收稿日期: 2015-12-03
网络出版日期: 2017-10-30
基金资助
国家自然科学基金资助项目(1162172)
Influence of temperature on swelling characteristics of GMZ bentonite due to wetting
Received date: 2015-12-03
Online published: 2017-10-30
对取自内蒙古高庙子地区的GMZ07 钠基膨润土在不同温度下进行了浸水饱和引起的膨胀特性试验. 在不同温度条件下对不同初始干密度试样在100～600 kPa的竖向荷载作用下进行了浸水饱和的膨胀变形及膨胀力试验. 试验结果表明: 在初始含水率相同的情况下, 浸水饱和引起的变形主要取决于干密度和竖向荷载, 对温度也有一定的影响, 但不是很显著; 在相同干密度和温度的情况下, 竖向荷载越大, 浸水变形稳定后孔隙比越小, 且孔隙比与竖向压力在半对数坐标中呈线性关系; 在相同温度和相同竖向荷载情况下, 不同的初始干密度试样在浸水变形稳定后的孔隙比相近. 此外, 随着温度的升高, 膨胀力略微减小.
蒋江红, 孙德安 . 温度对高庙子膨润土浸水膨胀特性的影响[J]. 上海大学学报(自然科学版), 2017 , 23(5) : 762 -771 . DOI: 10.12066/j.issn.1007-2861.1728
A series of wetting tests on GMZ07 Na-bentonite, taken from Gaomiaozi area, Inner Mongolia, were performed to investigate the swelling characteristics at different temperatures. The influences of temperature and initial dry density were studied under a vertical pressure ranging from 100 to 600 kPa. The test results show that deformation due to wetting is mainly affected by dry density and vertical pressure, and slightly affected by temperature. With the same initial dry density and temperature, the greater the vertical pressure, the less the void ratio after saturation. There is a linear relation between saturated void ratio and logarithm of vertical pressure. At the same temperature and vertical pressure, void ratios after saturation for different initial dry densities are similar. In addition,
swelling pressure decreases slightly with increasing temperature.
Key words： swelling characteristics; temperature; wetting; bentonite
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