Rate effects and cyclic loading of sensitive clays
Rate effects and cyclic loading of sensitive clays
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DOI：
10.1061/(asce)0733-9410(1987)113:5(476
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发表时间：
1987-05
期刊：
影响因子：
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通讯作者：
G. Lefebvre;D. Leboeuf
中科院分区：
文献类型：
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作者：
G. Lefebvre;D. Leboeuf
本文介绍了一系列单调和循环三轴试验的结果，以研究应变速率和荷载循环对加拿大东部三种未受扰动的敏感粘土的不排水抗剪强度的影响。对于结构性粘土（自然超固结），在给定偏差处产生的孔隙压力基本上与应变速率无关，而峰值强度包络线随着应变速率的降低而降低。对于破坏粘土（通常固结），较低的应变速率导致剪切过程中产生的孔隙压力增加，这是由于粘土骨架倾向于蠕变，而峰值强度包络线保持不变。然而，从定量的角度来看，应变率增加引起的抗剪强度增加对结构性和正常固结粘土都是相似的，并且至少在应变率的5个对数周期内是线性的。
The paper presents the results of a series of monotonic and cyclic triaxial tests carried out to study the influence of the rate of strain and load cycles on the undrained shear strength of three undisturbed sensitive clays from eastern Canada. For structured clays (naturally overconsolidated), pore pressures generated at a given deviator are essentially independent of the strain rate, while the peak strength envelope is lowered as the strain rate is decreased. For destructured clay (normally consolidated), a lower strain rate results in an increase in pore pressure generation during shearing, due to the tendency of the clay skeleton to creep, while the peak strength envelope remains the same. Nevertheless, from a quantitative standpoint, the increase in shear strength caused by an increase in strain rate is similar for both structured and normally consolidated clay, and it is linear for at least five log cycles of strain rate.