to calculate the lateral stress exercise in the walls of the oedometer apparatus during a compression test in the field of non-linear behavior ?
Please let me offer methematical formul, or any experimental technique !
Hi,
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.
Hi,
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.
Hello, Interesting reference should be made to:
Dyvik, R., S. Lacasse and R. Martin (1985): Coefficient of lateral stress from
oedometer cell. 11th International Conference on Soil Mechanics and Foundation
Engineering, San Francisco. 1985. Vol.2, pp. 1003-1006. Also NGI Publ. No. 163.
Dear Prasanth,
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
Best wishes and due regards,
Prof. Arif
Dear Hachimi,
In the elastic condition K0 can be calculated as:
K0=v/(1-v)
v: Poisson's ratio
In these cases the ratio of vertical stress to vertical strain is not equal to the Young’s modulus. ( It is equal to =E(1-v)/((1-2v)(1+v)) )
See the reference (Timoshenko and Goodier, 1951).
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