| 摘要: |
| 以凹凸棒土为改良隔离墙材料，通过渗透试验分析凹凸棒土掺量、苯酚质量浓度和干湿/冻融循环作用对隔离墙渗透系数的影响，结合核磁共振试验研究隔离墙孔隙结构，讨论凹凸棒土的掺入对干湿/冻融循环作用下隔离墙防渗效果的影响.结果表明：隔离墙渗透系数随凹凸棒土掺量增大而减小，随干湿/冻融循环次数增加而增大，不随苯酚质量浓度变化而变化；凹凸棒土可使干湿/冻融循环作用下隔离墙的渗透系数降低，且随着干湿/冻融循环次数的增加，隔离墙中小孔隙分布减少，中孔隙增多；凹凸棒土可增强隔离墙的防渗效果，亦可抑制干湿/冻融循环作用对其产生的破坏；冻融循环作用对隔离墙渗透系数及孔隙结构的影响大于干湿循环作用. |
| 关键词: 凹凸棒土 隔离墙 渗透系数 孔隙结构 干湿 冻融 |
| DOI：10.3969/j.issn.1007-9629.2022.05.015 |
| 分类号:X53 |
| 基金项目:内蒙古自治区自然科学基金资助项目（2019MS05059） |
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| Permeability and Pore Structure of Improved Isolation Wall under the Action of Dry-Wet/Freeze-Thaw Cycles |
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LIU Ke1, LIU Lin1,2, ZHANG Yongpeng1
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1.College of Civil Engineering， Inner Mongolia University of Technology， Hohhot 010051， China;2.Key Laboratory of Civil Engineering Structure and Mechanics of Inner Mongolia， Inner Mongolia;University of Technology， Hohhot 010051， China
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| Abstract: |
| Using attapulgite as the improved isolation wall material， the effects of attapulgite content， phenol concentration， the action of dry-wet or freeze-thaw cycles on the permeability coefficient of the isolation wall were invesgated through permeability test. Combined with nuclear magnetic resonance test， the internal pore structure was studied， and the influence of attapulgite on the anti-seepage effect of the isolation wall was discussed. The results show that the permeability coefficient decreases with the increase of attapulgite content， and increases with the increase of dry-wet or freeze-thaw cycles， and does not change with the change of phenol concentration. Attapulgite can reduce the permeability coefficient of the isolation wall under the action of dry-wet or freeze-thaw cycles，and the distribution of small pores in the isolation wall decreases and the number of mesopores increases with the increase of dry-wet or freeze-thaw cycles. Attapulgite can enhance the anti-seepage effect of the isolation wall， and also restrain the damage caused by the action of dry-wet or freeze-thaw cycles. The effect of freeze-thaw cycles on permeability coefficient and pore structure of isolation wall is greater than that of dry-wet cycles. |
| Key words: attapulgite isolation wall permeability coefficient pore structure dry-wet freeze-thaw |
