Shear strength of overconsolidated clay for repeats of pore water pressure loading
Shear strength of overconsolidated clay for repeats of pore water pressure loading
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重复孔隙水压力荷载的超固结粘土的剪切强度
DOI：
10.3313/jls.41.5_475
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Tsukasa Iwabe
中科院分区：
文献类型：
--
作者：
S. Ohtsuka;Y. Miyata;Tsukasa Iwabe
本文通过实验测试和模型模拟来描述重复孔隙水压力荷载下粘土剪切强度的变化。在恒定偏应力下增加孔隙水压力来模拟滑坡中的土壤行为。对于重复的孔隙水压力加载，获得了恒定的孔隙水压力屈服应力，但获得了破坏应力降低。失效应力由孔隙率和有效平均应力空间构成失效包络线。这展示了孔隙水压力加载循环期间由于重复破坏而引起的土体剪切强度和状态变量的变化过程。在孔隙水压力荷载下，粘土因膨胀而发生应变软化，剪切强度降低。相反，剪切强度的恢复是通过卸荷时的固结效应来实现的。由于孔隙水压力加载循环的两个相反的影响，破坏应力会发生变化。研究发现，孔隙水压力的破坏应力接近于重复孔隙水压力加载循环中两种相反效应之间的平衡。
This paper represents the change in shear strength of clay for repetitive pore water pressure loading with the use of both experimental tests and model simulation. Pore water pressure was increased under constant deviator stress to simulate the soil behavior in landslide. Yield stress in pore water pressure was obtained constant for repeats of pore water pressure loading, but failure stress was obtained to decrease. Failure stresses constituted the failure envelopment line in void ratio and effective mean stress space. This exhibits the process of change in both shear strength and state variable of soil caused by repetitive failures during pore water pressure loading cycles. In pore water pressure loading, the strain softening of clay develops due to dilation and the shear strength decreases. On the contrary, the shear strength recovery develops by consolidation effect in unloading. Failure stress varies due to two opposite effects of pore water pressure loading cycle. It was found the failure stress in pore water pressure approached to the balanced one between two opposite effects in repetitive pore water pressure loading cycles.