Oedometer to study of peat stabilization techniques

Abstract


This paper presents a new oedometer to study of peat compressibility and techniques of its stabilization under embankment. The dimensions of oedometer’s ring are more than in traditional one: diameter 14.8 cm, height 7.0 cm. The pore water is escaped from a sample only through a perforated loading plate. During testing, for example at the secondary consolidation stage, a plate is fixed by special screws and the oedometer is removed from loading frame and turned over. The plugs are unscrewed from the holes located in the device bottom and a stabilization substance is embedded into peat sample through all or part of the holes located symmetrically relative to each other. After that the oedometer is returned to loading frame and deformation measurement is continued. Due to the elimination of even temporary peat unloading and expansion the oedometer is allowed to make more accurate and reliable prediction of deformations after embedding a stabilizer into peat layer under embankment.The studied peat had the following properties: density 0.98–1.02 g/cm3, water content 770–920%, void ratio 11.8–14.2, decomposition degree 40–45%. Bentonite which sorbs water from micropores of peat in terms of swelling process was used as the stabilizer substance. The initial water content of bentonite was equal 6 %, free swell was reached 95 %, water content after swelling 138 %. The test results showed that embedding of bentonite in an amount of 10 % of the sample volume makes it possible to stabilize deformation of peat. The addition of cement to bentonite prevents the development of settlement with a significant increase in the load from the embankment after stabilization.

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About the authors

G. Yu Ivakhnova

Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU), Arkhangelsk, Russian Federation

A. S Tutygin

Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU), Arkhangelsk, Russian Federation

A. L Nevzorov

Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU), Arkhangelsk, Russian Federation

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