Table 17 Recommended support according to SMR score (Romana 1993)
SMR Score | Support |
|---|---|
91–100 | None |
81–90 | None; scaling |
71–80 | None; toe ditch or fence; spot bolting |
61–70 | Toe ditch or fence; nets; spot or systematic bolting |
51–60 | Toe ditch and/or nets; spot or systematic bolting; spot shotcrete |
41–50 | Toe ditch and/or nets; systematic bolting; anchors; systematic shotcrete; toe wall and/or dental concrete |
31–40 | Anchors; systematic shotcrete; toe wall and/or concrete; re-excavation; drainage |
21–30 | Systematic reinforced shotcrete; toe wall and/or concrete; re-excavation; deep drainage |
11–20 | Gravity or anchored wall; re-excavation |