NaCl溶液改良膨胀土滞回曲线形态特征
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国家自然科学基金(42007257);陕西省黄土力学与工程重点实验室项目(LME201801);陕西省教育厅专项科研计划项目(20JK0670)


Study on Morphology Characteristics of Hysteresis Curve of Expansive Soil Improved by Sodium Chloride Solution
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    摘要:

    为研究NaCl溶液改良膨胀土滞回曲线变化规律,基于GDS动三轴仪,开展了不同NaCl溶液浓度和固结围压条件下膨胀土的动三轴试验研究,通过四个特征参数:长轴斜率(k)、内面积(S)、不闭合大小(εp)和饱满度(α)分别对滞回曲线的应变轴倾斜程度、面积大小程度、不闭合程度和宽窄程度进行形态特征的定量描述。结果表明:膨胀土滞回曲线呈斜椭圆形;相同NaCl溶液浓度下,随着加载围压的增大,k值增大,S值、εp值和α值均呈非线性衰减;相同加载围压下,随着NaCl溶液浓度的增大,εp值减小,S值、k值和α值均呈非线性增大;不同加载条件下,S值和α值有类似的变化关系,当动应变小于0.1%时,S值和α值基本无变化,随着动应变逐渐增大,S值和α值呈指数形式迅速增大;与未改良膨胀土相比,经NaCl溶液改良后膨胀土滞回曲线k值,S值和α值均增大,εp值减小。综合分析,NaCl溶液改良膨胀土的动力特性较未改良土有显著提高。

    Abstract:

    To study the change law of hysteresis curve of expansive soil improved by Sodium Chloride Solution, based on GDS dynamic triaxial tests, the dynamic triaxial test of expansive soil under different concentrations of sodium chloride solution and different consolidation confining pressures was carried out. By four characteristic parameters: long axis slope (k), internal area (S), non-closure (εp) and fullness (α) were used to quantitatively describe the degree of strain axis tilt, area size, non-closure degree and width of hysteresis curve. The results showed that: The hysteresis curve of expansive soil is oblique ellipse; under the same sodium chloride solution concentration, as the loading confining pressure increases, k increases, and S, εp and α all decrease non-linearly; under the same loading confining pressure, as the concentration of sodium chloride solution increases, εp decreases, and S, k, and α all increase non-linearly; under different loading conditions, S and α have a similar change relationship, when the dynamic strain is less than 0.1%, there is no change in S and α, as the dynamic strain gradually increases, S and α increase exponentially; compared with unimproved expansive soil, the hysteresis curve k, S and α of expansive soil improved by Sodium chloride solution increase, and the value of εp decreases. Comprehensive analysis shows that the dynamic characteristics of the expansive soil modified with sodium chloride solution are significantly improved compared with that of the unmodified soil.

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李宝平,支枭雄,张玉,等. NaCl溶液改良膨胀土滞回曲线形态特征[J]. 科学技术与工程, 2022, 22(13): 5322-5330.
Li Baoping, Zhi Xiaoxiong, Zhang Yu, et al. Study on Morphology Characteristics of Hysteresis Curve of Expansive Soil Improved by Sodium Chloride Solution[J]. Science Technology and Engineering,2022,22(13):5322-5330.

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历史
  • 收稿日期:2021-06-18
  • 最后修改日期:2022-01-25
  • 录用日期:2021-11-16
  • 在线发布日期: 2022-05-20
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