Experimental analysis of horizontal frost heaving force of loess in Lanzhou City of Gansu Province Area
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摘要:
为研究不同含水率黄土在一维冻结融化过程中温度场和水平冻胀力的变化特征规律，选取兰州地区黄土进行了封闭系统下的一维冻结融化试验。研究结果表明：土体的降温过程分为四个阶段，降温冻结初期各深度土体的温度下降速率较快；土体温度下降到0.4 ℃时降温曲线出现转折点，土层各深度降温速曲线出现近乎平行于横坐标的平稳段；冻结后期各深度土体的温度下降速率较慢。最大水平冻胀力沿着土体深度先是稳定变化较为小，然后增大到最大值最后减小。水平冻胀力最大值随含水率有很明显的变化，含水率越高水平冻胀力越大，而其他值的大小受含水率的影响较小，水平冻胀力最大值出现在相对深度0.6～0.8处。
Abstract:In order to study the variation of temperature field and horizontal frost heaving force during the one-dimensional freezing and melting process of loess with different water content, the one-dimensional freezing and melting test under closed system was carried out on the loess from Lanzhou Area. The results show that the cooling process of the soil can be divided into four stages. The temperature drop rate of the soil at each depth is faster when the temperature is frozen. When the temperature drops to 0.4 ℃, the cooling curve shows a turning point, and the depth of the soil decreases. A plateau that is nearly parallel to the abscissa; the temperature of the soil at each depth is slower at the late stage of freezing. The maximum horizontal frost heaving force changes little along the soil depth, then increases to the maximum and finally decreases. The maximum value of horizontal frost heaving force changes obviously with the water content. The higher the water content is, the greater the horizontal frost heaving force is, while the other values are less affected by the water content. The maximum value of horizontal frost heaving force appears at the relative depth of 0.6 to 0.8.
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Key words:
- horizontal frost heave force /
- model test /
- frozen soil /
- temperature field /
- frost heave
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表 1 黄土基本物理指标
Table 1. Basic physical properties of loess
比重
Gs液限
wL/%塑限
wp/%塑性指数
Ip最优含水率
wopc/%最大干密度
ρdmax/(g·cm−3)2.71 28.38 15.21 13.17 13.6 1.89 
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[1] 徐斅祖, 王家澄, 张立新. 冻土物理学[M]. 北京: 科学出版社, 2001.
XU Xuezu, WANG Jiacheng, ZHANG Lixin. Physics of frozen soils[M]. Beijing: Science Press, 2001. (in Chinese with English abstract)
[2] 童长江, 管枫年. 土的冻胀与建筑物冻害防治[M]. 北京: 水利水电出版社, 1985: 96−103.
TONG Changjiang, GUAN Fengnian. Prevention of frost heave of soil and freezing damage of buildings [M]. Beijing: Water Re-sources and Electric Power Press, 1985: 96−103. (in Chinese)
[3] EIGENBROD K D. Effects of cyclic freezing and thawing on volume changes and permeabilities of soft fine-gained soils[J]. Canadian Geotechnical Journal,1996,33(4):529 − 537. doi: 10.1139/t96-079-301
[4] 李岩, 刘波, 张建新. 竖向直排冻结条件水平冻胀力试验研究[J]. 岩土力学,2014,35(11):3199 − 3206. [LI Yan, LIU Bo, ZHANG Jianxin. Experimental research on horizontal frost heaving force of vertical straight freezing[J]. Rock and Soil Mechanics,2014,35(11):3199 − 3206. (in Chinese with English abstract)
[5] 刘鸿绪. 对土冻结过程中若干冻胀力学问题的商榷(续)[J]. 冰川冻土,1990,12(4):351 − 357. [LIU Hongxu. Discussion on some problems of frost-heaving mechanics in freezing process of soil[J]. Journal of Glaciology and Geocryology,1990,12(4):351 − 357. (in Chinese with English abstract)
[6] 刘鸿绪, 朱卫中, 朱广祥, 等. 再论冻胀量与冻胀力之关系[J]. 冰川冻土,2001,23(1):63 − 66. [LIU Hongxu, ZHU Weizhong, ZHU Guangxiang, et al. Research on the relationship of frost-heaving forces and amount of frost-heaving again[J]. Journal of Glaciology and Geocryology,2001,23(1):63 − 66. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-0240.2001.01.011
[7] 孙彦福, 刘秀英. 关于平行水平冻胀力问题的探讨[J]. 低温建筑技术,1999,21(4):37 − 38. [SUN Yanfu, LIU Xiuying. About parallel horizontal frost heaving force problem discussed in this paper[J]. Low Temperature Architecture Technology,1999,21(4):37 − 38. (in Chinese with English abstract)
[8] 姜龙, 王连俊, 张喜发, 等. 季冻区公路路基低液限黏土法向冻胀力试验[J]. 中国公路学报,2008,21(2):23 − 27. [JIANG Long, WANG Lianjun, ZHANG Xifa, et al. Experiment on normal frozen-heave force of low liquid-limit clay of highway roadbed in seasonal frost region[J]. China Journal of Highway and Transport,2008,21(2):23 − 27. (in Chinese with English abstract) doi: 10.3321/j.issn:1001-7372.2008.02.005
[9] 胡坤, 周国庆, 李晓俊, 等. 不同约束条件下土体冻胀规律[J]. 煤炭学报,2011,36(10):1653 − 1658. [HU Kun, ZHOU Guoqing, LI Xiaojun, et al. Experiments on frost heave of artificial frozen soils with different constraints[J]. Journal of China Coal Society,2011,36(10):1653 − 1658. (in Chinese with English abstract)
[10] 王建州, 刘书幸, 周国庆, 等. 深季节冻土地区基坑工程水平冻胀力试验研究[J]. 中国矿业大学学报,2018,47(4):815 − 821. [WANG Jianzhou, LIU Shuxing, ZHOU Guoqing, et al. Model experiment on frost-heave force of foundation pit at deepseasonal frozen regions[J]. Journal of China University of Mining & Technology,2018,47(4):815 − 821. (in Chinese with English abstract)
[11] 吕长霖. 一维冻结条件下土体冻胀与基础水平冻胀力试验研究[D]. 徐州: 中国矿业大学, 2018.
LYU Changlin. Experimental study on soil frost heave and horizontal frost heave force of foundation under one-dimensional freezing condition [D]. Xuzhou: China University of Mining and Technology, 2018. (in Chinese)
[12] VINSON T S, CHAICHANAVONG T, CZAJKOWSKI R L. Behavior offrozen clays under cyclic axial loading[J]. Journal of the Geotechnical Engineering Division,1978,104(GT7):779 − 800.
[13] LING X Z, ZHANG F, LI Q L, et al. Dynamic shear modulus and damping ratio of frozen compacted sand subjected to freeze–thaw cycle under multi-stage cyclic loading[J]. Soil Dynamics and Earthquake Engineering,2015,76:111 − 121. doi: 10.1016/j.soildyn.2015.02.007
[14] 中华人民共和国铁道部. 铁路工程土工试验规程: TB 10102—2010[S]. 北京: 中国铁道出版社, 2010.
Ministry of Railways of the People's Republic of China. Code for Soil Test of Railway Engineering: TB 10102—2010[S]. Beijing: China Railway Publishing House, 2010. (in Chinese)
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