| 马兰黄土渗气率与饱和渗透系数的关系研究 |
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| 引用本文： | 刘锦阳,李喜安,简涛,郭泽泽.马兰黄土渗气率与饱和渗透系数的关系研究[J].水文地质工程地质,2017,0(6):154-154. |
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| 作者姓名： | 刘锦阳 李喜安 简涛 郭泽泽 |
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| 作者单位： | 1 长安大学地质工程与测绘学院，陕西 西安710054；2 国土资源部岩土工程开放研究实验室，陕西 西安710054 |
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| 基金项目： | 国家自然科学基金资助项目(41572264，41172255，41440044) |
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| 摘 要： | 利用改进的ZC-2015型渗气仪和TST-55型渗透仪进行马兰黄土渗气和饱和渗透试验，确定稳定渗气率对应的稳定渗径，进而探讨渗气率ka和饱和渗透系数Kw的关系。研究结果表明: ka不仅能描述非饱和土孔隙和结构特征，也能用于预测Kw。气体渗气率随着渗径的增大而减小，最终趋于稳定，原状和重塑黄土的稳定渗径均约8 cm。ka和Kw间呈明显的双对数线性关系，不同深度的原状风干黄土和不同粒组的重塑土的lgka和lgKw间的相关性都比较明显，但原状风干黄土和重塑土之间的拟合公式有很大差异。另外，黏粒含量较高时，重塑土拟合直线的斜率β和截距α明显增大。不同含水率下，重塑土拟合公式有很大的差异，当含水率较大时，随着干密度的增大，ka的变化程度比Kw大，拟合直线的斜率β和截距α都有明显的减小。
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| 关 键 词： | 渗气率 稳定渗径 饱和渗透系数 双对数线性关系 马兰黄土 黏粒含量 |
| 收稿时间： | 2017-00-00 |
| 修稿时间： | 2017-00-00 |
A study of the relationship between gas permeability and saturated coefficient of permeability of the Malan loess |
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| LIU Jinyang,LI Xi’an,JIAN Tao,GUO Zeze.A study of the relationship between gas permeability and saturated coefficient of permeability of the Malan loess[J].Hydrogeology and Engineering Geology,2017,0(6):154-154. |
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| Authors: | LIU Jinyang LI Xi’an JIAN Tao GUO Zeze |
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| Institution: | 1 School of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi710054, China; 2 Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Xi’an, Shaanxi710054, China |
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| Abstract: | A series of gas and saturated penetration tests for the Malan loess are conducted by using the improved ZC-2015 air permeameter and TST-55 permeameter. We firstly determine the stable permeability diameter of the corresponding ka, and then explore the relationship between air permeability ka and saturation coefficient of permeability Kw. The research results show that ka not only describes the pore and structural characteristics of unsaturated soils, but also can be used to predict Kw. ka decreases with the increasing permeability diameter, and ultimately this trend becomes stabilized. The stable permeability of the undisturbed and remolded loess is 8 cm. There is a significant double-logarithmic linear relationship between ka and Kw, The correlation between lgka and lgKw of the remolded loess with different grain compositions and undisturbed loess in different depths are obvious, but the fitting formula between the undisturbed soil and the remolded soil is very different. In addition, when the content of clay particles is high, the slope β and intercept α of the remolded sample obviously increase. Under the different water content, the formula of the remolded soil is very different. when the water content, the change in ka is more than Kw with the increase of the dry density, and the slope β and the intercept α of fitting line are obviously reduce. |
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