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通过应力路径三轴试验对不同超固结比下饱和软黏土的K_0系数及K_0超固结软土的抗剪强度进行了研究,提出了超固结软土的K_0系数计算公式,基于各向异性屈服准则推导了K_0超固结软黏土的不排水抗剪强度,并与试验结果对比证明了计算公式的有效性。分析表明,常用的Mayne-Kulhawy K_0系数计算公式过高地估算较大超固结比OCR时的K_0系数,同时所提出的K_0超固结软黏土不排水抗剪强度公式通过考虑土体K_0系数随OCR的变化,避免了假设以有效上覆压力表示的回弹线斜率为常数所存在的问题。通过与试验结果对比表明,该公式能较好地预测K_0超固结土体的不排水抗剪强度。
The K_0 coefficient of saturated soft clay under different overconsolidation ratios and the shear strength of K_0 overconsolidated soft soil were studied by the stress path triaxial test. The K_0 coefficient formula of overconsolidated soft soil was proposed. The heterosexual yield criterion deduces the undrained shear strength of K_0 overconsolidated clayey clay. The comparison with the experimental results proves the validity of the formula. The analysis shows that the commonly used calculation formula of Mayne-Kulhawy K_0 coefficient is too high to estimate the K_0 coefficient of large overconsolidation ratio OCR. At the same time, the formula of undrained shear strength of K_0 overconsolidated soft clay proposed by considering the K_0 coefficient The change in OCR avoids the problem of assuming that the slope of the rebound line, which is expressed in terms of effective overpressure, is a constant. The comparison with the experimental results shows that the formula can predict the undrained shear strength of K0 overconsolidated soil well.