ABSTRACT

The performance of the cablebolts was analyzed numerically while varying lengths and fixing conditions based on the test results obtained from various researches. The supportability of the cablebolts was assessed by comparing displacements, hoop stress taken place in shotcrete and axial bolt forces with those when rockbolts were installed. When cablebolts are grouted without being tensioned, supporting effect was not as good as that of rockbolts resulting in higher shotcrete stress and lower bolt forces. But, their supportability was good enough to substitute rockbolts if tensioned properly. Post grouting right after tensioning of the cablebolts shows reduction in supportability. But long term stability could be achieved without losing supportability if grouted when the bolts are far enough from the face. Further study is necessary including laboratory and in-situ tests under various conditions to use cablebolts as main support in tunnels.

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