What Does Radial Displacement Mean?
Radial displacement is a component of change in the radial direction or displacement along the radius of the borehole. Sub-surface soil and rock formations are constantly under stress due to overburden pressure and tectonic stresses. During installation of pipelines using trenchless construction methods such as horizontal directional drilling (HDD) and microtunneling, boreholes are drilled under the earth's surface.
Inadequate drilling fluid or overcoring of borehole can cause stresses to develop in the borehole leading to instability or collapse.