土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (4): 582-584.

• 专题论述 • 上一篇    下一篇

温度对黏性土中孔隙水状态的影响

吴江鹏   

  1. （桂林理工大学广西建筑新能源与节能重点实验室，广西桂林 541004）
  • 收稿日期:2021-02-21 修回日期:2021-03-10 出版日期:2022-08-30 发布日期:2022-08-25
  • 作者简介:吴江鹏（1996-），男，硕士，研究方向为核磁共振在岩土工程中的应用等。
  • 基金资助:
    国家自然科学基金(42072312,51639008)

Effect of Temperature on Pore Water State in Cohesive Soil

WU Jiangpeng   

  1. (Guangxi Key Laboratory for Building New Energy and Energy Conservation, Guilin University of Technology, Guilin 541004)
  • Received:2021-02-21 Revised:2021-03-10 Online:2022-08-30 Published:2022-08-25

摘要： 采用核磁共振设备测试了18～75 ℃范围内三种饱和压实黏性土的横向弛豫时间随温度的变化。测量了三种黏土中孔隙水的表观活化能 ΔE，具有最大比表面积和阳离子交换能力的土A具有最大的 ΔE ，对于土B和土C, ΔE <0。这种异常的现象可能是由于这两种黏性土中的黏土矿物中含有较高的高岭石和伊利石，这两种矿物表面吸附水分子吸附能较高。最后定性分析了不同种类黏土的渗透系数随温度的变化。正的 ΔE 表明,土A的渗透系数随温度升高而增加；负的ΔE 表明，土B和土C的渗透系数随温度升高而减小。

关键词: 温度, 横向驰豫时间, 黏性土, 孔隙水状态, 表观活化能

Abstract: The variation of transverse relaxation time of three types of saturated compacted cohesive soil samples with temperature from 18 ℃ to 75 ℃ was measured by the nuclear magnetic resonance (NMR). The apparent activation energy ΔE of pore water in three types of cohesive soil samples was measured. The soil sample A with the largest specific surface area and the cation exchange capacity has the largest ΔE. For the soil samples B and C, ΔE < 0. This abnormal phenomenon may be due to the high content of kaolinite and illite in the clay minerals of these two cohesive soil samples, and the high adsorption energy of water molecules on the surface of these two minerals. Finally, the change of permeability coefficient of different types of cohesive soil samples with temperature is qualitatively analyzed. The positive ΔE indicates that the permeability coefficient of soil sample A increases with the increase of temperature; Negative ΔE indicates that the permeability coefficient of soil samples B and C decreases with the increase of temperature.

Key words: Temperature Effect, Transverse Relaxation Time, Cohesive Soil, Pore Water State, Apparent Activation Energy

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