Abstract
The results of laboratory studies of compaction of weak water-saturated soils using surface vacuuming are presented. Experiments on the compaction of water-saturated peat by the method of surface vacuuming under the screens were carried out on a special installation. The vacuum was created under round sealed screens of different sizes and stiffness. As the results of the experiments showed, the mechanism of compaction of weak water-saturated soils during vacuuming from the surface under the protection of a sealed coating is determined by the action of volumetric filtration forces. When vacuuming, in contrast to the compaction load, there is no soil venting around the perimeter of the compacted surface area, which significantly increases the efficiency of this method. And the use of flexible screens (geo-membrane) opens up opportunities for construction. A series of compression tests was carried out to identify the similarities and differences in the consolidation processes when compacting different materials by vacuuming and equivalent load created by the press.
Highlights
The technology of surface vacuuming during compaction of weak water-saturated soils before the construction of facilities on them has been actively studied recently [1,2,3] and requires strict experimental justification for its successful application
Comparative tests of identical samples of water-saturated peat of the disturbed structure according to the schemes "A" and "B1" gave the same results the constant height of the specimen the value of the pore pressure in the vacuum were established through 9-10 hours
The rate of pore pressure stabilization in height depends on the filtration coefficient of the material
Summary
The technology of surface vacuuming during compaction of weak water-saturated soils before the construction of facilities on them has been actively studied recently [1,2,3] and requires strict experimental justification for its successful application. This method is applicable in cases where a structure has to be built on top of weak soils. Experiments on the compaction of water-saturated peat by the method of surface vacuuming under the screen of limited size were carried out at a facility that included a tank of cylindrical plexiglas connected to a vessel for feeding the soil with water, a measuring tank for collecting pumped water and a vacuum installation. The sediment screen was measured by spicemaster mounted on cross-piece rigidly connected to the stand tank
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