Jet Grouting is widely used in the global geotechnical market and is a well-known technology: notwithstanding, it does remain a state-of-the-art technique, a useful tool at the disposal of Geotechnical Engineers and Site Managers and there is still scope for improvement both in construction practice and design. This thesis focuses on two crucial themes required for quality control: (i) the diameter of the Jet Grouting elements and (ii) the achieved strength of its body. First, the method is explained and the main issues of the Jet Grouting concept are highlighted. A description follows of the diameter control techniques available in the geotechnical industry along with various issues and definitions regarding the strength. Next, case studies, from which various data were gathered, are reported and the thesis is developed with an extended data analysis using graphs and charts. The influence of the ground conditions and soil type on the achieved diameter and strength are also examined. The current document concludes with the mapping of Jet Grouting ‘parameters’, an evaluation of the available diameter control methods and proposals about the way that the Jet Grouting strength can be assessed. A new concept and approach to measure the diameter of a Jet Grouting element on site is developed based on the main factors that influence its size: the executional parameters, the equipment, the grout utilised and the soil conditions.
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