| 膨润土防水毯渗透性能的温度效应 |
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| 引用本文： | 何俊,颜兴,王小琦,万娟. 膨润土防水毯渗透性能的温度效应[J]. 水文地质工程地质, 2018, 0(1): 75-82 |
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| 作者姓名： | 何俊 颜兴 王小琦 万娟 |
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| 作者单位： | 湖北工业大学土木建筑与环境学院，湖北 武汉430068 |
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| 基金项目： | 国家自然科学基金项目资助(51608182；51409097)；湖北省高等学校优秀中青年科技创新团队计划项目资助（T201605） |
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| 摘 要： | 以颗粒状钠基膨润土防水毯为研究对象，采用改造的GDS全自动环境岩土渗透仪开展渗透试验，研究温度和压力对渗透系数的影响。研究表明:低围压下膨润土防水毯的渗透系数随温度的增加而减小，温度较高时趋于平缓或略有增大；围压增为100 kPa时，渗透系数随温度的增加而增大。固有渗透率随温度的增加而减小；低围压下固有渗透率减小更显著，仅考虑流体物理性质变化的渗透系数估算值与实测值有很大差异。膨润土吸附结合水量随温度的升高而减小，不能解释膨润土防水毯渗透系数和固有渗透率随温度的变化规律。当温度升高时，粒间孔隙减小且颗粒状膨润土分解成凝胶态蒙脱石颗粒，在低围压下凝胶态蒙脱石颗粒层间距离减小，是渗透系数和固有渗透率随温度的升高而减小的主要原因。
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| 关 键 词： | 颗粒状膨润土 膨润土防水毯 渗透性 温度效应 结合水 凝胶态蒙脱石颗粒 |
| 收稿时间： | 2017-06-14 |
| 修稿时间： | 2017-07-18 |
Temperature effects of geosynthetic clay liner on hydraulic conductivity |
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| HE Jun,YAN Xing,WANG Xiaoqi,WAN Juan. Temperature effects of geosynthetic clay liner on hydraulic conductivity[J]. Hydrogeology and Engineering Geology, 2018, 0(1): 75-82 |
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| Authors: | HE Jun YAN Xing WANG Xiaoqi WAN Juan |
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| Affiliation: | College of Civil and Architectural Engineering, Hubei University of Technology, Wuhan, Hubei430068, China |
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| Abstract: | The hydraulic tests were conducted on geosynthetic clay liners (GCL) containing granular Na-bentonite under different temperatures and pressures, using the GDS geoenvironmental permeameter. Under low pressures, the hydraulic conductivity decreases with the temperature, and will be gentle or slightly increases when the temperature is over 50-60 ℃. Nevertheless, the hydraulic conductivity decreases with the temperature under the pressure of 100 kPa. The intrinsic permeability decreases with the temperature, which is more significantly under low pressures. Therefore, a great difference exists between the estimated and the measured hydraulic conductivities when only considering the change in physical properties of the fluid with temperature. The adsorbed water content of bentonite decreases with the temperature, resulting in the estimated hydraulic conductivity less than the measured value and intrinsic permeability increasing with temperature, which cannot explain the permeability of GCL. With the increasing temperature, the granular bentonite will transform into the montmorillonite gel. Under low pressure, the distance between montmorillonite in intraparticle pore decreases with temperature, resulting in the decrease in hydraulic conductivity and intrinsic permeability. |
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