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A laboratory study of the soil around injection-expanded wells: physical and mechanical characteristics changes

Ihnatov Siergey V.

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

2022

Vol. 11

137--145

The article is devoted to the description of the physical processes occurring in the soil when cement mortar is injected into the ground under pressure. The paper determines the reason for the lack of knowledge of such kinds of changes in the soil’s physical and mechanical properties around a well expanded by the injection. The article presents the author’s own results in the variability of the physical and mechanical properties of the soil during ground hardening by the injection, in time and in orientation. The differences over time in sand and clay characteristics are also presented.

The sands of medium density and sandy loam density differences investigation while cement injection and pressuremetry crimping

Ihnatov Siergey

Budownictwo i Architektura

2022

Vol. 21, no 4

43--50

The article focuses on the study of medium density sand and sandy loam density changes during water-cement solute injection and pressiometer expansion. Cement mortar injection is performed into boreholes under small pressure of up to 300 KPa resulting in radial well expansion. This expansion process also takes place during pressiometer studies. A cavity of compacted soil is formed around the expended boreholes in radial direction; the anchor and pile load determine field studies of the load, which they can perceive along lateral surface. It is worth noting that they frequently do not coincide with the calculated values. Following field anchor excavations, it was observed that root shearing can occur both directly at the contact between the cement root and the soil and at some distance from it. Subsequent laboratory studies revealed that when the soil is pressed, its density can change along a sinusoid, comprising pressed zones and decompaction zones. This gives rise to the displacement of the shear zone at the contact between the root and the soil.