土的静止侧压力系数是指在没有侧向变形的条件下,作用在土上的水平有效应力σ′_3与垂直有效应力σ′_1之比,一般以K_0表示,即: K_0=σ′_3/σ′_1…… (1) 最初强调静止测压力重要性的是太沙基(1920年)。他是把侧向无变位状态的水平全应力σ_3与垂直全应力σ_1之比,定义为静止侧压力系数K_0, The static pressure coefficient of the soil refers to the ratio of the horizontal effective stress σ′_3 and the vertical effective stress σ′_1 acting on the soil under the condition of no lateral deformation, and is generally expressed as K_0, ie: K_0=σ′_3 /σ’_1... (1) It was Tai Saki (1920) who first emphasized the importance of measuring pressure at rest. He defined the ratio of the horizontal total stress σ_3 and the vertical total stress σ_1 in the laterally unaltered state to the static side pressure coefficient K_0.