高温及碱性条件对高庙子钠基膨润土膨胀力的影响

doi:10.16285/j.rsm.2020.1779

岩土力学 ›› 2021, Vol. 42 ›› Issue (8): 2160-2172.doi: 10.16285/j.rsm.2020.1779

高温及碱性条件对高庙子钠基膨润土膨胀力的影响

刘俊新^{1, 2, 3}，唐伟^{1, 2}，李军润^{1, 2}，张建新^{1, 2}，郭招群^{1, 2}，陈龙^{1, 2}，刘育田^{1, 2}

1. 西南科技大学工程材料与结构冲击振动四川省重点实验室，四川绵阳 621010；2. 西南科技大学土木工程与建筑学院，四川绵阳 621010； 3. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉 430071

收稿日期:2020-11-30 修回日期:2021-03-23 出版日期:2021-08-11 发布日期:2021-08-16
通讯作者: 唐伟，男，1993年生，博士研究生，主要从事岩土力学方面的研究工作。E-mail: 943099404@qq.com E-mail:ljx0614@126.com
作者简介:刘俊新，男，1976年生，博士（后），教授，主要从事岩土力学与土体稳定性评价方面的研究工作
基金资助:
“十三五”国家重点研发计划（No. 2017YFC0804600）。

An experimental research on swelling pressure of GMZ Na-bentonite submitted to the strong alkali-heat environment

LIU Jun-xin^{1, 2, 3}, TANG Wei^{1, 2}, LI Jun-run^{1, 2}, ZHANG Jian-xin^{1, 2}, GUO Zhao-qun^{1, 2}, CHEN Long^{1, 2}, LIU Yu-tian¹, 2

1. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; 2. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China

Received:2020-11-30 Revised:2021-03-23 Online:2021-08-11 Published:2021-08-16
Supported by:
This work was supported by the “13th Five-Year” National Key R&D Program of China(2017YFC0804600).

摘要/Abstract

摘要： 为研究长期强碱-热作用下高庙子钠基膨润土膨胀力的劣化效应，针对内蒙古兴和县高庙子钠基膨润土，设计了24组试验，试验条件为：NaOH浓度为0.5 mol/L，碱-热温度为25、90、150、210 ℃，时长为2、4、6、8、10、12个月。对碱-热处理后的膨润土进行X射线衍射（XRD）试验，采用自制膨胀仪对初始干密度为1.7 g/cm3的膨润土试样进行恒体积膨胀力试验，渗透介质为蒸馏水，结果表明：（1）随着碱-热时长及温度的提高，蒙脱石含量、最大膨胀力和水化反应时长均减小；（2）径向与竖向最大膨胀力的比值为0.5左右，与碱-热条件无关；（3）基于膨胀力损伤因子和老化时长缩减因子建立膨胀力随时间演化的调动函数，该模型较好地预测了各碱-热环境下膨胀力时程曲线；（4）损伤增量由碱-热温度或时长下的损伤速率决定，温度会促进膨胀力劣化效应。

关键词: 碱-热作用, 高庙子钠基膨润土, 膨胀力, 劣化效应, 调动函数

Abstract: In order to study the deterioration effect of swelling pressure of Gaomiaozi sodium bentonite under long-term strong alkali- heat action, 24 groups of orthogonal optimization-tests were designed for Gaomiaozi sodium bentonite from Xinghe County, Inner Mongolia. The test conditions were as follows: one NaOH concentration (0.5 mol/L), four alkali-heat temperatures (25, 90, 150 and 210 ℃), six alkali-heat interaction durations (2, 4, 6, 8, 10 and 12 months). X-ray diffraction (XRD) tests were performed on the bentonite after alkali-heat treatment, and constant volume swelling (CVS) experiments were carried out on the bentonite sample with the initial dry density of 1.7 g/cm3 using self-made 2D swelling-apparatus, with the distilled water as an infiltration medium. The results showed that: 1) With the increase of the time and temperature under alkali-heat interaction, the content of montmorillonite, the maximum swelling pressure and the hydration time decreased; 2) The characteristic curve of swelling pressure-hydration time tended to be stable and was independent of the strong alkali-heat condition when the ratio of the maximum radial and vertical swelling pressures was 0.5; 3) A transferring-function of swelling pressure with hydration-time was established on the basis of damaging-factor of swelling pressure and accelerating-factor of aging duration, the model can better predict the experimental data; 4) A total damage increment was mostly attributed to the coupling effect of damage rate of temperature and time under the alkali-heat interaction, additionally, there was an accelerating effect of the degradation characteristic of swelling pressure facilitated by an increasing temperature.

Key words: alkali-heat effect, GMZ Na-bentonite, swelling pressure, degradation effect, alteration function

中图分类号:

TU 443

刘俊新, 唐伟, 李军润, 张建新, 郭招群, 陈龙, 刘育田, . 高温及碱性条件对高庙子钠基膨润土膨胀力的影响[J]. 岩土力学, 2021, 42(8): 2160-2172.

LIU Jun-xin, TANG Wei, LI Jun-run, ZHANG Jian-xin, GUO Zhao-qun, CHEN Long, LIU Yu-tian, . An experimental research on swelling pressure of GMZ Na-bentonite submitted to the strong alkali-heat environment[J]. Rock and Soil Mechanics, 2021, 42(8): 2160-2172.

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高温及碱性条件对高庙子钠基膨润土膨胀力的影响

An experimental research on swelling pressure of GMZ Na-bentonite submitted to the strong alkali-heat environment

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