PROGRESSIVE FAILURE OF HEAVILY OVERCONSOLIDATED CLAYS
PROGRESSIVE FAILURE OF HEAVILY OVERCONSOLIDATED CLAYS
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严重超固结粘土的逐渐破坏
DOI：
10.3208/sandf.39.2_105
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发表时间：
1999
影响因子：
3.7
通讯作者：
Dan T. Constantinescu
中科院分区：
文献类型：
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作者：
A. Asaoka;M. Nakano;T. Noda;Toshihiro Takaine;K. Kaneda;Dan T. Constantinescu
摘要为了了解超固结粘土的渐进破坏过程，对超固结川崎粘土进行了恒载三轴压缩试验。这些测试表明，经过一段时间后，轴向应变率波动与显着的峰值，直到试样达到彻底失败。实验过程中，然后使用土-水耦合有限元技术进行数值模拟。轴对称条件下的三轴压缩试验的数值模拟没有表现出与三轴试验相同的行为（剪切带形成和轴向应变率与轴向应变图中的轴向应变率波动），而在平面应变条件下，它正确地描述了实验中观察到的轴向应变率波动。轴向应变率的这种波动与试样内局部剪切区的进展密切相关。这种现象是由于饱和粘土的“非局部”特性。由于达西定律限制了土壤中总渗透水头的梯度，局部剪切带的孔隙水供应并不总是充足的，因此试样表现出不同的应变率。第三系泥岩卵石可理想化为严重超固结粘土。严重超固结粘土的渐进破坏表明，破碎的第三纪泥岩的行为是由于卵石之间的接触点的熟化。
ABSTRACT In this study, in order to comprehend the progressive failure of an overconsolidated clay, triaxial compression tests under constant load application for the overconsolidated Kawasaki clay are carried out. These tests show, after a certain period of time, axial strain rate fluctuations with marked peaks until the specimen reaches outright failure. The experimental procedure is then numerically simulated using the soil-water coupled finite element technique. While the numerical simulation for the triaxial compression test under axi-symmetric conditions did not exhibit the same behavior as in the triaxial test (shear band formation and fluctuation of axial strain rate in the axial strain rate vs. axial strain plot), under plane-strain conditions it properly described the fluctuation of axial strain rate as observed in the experiments. Such fluctuations in the axial strain rate are closely related to the progression of the localized shear zones within the specimen. This behavior is attributed to the “non-local” characteristics of saturated clays. Since the pore water supply to the localized shear zone can not always be sufficient due to Darcy’s law which limits the gradient of global seepage head in the soil, the specimen exhibits varying strain rates. Tertiary mudstone pebbles can be idealized as heavily overconsolidated clay. The progressive failure of a heavily overconsolidated clay suggests that the behavior of crushed Tertiary mudstone is due to slaking at the contact points between the pebbles.
“接近/处于临界状态的严重超固结粘土的土水耦合行为”土壤和地基。
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