Injection of A Collapsed Rock Mass and the Installation of 100 Ton Strand Anchors at the PHEP II Project-Video

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Video Summary

A 2016 collapse of weathered rock filled part of a hydroelectric cavern in Bhutan, creating a large void above the chamber. Bauer began remediation in 2019, drilling through the chaotic mass and using staged gravity and high-pressure grouting to consolidate it. Crews injected 5,460 cubic meters of grout, then installed 369 cable anchors to tie the cavern walls to the treated rock. Core tests showed an average compressive strength of 28.3 MPa, meeting the client’s requirements. The work stabilized the collapsed mass and enabled the cavern to function as a compensation chamber.

Keywords

Bhutan hydroelectric cavern collapse

grouting remediation

cable anchors

compensation chamber

rock stabilization