李喜安, 刘锦阳, 郭泽泽, 张凯旋, 孟杰. 2018: 马兰黄土孔隙结构参数与渗透性关系研究. 工程地质学报, 26(6): 1415-1423. DOI: 10.13544/j.cnki.jeg.2017-551
    引用本文: 李喜安, 刘锦阳, 郭泽泽, 张凯旋, 孟杰. 2018: 马兰黄土孔隙结构参数与渗透性关系研究. 工程地质学报, 26(6): 1415-1423. DOI: 10.13544/j.cnki.jeg.2017-551
    LI Xi'an, LIU Jinyang, GUO Zeze, ZHANG Kaixuan, MENG Jie. 2018: STUDY ON RELATIONSHIP BETWEEN PORE STRUCTURE PARAMETERS AND PERMEABILITY OF MALAN LOESS. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1415-1423. DOI: 10.13544/j.cnki.jeg.2017-551
    Citation: LI Xi'an, LIU Jinyang, GUO Zeze, ZHANG Kaixuan, MENG Jie. 2018: STUDY ON RELATIONSHIP BETWEEN PORE STRUCTURE PARAMETERS AND PERMEABILITY OF MALAN LOESS. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1415-1423. DOI: 10.13544/j.cnki.jeg.2017-551

    马兰黄土孔隙结构参数与渗透性关系研究

    STUDY ON RELATIONSHIP BETWEEN PORE STRUCTURE PARAMETERS AND PERMEABILITY OF MALAN LOESS

    • 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及饱和渗透试验,得到两个渗透性参数渗气率ka和饱和渗透系数Kw,通过室内常规试验得到的孔隙比e,并利用图像处理软件(IPP)处理扫描电镜(SEM)照片得到的平面孔隙比e0,结合试验结果并利用数学模型建立宏-微观孔隙参数与渗透参数之间的关系。结果表明:重塑土干密度增大,单位体积内颗粒数量增多,孔隙面积减少。原状风干土样埋深增大,大孔和中孔的孔隙面积、孔隙数量、孔隙平均直径明显减小;半对数线性模型可以消除Kwka与孔隙结构参数在量级上的差异,拟合效果更好。lgKw、lgkaee0之间都呈现较好的线性关系;含水率变化时,渗气率拟合直线的斜率和截距的变化规律更明显。重塑土由于制样均匀,曲线的拟合度更高,而不同深度的原状黄土试样由于沉积过程造成的结构性的差异,致使其拟合度较重塑土偏低。

       

      Abstract: A series of gas permeability and saturated penetration tests on Malan loess are accomplished by using the improved ZC-2015 air permeameter and TST-55 permeameter. We obtain two permeability parameters of gas permeability ka and saturation permeability coefficient Kw respectively. The void ratio e is acquired by laboratory normal experiment. And the planar void ratio e0 is obtained from electron microscopy(SEM)which is analyzed by image-pro plus(IPP). Then combining with the test results and using mathematical model, the relationship between macroscopic and microcosmic pore parameters and infiltration parameters are established. The results show that dry density of remolded soils increases, the number of particles per unit volume increases, porosity area decreases. The buried depth of undisturbed dry loess samples increases. Soil pore area and pore number, the average pore diameter of macropores and mesopores in loess significantly decrease. The semi-logarithmic linear model can eliminate the magnitude difference between Kw, ka and the pore structure parameters, and the fitting results is better. lgKw and lgka with e, e0 show a good linear relationships. When the water content changes, the regulation of slope and intercept about the gas permeability fit lines change obviously. Due to uniform sample preparation, fitting curves of remolded soils show the high fitting degree. Comparing with the remolded loess, fitting degree of undisturbed loess in different depth is low because of structural difference of deposition process.

       

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