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Journal of Engineering
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2023
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Article
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Tab 1
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Research Article
A Rock Mass Classification Method for Tuff Tunnel Based on the High-Pressure Gas Expansion Method
Table 1
Rock mass integrity index
and rock volume nodule number
.
(strip/
)
<3
>0.75
3∼10
0.75∼0.55
10∼20
0.55∼0.35
20∼35
0.35∼0.15
≥35
≤0.15