许健, 郑翔, 王掌权. 2018: 黄土边坡盐蚀剥落病害特征调查及其水盐迁移规律研究. 工程地质学报, 26(3): 741-748. DOI: 10.13544/j.cnki.jeg.2017-279
    引用本文: 许健, 郑翔, 王掌权. 2018: 黄土边坡盐蚀剥落病害特征调查及其水盐迁移规律研究. 工程地质学报, 26(3): 741-748. DOI: 10.13544/j.cnki.jeg.2017-279
    XU Jian, ZHENG Xiang, WANG Zhangquan. 2018: INVESTIGATION FOR WATER AND SALT MIGRATIONS ON SPALLING DISEASE OF LOESS SLOPE CAUSED BY SALIFICATION EROSION. JOURNAL OF ENGINEERING GEOLOGY, 26(3): 741-748. DOI: 10.13544/j.cnki.jeg.2017-279
    Citation: XU Jian, ZHENG Xiang, WANG Zhangquan. 2018: INVESTIGATION FOR WATER AND SALT MIGRATIONS ON SPALLING DISEASE OF LOESS SLOPE CAUSED BY SALIFICATION EROSION. JOURNAL OF ENGINEERING GEOLOGY, 26(3): 741-748. DOI: 10.13544/j.cnki.jeg.2017-279

    黄土边坡盐蚀剥落病害特征调查及其水盐迁移规律研究

    INVESTIGATION FOR WATER AND SALT MIGRATIONS ON SPALLING DISEASE OF LOESS SLOPE CAUSED BY SALIFICATION EROSION

    • 摘要: 通过现场调查及室内含水量和易溶盐分析试验开展了黄土边坡盐蚀剥落病害特征的研究。结果表明:盐蚀剥落病害按剥落形态可分为条带状、片块状及凹腔状盐蚀剥落;按地层岩性可分为马兰黄土、离石黄土、古土壤层及人工夯实黄土盐蚀剥落。试样含水量随着距边坡表层垂直深度增加而增大,含盐量随着距边坡表层垂直深度增加迅速降低且很快趋于稳定;阴离子CO32-和HCO3-含量随距边坡表层垂直深度增加无明显变化规律,Cl-和SO42-含量随距边坡表层垂直深度增加迅速减小且很快趋于稳定;阳离子K+、Mg2+、Ca2+含量随距边坡表层垂直深度增加无明显变化规律,Na+随距边坡表层垂直深度增加迅速减小且趋于稳定;阴离子以SO42-和Cl-为主,阳离子以Na+为主,边坡表层易溶盐主要成分为Na2SO4和NaCl。边坡表层富集易溶盐Na2SO4和NaCl,在气候变化条件下的反复溶解和结晶作用是黄土边坡盐蚀剥落病害的主要诱因。

       

      Abstract: The paper studies characteristic of spalling disease of loess slope caused by salification erosion through field investigation and indoor water content and soluble salt tests. The results show that the salification erosion spalling disease can be divided into strip-shape, sheet-shape and cavity-shape spalling on the basis of spalling shape. Furthermore, the salification erosion spalling disease can further be divided into Q3 loess, Q2 loess, paleosol layer and artificial compacted loess spalling according to the geological conditions. The water content of loess sample increases with the increment of vertical depth from slope surface. With the increase of vertical depth from slope surface, the total salt content decreases greatly and reaches a stable value soon. The CO32- and HCO3- ion contents have no obvious change rule with increasing vertical depth. With the increase of vertical depth, the Cl- and SO42- ion contents decrease greatly and reaches a stable value soon. The K+, Mg2+ and Ca2+ ion contents have no obvious change rule with increasing vertical depth. With the increase of vertical depth, the Na+ion content decreases greatly and reaches a stable value eventually. The SO42- and Cl- ion contents are higher in the anions with the Na+ ion content highest in the cations. Therefore, Na2SO4 and NaCl are the main components of soluble salt in soil on the surface of loess slope. Furthermore, Na2SO4 and NaCl repeatedly dissolve and crystallize under condition of climate change, which causes the spalling disease of loess slope.

       

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