| 细粒硫酸钠盐渍土盐冻胀特性试验研究 |
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| 引用本文： | 于天佑,吴亚平,司培国,张磊,孔令楠,蒲增钢.细粒硫酸钠盐渍土盐冻胀特性试验研究[J].冰川冻土,2019,41(2):407-210. |
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| 作者姓名： | 于天佑 吴亚平 司培国 张磊 孔令楠 蒲增钢 |
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| 作者单位： | 1.兰州交通大学 土木工程学院,甘肃 兰州 730070;
2.中铁二院工程集团有限责任公司,四川 成都 610031 |
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| 基金项目： | 中国铁路总公司科技研究开发计划项目(2015G005-C)资助 |
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| 摘 要： | 为探究温度与硫酸钠含量对细粒硫酸钠盐渍土盐冻胀率及盐胀占比的影响,取兰州黄土作为素土人工配盐,用平衡公式进行理论推导,并设计了室内试验对其进行验证。结果表明：当压实度为92%、含水率为最优含水率16.8%时,随着含盐量的升高,细粒硫酸钠盐渍土的冻结温度随硫酸钠含量的增大而降低,且随着温度的降低,盐胀率的变化趋势与盐冻胀率基本一致。在冻结温度以下至-5 ℃盐胀发展速度最快,在-5 ℃以下盐胀率增长很小;在压实度为92%、含水率为最优含水率16.8%条件下,在硫酸钠含量不变时,温度越低,盐胀占比越大;温度不变时,硫酸钠含量越高,盐胀占比越大,在冻结温度以上盐胀占比为100%,但当温度降至-3~-4 ℃时盐胀占比降到50%,在-10 ℃以下盐胀占比基本保持不变。
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| 关 键 词： | style="font-size:14px font-family:宋体 color:black 兰州黄土" target="_blank">">兰州黄土 盐冻胀 细粒盐渍土 硫酸钠含量 盐胀占比 |
| 收稿时间： | 2018-07-09 |
| 修稿时间： | 2018-11-26 |
Experimental study of
salt-frost heave characteristics of fine-grained sodium sulfate saline soil |
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| YU Tianyou,WU Yaping,SI Peiguo,ZHANG Lei,KONG Lingnan,PU Zenggang.Experimental study of
salt-frost heave characteristics of fine-grained sodium sulfate saline soil[J].Journal of Glaciology and Geocryology,2019,41(2):407-210. |
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| Authors: | YU Tianyou WU Yaping SI Peiguo ZHANG Lei KONG Lingnan PU Zenggang |
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| Institution: | 1.School of Civil Engineering, Lanzhou Jiaotong
University, Lanzhou 730070, China;
2.China Railway Eryuan Engineering Group Co. Ltd, Chengdu 610031, China |
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| Abstract: | In order to explore the influence of temperature
and sodium sulfate content on the salt-frost heave ratio and proportion
of salt heave in fine-grained sodium sulfate saline soil, Lanzhou loess
was taken as plain soil to prepare specimens mixed salt artificially for testing. The results showed that when the compaction
degree is 92% and the moisture content is the optimal moisture content of
16.8%, with the increase of the salt content, the freezing temperature of the
fine-grained saline soil decreases with the increase of the sodium sulfate
content, and with the decrease of the temperature, the change trend of salt heave ratio is basically
consistent with the salt-frost heave ratio. From freezing temperature to -5 ℃, the salt heave ratio is significant, and below -5 ℃ salt heave ratio less increases; when the compaction
degree is 92% and the moisture content is 16.8%, the lower the temperature is,
the larger the salt heave ratio will be when the
sodium sulfate content is constant. At constant temperature, the higher the
content of sodium sulfate, the more the salt heave ratio; above the freezing
temperature the salt heave ratio will be 100%; As the freezing temperature
drops to -3 - -4 ℃, the salt heave ratio will drop
to 50%, and salt heave ratio will be constant as the freezing temperature lower than -10 ℃. |
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| Keywords: | 5pt font-family:"color:black Lanzhou loess" target="_blank">">Lanzhou loess salt-frost heave fine-grained saline soil sodium sulfate content 5pt font-family:"color:black proportion of salt" target="_blank">">proportion of salt heave |
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