In collaboration with the Polytechnic University of Turin, we have developed the software SIMS 2.0 to design soil consolidation interventions using Uretek Geoplus® expanding resin.
Our exclusive software is based on a study conducted by the Polytechnic University of Turin on the cavity expansion theory in a finite and infinite medium (Yu H.S. & Houlsby G.T. – 1991, Shrivastava N., Zen K. & Shukla S. K. – 2017). The study was supported by a series of investigations aimed at characterizing the variables determined by the different types of soil that might require our consolidation interventions. The investigations were then validated via dozens of field tests.
The result is SIMS 2.0, a program with a user-friendly interface developed in the Matlab environment and installed on a dedicated server that users can access via their browsers.
SIMS2.0 makes it possible to estimate the improvement in soil characteristics in terms of an increase in static or dynamic tip resistance (CPT, SPT, DP), rather than limit pressure (PMT), allowing consolidation interventions to be sized according to the project requirements.
The theory underlying the SIMS model is based on the following points:
- The resin injected in the soil expands via chemical reaction. The new injection methods patented by Uretek allow the resin to be modelled as a cylindrical cavity, which expands within soil with known physical/chemical characteristics.
- The volume of the expanded cylinder depends of the confinement induced by the soil, as well as the type and amount of resin injected.In fact, it continues to expand until the pressure generated by this process equals the contrasting pressure due to the soil. The intersection of the rheology curve and the cavity expansion curve defines the equilibrium pressure at the resin-soil interface.
- The equilibrium pressure makes it possible to calculate the development of stresses, deformations, and other parameters as a function of distance from the injection axis. The expansion of the resin induces plastic deformations in the volume of soil closest to the injections, while the soil remains elastic beyond this area.
FEATURES OF THE URETEK SOFTWARE SIMS 2.0
Our software is used to design soil consolidation interventions in two ways:
- 1. DESIGN MODE: The user provides input data regarding the resistance to penetration, or the desired pressure limit of the soil due to the consolidation intervention, and the software calculates the amount of resin that should be injected.
- 2. VERIFICATION MODE: The user provides input data relating to the amount of resin to inject and the software calculates the increase in resistance to penetration, or the pressure limit of the soil.
Once the foundation properties, stratigraphy, type of resin, and injection mesh have been entered, SIMS 2.0 shows the results obtained for each layer and generates a series of graphs including:
- swelling pressure curve of the soil and resin; ;
- final tip resistance, tension, deformation;
- density relative to the distance from the centre of injection.
All results can be exported in Excel format ready for printing as a calculation report, or in PDF format.