Borehole strain meter arrangement using conventional vertical or mechanical strain motors - measures convergence movements between roof and floor of underground chamber and swelling movements in the suspended and supported layers

摘要

A borehole strain meter arrangement uses conventional vertical or mechanical Harwardt strain meters with inductive, capacitive or other measurement transducers. For vertical installation in underground measurement chambers both convergence movements between reference points (1,6) in the roof and floor and swelling movements of the suspended and supported layers are measured. This technique enables an approximate separation to be achieved between the local motion components from the geomechanically interesting strain variations of regional relevance. USE/ADVANTAGE - For use in area monitoring of underground deposits of radioactive and chemical waste, mines etc.. The arrangement eliminates some disadvantages of conventional arrangements and can be applied at economical cost.