Research Article
Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM
Table 1
Surrounding rock information of Lanzhou water conveyance tunnel construction project.
| | Formation | Lithology | Color | Hardness | Weathering resistance | Integrity | Figure |
| | Middle Caledonian (δο32) | Quartz diorite | Gray-black | Hard | Strong | Good | | | Pre-Sinian Maxianshan Group (AnZmx4) | Quartz schist | Gray-black and greyish-green | Hard | Strong | Good | | | Mid-Caledonian (γ32) | Granite | Off-white | Hard | Strong | Good | | | Lower Cretaceous Hekou Group (K1hk1) | Mudstone and siltstone interbedded | Brown red | Soft | Weak | Poor | | | Ordovician Upper Middle Wusu Mountain Group (O2-3wx2) | Metamorphic andesite | Gray-green | Hard | Weak | Poor | |
|
|
