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About Module 4: Rock Mass Classification: 4.6 Tunnelling Quality Index (Q)
The document discusses the Tunnelling Quality Index (Q) system of rock mass classification proposed by Barton, Lien and Lunde. The Q value is calculated using five parameters: RQD, joint set number, joint roughness, joint water reduction, and stress reduction factor. Each parameter is assigned an index value based on descriptions in provided tables. The Q system provides a quantitative measure of tunneling conditions, ranging from 0.01 to 100, with higher values indicating better rock mass for tunnel excavation. The parameters consider effects of discontinuities, water pressure, and stress conditions on tunnel stability.
Detailed Information
| Author: | ['tanujaayer'] |
|---|---|
| Publication Year: | 2017 |
| Pages: | 7 |
| Language: | English |
| Format: | |
| Price: | FREE |
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