受じゅ働どう土ど圧あつ係けい数すう

• 主しゅ働どう土ど圧あつ係けい数すう

  Coefficient of active earth pressure; used when the wall moves away from the soil, in contrast to the passive case.

• 静せい止し土ど圧あつ係けい数すう

  Coefficient of earth pressure at rest; applies when there is no lateral movement of the wall.

Compound of 受働 (じゅどう, 'passive') + 土圧 (どあつ, 'earth pressure') + 係数 (けいすう, 'coefficient'). The term is a direct technical translation of the English 'coefficient of passive earth pressure'.