Table 9 Geotechnical parameters of the tunnel project from Kehua Road to the middle ventilating shaft.
From: A multistage model for rapid identification of geological features in shield tunnelling
Stratum number | Stratum name | Moisture content | Compression modulus | Cohesive forces | Internal friction angle | Poisson's ratio | Standard penetration value | Formation pressure coefficient |
|---|---|---|---|---|---|---|---|---|
% | MPa−1 | kPa | ° | – | Hammer | – | ||
③-1 | Silt clay | 49.3 | 2.24 | 10.4 | 10.6 | 0.35 | – | 0.35 |
③-2 | Muddy silty clay | 41.7 | 2.79 | 13.2 | 12.8 | 0.3 | – | 0.35 |
â‘¢-4 | Clayey silt | 32.5 | 8.59 | 10.6 | 27.5 | 0.3 | 2.6 | 0.3 |
â‘¢-5 | Silty clay | 31.3 | 5.09 | 26.4 | 16.0 | 0.3 | 7.2 | 0.3 |
â‘¢-7 | Clay | 38.6 | 3.60 | 21.4 | 16.9 | 0.35 | 10.0 | 0.3 |
– | Bridge pile-pulled area | – | – | – | – | – | – | – |
