Development and Testing of a Tool to Create Multiple Conical Reamed Cable Bolt Anchorages in Weak Rock.

The MCRT and its corresponding anchoring method are easy to use, reliable, and can be used to install cable bolts with a resin-surrounding rock bond strong enough to match the supporting force of the high-strength cable in the cable bolt. The breaking force of conventionally anchored cable bolt with a diameter of 17.8 mm was 355 kN. After the resin had hardened, the cable bolts were pre-tightened so that the changes in cable bolt support forces could be monitored as the working face advanced toward test site. Keywords: Multiple Conical Reaming Tool (MCRT); Weak rock; Cable bolt; Anchoring force; Resin; Anchorage quality improvement EN Multiple Conical Reaming Tool (MCRT) Weak rock Cable bolt Anchoring force Resin Anchorage quality improvement 7887 7897 11 11/15/22 20221201 NES 221201 Introduction Cable bolts have several advantages including their strength, large anchoring ranges, and their capability to transmit high pre-tightening forces. [Extracted from the article]