Abstract
The state-of-the-art methods for verifying the correctness of ground improvement performed using the DSM (Deep Soil Mixing) technology are largely focused on the selection of adequate factors impacting the achievement of a correct compressive strength fc [MPa] of the column core, which ensures the transfer of stress from the designed structures to the subsoil. In view of the operation of each of the columns, it is equally significant to ensure that their bases are located in load-bearing soil at the entire area of the improvement, without the need to perform many costly subsoil surveys. Based on the complementary soil investigation results and parameters obtained during deep soil mixing from an automatic logger installed on the drilling machine, a method of comparing the rotary drive pressure (working pressure) PKDK [bar] and the cone resistance qc [MPa] of the CPTU static probe (Cone Penetration Test Unit with Pore Pressure Measurement) was developed along with the method to interpret the results in the context of the correctness of the ground improvement on the construction site analyzed in this paper.
Highlights
In situ Soil Mixing (SM) is a versatile ground improvement method
The binders are injected into the soil in dry (Dry Deep Soil Mixing) or slurry (Wet Deep Soil Mixing) form through hollow mixing shafts tipped with various cutting tools and equipped with auger flights, mixing blades or paddles to increase the efficiency of the mixing process
The logs of the automatic logger for representative columns as well as the complementary soil survey constituted the basis for the verification of the assumed improvement method and especially of the length of the Deep Soil Mixing (DSM) columns
Summary
In situ Soil Mixing (SM) is a versatile ground improvement method. It can be used to stabilize a wide range of soils, including soft clays, silts, and fine-grained sands. The engineering properties of the stabilized soil will depend on the characteristics of the binder. They will depend, to a large extent, on the inherent characteristics of each soil and the way it has been deposited, as well as on mixing and curing conditions at a particular worksite. The binders are injected into the soil in dry (Dry Deep Soil Mixing) or slurry (Wet Deep Soil Mixing) form through hollow mixing shafts tipped with various cutting tools and equipped with auger flights, mixing blades or paddles to increase the efficiency of the mixing process. The shafts, mounted in single or multiple arrangements, rotate about the vertical axis and produce individual or overlapping soil-mix columns [1–4]
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