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Stress-dilatancy relationships of sand in the simulation of volumetric behavior during cyclic torsional shear loadings

机译:循环扭剪荷载作用下体积行为模拟中砂土的应力-剪胀关系

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摘要

In order to describe the volumetric behavior of soil subjected to shearing, a relationship that deals with the ratio of plastic strain increments to stress ratio (i.e. a stress-dilatancy relationship) is required in addition to the stress-shear strain relationship. In view of the above, stress-dilatancy relationships during cyclic torsional shear loadings were experimentally investigated in the current study. Based on the experimental results, a bilinear non-unique stress-dilatancy model was proposed for stress controlled drained cyclic torsional shear loading. The stress-dilatancy relationships during virgin loading and subsequent cyclic loading were modeled separately by considering the effects of stress history (over-consolidation or normal consolidation). Then the volume change of Toyoura sand specimens subjected to cyclic torsional shear loading was simulated by combining the simulation of stress-shear strain relationship with the proposed stress-dilatancy relationships. It was observed from the comparison of the experiment results with the simulation of volumetric strain that, after combining with accurate modeling of stress-shear strain relationship, the proposed stress-dilatancy relationship can reasonably simulate the volumetric behavior of sand subjected to various drained cyclic torsional shear loadings.
机译:为了描述经受剪切的土壤的体积行为,除了应力-剪切应变关系之外,还需要处理塑性应变增量与应力比的比率的关系(即,应力-膨胀关系)。有鉴于此,在当前的研究中,通过实验研究了在扭转扭剪荷载作用下的应力-剪胀关系。基于实验结果,提出了一种用于应力控制的排水循环扭剪荷载的双线性非唯一应力-剪胀模型。通过考虑应力历史(过度固结或正常固结)的影响,分别对原始荷载和后续循环荷载期间的应力-剪胀关系进行建模。然后,通过将应力-剪切应变关系的模拟与所提出的应力-剪胀关系相结合,来模拟Toyoura砂试样在循环扭转剪切载荷下的体积变化。从实验结果与体积应变模拟的比较可以看出,结合精确的应力-剪切应变关系模型,提出的应力-剪胀关系可以合理模拟各种排水循环扭转作用下砂土的体积行为。剪切载荷。

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