Abstract: A method of manufacture of geotechnical profiles where thermoplastic material including one or more of polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyethylene or polythene (PE), acrylonitrile butadiene styrene (ABS), or polypropylene (PP), is plasticized in an extruder, pressed through a cross die unit and internal reinforcing profiles in the form of flat bars, arched elements, angled elements, ribbed profiles or sections of any geometry are entered at least in selected cross-section areas of the geotechnical profile where the internal reinforcing profiles are created from one or more of continuous or chopped fiber produced simultaneously or as part of a separate production process.