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    真空冷冻干燥和烘干对滑带土孔隙特征的影响试验

    崔德山 项伟 陈琼 刘清秉 郎林智 吴益平

    崔德山, 项伟, 陈琼, 刘清秉, 郎林智, 吴益平, 2014. 真空冷冻干燥和烘干对滑带土孔隙特征的影响试验. 地球科学, 39(10): 1431-1437. doi: 10.3799/dqkx.2014.135
    引用本文: 崔德山, 项伟, 陈琼, 刘清秉, 郎林智, 吴益平, 2014. 真空冷冻干燥和烘干对滑带土孔隙特征的影响试验. 地球科学, 39(10): 1431-1437. doi: 10.3799/dqkx.2014.135
    Cui Deshan, Xiang Wei, Chen Qiong, Liu Qingbing, Lang Linzhi, Wu Yiping, 2014. Pore Characteristics of Sliding Zone Soils of Huangtupo Landslide by Vacuum Freeze-Dried and Dried Methods. Earth Science, 39(10): 1431-1437. doi: 10.3799/dqkx.2014.135
    Citation: Cui Deshan, Xiang Wei, Chen Qiong, Liu Qingbing, Lang Linzhi, Wu Yiping, 2014. Pore Characteristics of Sliding Zone Soils of Huangtupo Landslide by Vacuum Freeze-Dried and Dried Methods. Earth Science, 39(10): 1431-1437. doi: 10.3799/dqkx.2014.135

    真空冷冻干燥和烘干对滑带土孔隙特征的影响试验

    doi: 10.3799/dqkx.2014.135
    基金项目: 

    国家自然科学基金项目 41002102

    国家自然科学基金项目 41272308

    国家自然科学基金项目 41272307

    国家自然科学基金项目 41202199

    详细信息
      作者简介:

      崔德山(1981-), 男, 副教授, 博士, 主要从事岩土体工程性质的试验研究.E-mail: cuideshan1981@gmail.com

    • 中图分类号: P642

    Pore Characteristics of Sliding Zone Soils of Huangtupo Landslide by Vacuum Freeze-Dried and Dried Methods

    • 摘要: 采用水蒸气吸附法和恒速压汞法测定了三峡库区巴东县黄土坡滑坡Ⅰ号支洞滑带土在真空冷冻干燥和烘干状态下的孔隙特征.研究表明,滑带土烘干样中墨水瓶形孔道内水分子发生凝聚、堵塞,导致其比表面积和吸附水蒸气的能力均小于滑带土冻干样.滑带土烘干样失水收缩,团粒结构更紧密,滑带土吸附势减小,在微孔区间其累积孔隙体积和最大孔隙体积均小于滑带土冻干样.在考虑水蒸气表面张力情况下,滑带土冻干样吸附和脱附的孔隙表面分形维数均大于烘干样,说明烘干样失水后在各种化学键引力作用下使孔隙表面更趋于平滑.压汞实验结果表明在微孔和中孔区间,冻干滑带土的孔隙直径和孔隙体积均大于烘干样,但孔隙直径在0.133~129.051 μm区间,烘干样的孔隙体积大于冻干样,且直径大于41.421 μm的颗粒体积比冻干样大.

       

    • 图  1  黄土坡滑坡Ⅰ号支洞滑带土

      Fig.  1.  Sliding zone soils in branch tunnel Ⅰ of Huangtupo landslide

      图  2  滑带土烘干样与冻干样的水蒸气等温吸附-脱附曲线

      Fig.  2.  Absorption and desorption isotherms of water vapor gas of dried and freeze-dried sliding zone soils

      图  3  滑带土烘干样与冻干样的多点BET测试结果

      Fig.  3.  Multi-point BET of dried and freeze-dried sliding zone soils

      图  4  滑带土冻干样和烘干样的累计孔隙体积

      Fig.  4.  Total pore volume of freeze-dried and dried sliding zone soils

      图  5  滑带土冻干样和烘干样的表面分形维数

      Fig.  5.  Surface fractal dimension of freeze-dried and dried sliding zone soils

      图  6  滑带土冻干样与烘干样的进汞与退汞曲线

      Fig.  6.  Mercury intrusion and extrusion of dried and freeze-dried sliding zone soils

      图  7  滑带土烘干样与冻干样的压汞孔隙分布

      Fig.  7.  Mercury intrusion distribution of dried and freeze-dried sliding zone soils

      图  8  MS颗粒大小分布曲线

      Fig.  8.  Particle size distribution by MS method

      表  1  滑带土基本性质指标

      Table  1.   Basic index of sliding zone soils in branch tunnelⅠof Huangtupo landslide

      天然含水率(%) 密度(g·cm-3) 饱和度(%) 液限(%) 塑限(%) 塑性指数
      11~14 2.32 83.5 28.38 17.12 11.26
      下载: 导出CSV

      表  2  黄土坡滑坡Ⅰ支洞滑带土的矿物组成(%)

      Table  2.   Mineral composition of sliding zone soils in branch tunnel Ⅰ of Huangtupo landslide (%)

      矿物成分 石英 长石 方解石 蒙脱石 绿泥石 伊利石
      滑带土 26 4 30 10 4 26
      下载: 导出CSV

      表  3  黄土坡滑坡Ⅰ支洞滑带土的化学全量分析结果(%)

      Table  3.   Chemical component of sliding zone soils in branch tunnel Ⅰ of Huangtupo landslide (%)

      氧化物 SiO2 Al2O3 Fe2O3 MgO CaO Na2O
      滑带土 41.25 11.00 4.16 1.51 18.54 0.15
      氧化物 K2O TiO2 P2O5 MnO H2O 烧失量
      滑带土 2.24 0.53 0.10 0.04 2.80 20.48
      下载: 导出CSV

      表  4  黄土坡滑坡Ⅰ支洞滑带土的易溶盐(g/kg)

      Table  4.   Soluble salt of sliding zone soils in branch tunnel Ⅰ of Huangtupo landslide (g/kg)

      易溶盐 pH值 HCO3- Cl- SO42- Ca2+ Mg2+ K++Na+ 易溶盐总量
      滑带土 6.36 0.366 0.014 0.048 0.076 0.015 0.060 0.579
      下载: 导出CSV

      表  5  滑带土冻干样与烘干样的表面分形维数

      Table  5.   Fractal dimension of dried and freeze-dried sliding zone soils

      样品名称 吸附/脱附阶段 考虑吸附质表面张力 相关系数
      冻干样 脱附 2.871 7 0.986
      吸附 2.841 6 0.857
      烘干样 脱附 2.861 5 0.910
      吸附 2.827 7 0.936
      下载: 导出CSV

      表  6  恒速压汞实验结果

      Table  6.   Data of constant-rate mercury injection

      样品名称 重量(g) 压力范围(kPa) 孔隙直径(nm) 孔隙体积(10-3 L·g-1) 比表面积(m2·g-1)
      滑带土冻干样 0.486 6 6.247~204 916.122 235 338.59~7.18 0.105 7 15.638 6
      滑带土烘干样 0.799 4 6.267~204 779.881 234 692.59~7.18 0.114 0 13.981 9
      下载: 导出CSV
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    • 收稿日期:  2014-01-04
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