Investigation of the de formability of gypsofied soils by a static load

Conclusions

• 1. In a natural state and in the case of brief flooding gypsofied soils are not very compressible and are a sufficiently reliable soil base.

• 2. In the case of long-term flooding, pi** settlement develops in gypsofied soils, the magnitude and character of development of which depend on the nomenclatural type of soil, initial gypsum content, relative amount of leached salts, soil properties, and acting load. The value ofδ _p varies from 0.12 to 0.106. Pi** settlement does not play a practical role in loamy sands containing up to 10% gypsum.

• 3. In the gypsofied crumbly loams and soils of the gypsum horizon mechanical removal of particles occurs along with chemical pi**, which leads to loss of the bearing capacity of the base.

• 4. In the investigated soils pi** settlement amounts to 76.2–93.5% of total settlement of the soil.

• 5. During leaching of the gypsum from the soils there occurs an increase of the depth of the deformed zone and of layerwise compression of the plates under a constant load in the given experiment. The depth of the deformed zone by the end of the experiments amounted to 1–1.5 of the side of the plate.