GROUTED ROCK SUPPORT TESTING APPARATUS AND METHOD

摘要

The invention relates to apparatus and a method for testing the grout quality around a rock anchor (100) grouted into a drill hole (102). First and second conductors are grouted into the hole with exposed conductive portions supported in known spaced apart. The second conductor is preferably provided by an elongate body (108) of a rock anchor and the first conductor by an insulated wire (12) with an exposed portion at an inner end. An electrical current through the conductors and the resistivity of the grout between the conductors is calculated using a suitably calibrated measuring device (34). The resistivity readings provide an indication of the grout integrity of the anchor installation.