Adjusting Coefficient for Seismic Bearing Capacity ξa
Values of adjusting coefficient for seismic bearing capacity ξa (Tbl. 4.2.3 from GB 50011-2010):
Name and property of the subsoil | ξa |
Rock, dense gravelly soil, dense gravel and coarse and medium-coarse sand, clay and silt whose fak ≥ 300 kPa | 1.5 |
Medium and moderate dense gravelly soil, medium dense and moderate dense gravel and coarse and medium-coarse sand, dense and medium dense fine and silty sand, clay, silt and firm loess whose 300 kPa ≤ fak < 300 kPa | 1.3 |
Moderate dense fine and silty sand, clay, silt and plastic loess whose 100 kPa ≤ fak < 150 kPa | 1.1 |
Mud, muddy soil, loose sand, miscellaneous fill, newly accumulated loess, and soft loess | 1.0 |
Note: In JTJ 004-89, it‛s table 2.2.1 which is similar to the above table.
Values of adjusting coefficient for seismic bearing capacity ξa (Tbl. 5.5.1 from JTS 146-2012):
Subsoil | ξa |
Loose sand, not in liquidation status | 1.0 |
Normal sand soil, not in liquidation status | 1.3 |
Dense gravelly soil and bedrock | 1.5 |