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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 fak300 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

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