MONITORING STRESS CHANGES IN 3 DIMENSIONS USING A SOLID CYLINDRICAL CELL

This paper presents a mathematical analysis of an inclusion device to carry out long-term strain-stress variation monitoring. The device con sists of a solid cylinder grouted into a borehole. The equations were derived in three dimensions and based on the hypothesis of the isotrop ic linear elasticity of the different materials. Two cells of distinct ly different design, that is, a steel cell and a concrete cell, were s tudied. While it was noted that the cell strain field is not uniform, this effect can be discounted in most cases. Analysis of the influence of the Young's moduli of the sealing grout and of the surrounding mat erial revealed that a thin layer, of grout should be used to seal the cylinder and that rigid cells should not be considered for monitoring strain-stress variations in three dimensions.