Research Article
Upper-Bound Finite Element Adaptive Analysis of Plane Strain Heading in Soil with a Soft Upper Layer and Hard Lower Layer
Table 2
Critical surcharge loading σs for soft 2.
| Position of soil interface | σs (kPa) | C/D = 1 | C/D = 2 | C/D = 3 | C/D = 4 |
| Case 1 | 222.36 | 639.95 | 1134.43 | 2151.41 | Case 2 | 217.62 | 636.73 | 1084.38 | 2150.03 | Case 3 | 632.54 | 1821.25 | 3551.14 | 6300.08 | Case 4 | 1281.81 | 4242.46 | 7700.54 | 13696.18 | Case 5 | 4806.95 | 16343.04 | 29559.43 | 46918.13 | Case 6 | 4474.04 | 15394.93 | 26954.48 | 51871.79 | Case 7 | 14504.95 | 91493.11 | 212042.83 | 503089.38 |
|
|