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首页> 外文期刊>Journal of Zhejiang University. Science, A >Effects of clay content on the volumetric behavior of loess under heating-cooling cycles
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Effects of clay content on the volumetric behavior of loess under heating-cooling cycles

机译：加热循环下粘土含量对黄土体积特性的影响

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Although numerous studies have been carried out on investigating thermal volume changes in different soils, limited attention has been paid to loess. This study aims to investigate the effects of clay content on the deformation of loess under heating-cooling cycles. Three soils with different clay contents (i.e. SA: 7%; SB: 13%; SC: 35%) were prepared with loess collected in situ through the sedimentation method. The soil volume changes were measured under heating-cooling cycles by using a thermal invar oedometer. To interpret the experimental results, X-ray diffraction (XRD) and scanning electron microscope (SEM) tests were conducted to identify the composition and microstructure of tested soils, respectively. The results show that the plastic axial strains of SA, SB, and SC accumulate to a certain level with the increasing number of heating-cooling cycles. At the stable state, the plastic axial strain of SC is 264% and 52% larger than those of SA and SB, respectively. On the other hand, the linear thermal expansion coefficient of SC is 66% and 20% larger than those of SA and SB, respectively. As evidenced from the XRD test, the clay in loess mainly contains kaolinite, chlorite, and illite, while the composition of silt is dominated by quartz. The clay minerals are more sensitive to thermal fluctuations than quartz because of the electrical double layer. SC, whose clay content is deliberately enhanced, exhibits a larger plastic axial strain and linear thermal expansion coefficient than do SA and SB.
机译：尽管已经进行了许多研究以研究不同土壤中的热量变化，但是对黄土的关注却很少。本研究的目的是研究加热-冷却循环下粘土含量对黄土变形的影响。用沉降法原位收集黄土，制备了三种具有不同粘土含量的土壤（SA：7％; SB：13％; SC：35％）。土壤体积的变化是在热-冷却循环中通过使用热膨胀金属膨胀计测量的。为了解释实验结果，分别进行了X射线衍射（XRD）和扫描电子显微镜（SEM）测试，以确定被测土壤的组成和微观结构。结果表明，随着加热-冷却循环次数的增加，SA，SB和SC的塑性轴向应变积累到一定水平。在稳定状态下，SC的塑性轴向应变分别比SA和SB的塑性轴向应变大264％和52％。另一方面，SC的线性热膨胀系数分别比SA和SB的线性热膨胀系数大66％和20％。 X射线衍射测试表明，黄土中的粘土主要包含高岭石，绿泥石和伊利石，而粉砂的成分则以石英为主。由于具有双电层，粘土矿物比石英对热波动更敏感。故意增加粘土含量的SC与SA和SB相比，表现出更大的塑性轴向应变和线性热膨胀系数。

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