原文指出飽和土的孔隙压力系数A_d等于剪胀系数S_d.笔者认为,虽然利用簡化的“λ”理論可以証明A_d=S_d,但事实上却并不如此,要說明这一点,首先应从理論上进行分析. 現仍采用前人的分析方法,假定土骨架的三个主应力方向的弹性模量E_1,E_2和E_3是不同的,而泊桑比v是一致的,以此来表征土的剪胀性。于是,某一土块在有效主应力增量△σ_1′,△σ_2′和△σ_3′下的 The original text indicates that the pore pressure coefficient A_d of saturated soil is equal to the dilatancy coefficient S_d. The author believes that although the simplified “λ” theory can be used to prove A_d=S_d, it is actually not the case. To illustrate this point, the first step should be theoretically performed. Analysis. The analysis methods of predecessors are still used. It is assumed that the elastic moduli E_1, E_2 and E_3 of the three principal stress directions of the soil skeleton are different, while the Poisson’s ratio v is the same, so as to characterize the dilatancy of the soil. Sex. Thus, a certain soil block under the effective principal stress increments Δσ_1′, Δσ_2′ and Δσ_3′