Evaluating the Effect of Different Stress Path Regimes on Borehole Deformation Using Convergence Measuring Device

A laboratory study was conducted to investigate the borehole deformation of poorly cemented sandstone rocks with Uniaxial Compressive Strength (UCS) less than 10 MPa under different stress path regimes by using a convergence measuring device (CMD). Synthetic thick-walled hollow cylinders (TWHCs) comprised sand grains, Portland cement and water were prepared for this study. series mechanical tests including uniaxial triaxial compression performed examine physical properties artificial sandstones. vertical displacement loading rate 0.07 mm/min confining pressure at 0.2 MPa/min applied experiments. The CMD deployed inside TWHC specimen measure deformation. Five paths specimens effect paths, three agent contents (10%, 12% 14%) considered content on failure. failure found be more significant change in regimes.