Taking the 2 types red clay in Guangxi area as the research object, through the isothermal adsorption test, the type and content of the adsorbed bound water in the red clay were determined, and the nature of the difference in the amount of adsorbed bound water in the two red clays was explained from the microscopic perspective by the mercury-pressure test. Based on this, the thermal conductivity of two kinds of red clay samples under different water contents was measured by the thermal probe method, and the influence of bound water content on the thermal conductivity of red day was discussed. The results showed that the total amount of adsorbed bound water in Guilin red clay and Liuzhou red clay was 22.417% and 10.957%, respectively, and the former one was about twice as much as the latter one, mainly due to the difference in mineral composition of the two red clays. The red clay in Guilin has a higher content of small pores compared to that in Liuzhou, resulting in a higher porosity and greater specific surface area, which endows it with a stronger capacity to adsorb and bind water. The thermal conductivity of the two red clays increased with the increase of the bound water content. The effect of bound water content on thermal conductivity can be attributed to both the bound water film and the "liquid bridge" effect in the soil.
Yang Chenglin
,
Zeng Zhaotian
,
Cao Shanshan
,
Che Dongze
,
Tang Shuanghui
. Effect of Bound Water Content in Red Clay on Its Thermal Conductivity[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(1)
: 118
-122
.
DOI: 10.20174/j.JUSE.2025.01.13
[1] 谭罗荣, 孔令伟. 某类红粘土的基本特性与微观结构模型[J]. 岩土工程学报, 2001, 23(4): 458-462. (Tan Luorong, Kong Lingwei. Fundamental property and microstructure model of red clay[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(4): 458-462. (in Chinese))
[2] 李婕, 马富丽. 压实黄土导热系数的试验研究[J]. 科学技术与工程, 2015, 15(17): 218-221. (Li Jie, Ma Fuli. Experimental study on the thermal conductivity of compacted loess[J]. Science Technology and Engineering, 2015, 15(17): 218-221. (in Chinese))
[3] 陈波, 张芬, 马慧龙. 土体热导率的研究现状及展望 [J]. 土工基础, 2019, 33(5): 575-578. (Chen Bo, Zhang Fen, Ma Huilong. State of the art review soil thermal conductivity studies[J]. Soil Engineering and Foundation, 2019, 33(5): 575-578. (in Chinese))
[4] 尹凤玲, 张怀, 石耀霖.华北地区水位下降是否会减缓气温上升—浅部地温影响的数值模拟分析 [J]. 地球物理学报, 2015, 58(10): 3649-3659. (Yin Fengling, Zhang Huai, Shi Yaolin. Whether water level decline will slow down temperature rise in North China:Numerical simulation analysis of the influence of shallow ground temperature[J]. Chinese Journal of Geophysics, 2015, 58(10): 3649-3659. (in Chinese))
[5] 于明志, 彭晓峰, 方肇洪, 等. 沙土孔隙内水分形态及分布[J]. 山东建筑大学学报, 2007, 22(6):526-530. (Yu Mingzhi, Peng Xiaofeng, Fang Zhaohong, et al. Water morphology and distribution in pores of sandy soil[J]. Journal of Shandong Jianzhu University, 2007, 22(6): 526-530. (in Chinese))
[6] Sun Q, Lyu C. Semiempirical correlation between thermal conductivity and electrical resistivity for silt and silty clay soils[J]. Geophysics, 2019, 84(3):1-31.
[7] Rees S W, Adjali M H, Zhou Z, et al. Ground heat transfer effects on the thermal performance of earth-contact structures[J]. Renewable ＆ Sustainable Energy Reviews, 2000, 4(3): 213-265.
[8] 张飞.含水率和低温对黄土热物理参数影响性研究[J]. 铁道工程学报, 2019, 36(11): 57-61. (Zhang Fei. Research on the influence of water content and low temperature on the thermal physical parameters of loess[J]. Journal of Railway Engineering Society, 2019, 36(11): 57-61. (in Chinese))
[9] 曾召田, 范理云, 莫红艳, 等. 土壤热导率的影响因素试验研究[J]. 太阳能学报, 2018, 39(2): 377-384. (Zeng Zhaotian, Fan Liyun, Mo Hongyan, et al. Experimental research on the influencing factors of soil thermal conductivity[J]. Acta Energiae Solaris Sinica, 2018, 39(2): 377-384. (in Chinese))
[10] Li J, Li X F, Wu K L, et al. Thickness and stability of water film confined inside nanoslits and nanocapillaries of shale and clayey[J]. International Journal of Coal Geology, 2017, 179: 253-268.
[11] 吴昱东. 含水率对红黏土物理力学性质的影响及微观机制研究[D].桂林:桂林理工大学, 2019. (Wu Yudong. Study on the effect of water content on the physical and mechanical properties of red clay and the microscopic mechanism [D]. Guilin: Guilin University of Technology, 2019. (in Chinese))
[12] 王平全. 用等温吸附法确定黏土表面吸附结合水界限[J]. 西南石油学院学报, 2005, 27(6): 57-61, 102-103. (Wang Pingquan. Determination of bound water boundary on clay surface by isothermal adsorption[J]. Journal of Southwest Petroleum Institute, 2005, 27(6): 57-61, 102-103. (in Chinese))
[13] 刘代俊, 马克承, 石炎福. 盐饱和溶液气相的相对湿度[J]. 成都科技大学学报, 1991, 58(4): 99-102. (Liu Daijun, Ma Kecheng, Shi Yanfu. Relative humidities about saturated solutions of different kinds of salt[J]. Journal of Chengdu University of Science and Technology, 1991, 58(4): 99-102. (in Chinese))
[14] 王铁行, 李彦龙, 苏立君. 黄土表面吸附结合水的类型和界限划分[J]. 岩土工程学报, 2014, 36(5):942-948. (Wang Tiexing, Li Yanlong, Su Lijun. Types and boundaries of bound water on loess particle surface[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(5): 942-948. (in Chinese))
[15] 梁维云, 韦昌富, 颜荣涛. NaCl溶液饱和膨胀土的压缩特性及其微观机制研究[J]. 岩土力学, 2019, 40(12): 4759-4766. (Liang Weiyun, Wei Changfu, Yan Rongtao. Compression characteristics of swelling soils saturated with NaCl solution and its microscopic mechanism[J]. Rock and Soil Mechanics, 2019, 40(12): 4759-4766. (in Chinese))
[16] Lloret A, Villar M V. Advances on the knowledge of the thermo-hydro-mechanical behavior of heavily compacted "FEBEX" bentonite[J]. Physics and Chemistry of the Earth, 2007, 32: 701-715.
[17] 徐新川. 天津滨海新区软土的微观结构特征和结合水特性研究[D].长春:吉林大学,2016. (Xu Xinchuan. Study on microstructural characteristics and binding water properties of soft soils in Tianjin Binhai New Area[D]. Changchun: Jilin University, 2016. (in Chinese))
[18] 徐云山, 孙德安, 曾召田, 等. 膨润土热传导性能时效性试验研究[J], 岩土力学, 2019, 40(11):4324-4330.(Xu Yunshan,Sun De'an,Zeng Zhaotian,et al.Experimental study on aging effect on bentonite thermal conductivity[J]. Rock and Soil Mechanlcs, 2019, 40(11):4324-4330. (in Chinese))
