STABILITY THRESHOLD FOR CYCLIC LOADING OF SATURATED CLAY
STABILITY THRESHOLD FOR CYCLIC LOADING OF SATURATED CLAY
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DOI：
10.1139/t89-013
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发表时间：
1989-02
影响因子：
3.6
通讯作者：
G. Lefebvre;D. Leboeuf;Benoît Demers
中科院分区：
文献类型：
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作者：
G. Lefebvre;D. Leboeuf;Benoît Demers
本文介绍了哈德逊湾地区一种敏感粘土在循环（重复）荷载作用下的稳定阈值和循环后静强度的试验研究结果。通过慢应变速率和快应变速率或频率、围压高于和低于表观预固结压力下的单调和循环三轴试验，研究了应变速率和结构效应。在与重复加载试验相同的应变速率下，结构粘土和正常固结粘土的稳定阈值均约为原始不排水抗剪强度的60-65%。当重复预压低于阈值时，不排水抗剪强度和破坏包络线基本保持不变。这种预压不会改变粘土结构。关键词：粘土，稳定阈值，循环荷载，地震，循环后强度。
This paper presents the results of an experimental investigation performed to study the stability threshold under cyclic (repeated) loading, and the postcyclic static strength of a sensitive clay from the Hudson Bay region. The strain rate and structure effects were also studied by carrying out monotonic and cyclic triaxial tests at both slow and rapid strain rates or frequencies, and at confining pressures above and below the apparent preconsolidation pressure. The stability threshold for both structured and normally consolidated Grande Baleine clay is about 60–65% of the original undrained shear strength measured at the same strain rate as that used in the repeated loading test. The undrained shear strength and the failure envelope remain essentially unchanged if the repeated preloading is kept below the threshold. The clay structure remains unaltered by this preloading. Key words: clay, stability threshold, cyclic loading, earthquake, postcyclic strength.