Plaxis is a range of finite element packages intended for 2D and 3D analysis of deformation, stability and groundwater flow in geotechnical engineering.
Geotechnical applications require advanced constitutive models for the simulation of the non-linear and time-dependent behaviour of soils.
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Nicholson Construction Company
A very well-respected specialty geotechnical contractor. They have a number of nice technical articles and case studies published on their website. Visit Nicholson Construction Company

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ChemGrout
ChemGrout offers the world’s widest selection of grouting equipment. Applications include heavy construction, building construction, restoration and repair, highways, bridges, mining, tunneling, geothermal and soil stabilization. Making grouting profitable for over 25 years. Visit ChemGrout

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GEONOR, Inc.
GEONOR: your source for field vane shear and CPT apparatus; geotechnical, structural, vibration monitoring and meteorological instrumentation; high-level application engineering support for our equipment. Visit GEONOR, Inc.