基于混合量热原理的冻土比热容测试方法

李顺群; 王杏杏; 夏锦红; 申道明

doi:10.11779/CJGE201809015

基于混合量热原理的冻土比热容测试方法 English Version

李顺群^{1, 2, ,},
王杏杏^{1, 2},
夏锦红³,
申道明³

1. 天津城建大学土木工程学院,天津 300384;
2. 天津市软土特性与工程环境重点实验室,天津 300384;
3. 新乡学院土木工程与建筑系,河南新乡 453003

基金项目: 国家自然科学基金项目（41472253）; 天津市自然科学基金重点项目（16JCZDJC39000）; 天津市建设系统科学技术项目发展计划项目（2016-25）; 天津市建设工程技术研究所2017年财政资金项目（JGY18-01）

详细信息

作者简介:
李顺群(1971- ),男,博士,博士后,教授,从事土力学和基础工程方面的教学和研究工作。E-mail: lishunqun@sina.com。

通讯作者:
李顺群，E-mail：lishunqun@sina.com

中图分类号: TU411.3
计量
- 文章访问数: 405
- HTML全文浏览量: 5
- PDF下载量: 161
出版历程
- 收稿日期: 2017-03-31
- 发布日期: 2018-09-24

Test methods for specific heat capacity of frozen soil based on principles of mixing calorimetry

1. School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;
2. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China;
3. Department of Civil Engineering and Architecture, Xinxiang University, Xinxiang 453003, China

摘要

摘要: 土的比热容是冻结法施工中的重要参数,但既有混合量热法得到比热容是某一负温到平衡正温这一阶段的平均比热容而不是该负温点的比热容。根据黏土在冻结过程中孔隙水的相变随负温增加逐渐发生的客观事实,基于传统混合量热法建立了冻土比热容的递推算法。首先,待测试冻土试样分别由某一负温的左右两个微小增量开始,经混合量热法各个步骤后到达热平衡状态。则由负温开始至热平衡状态,试样吸收的热量Q,必然等于负温至0℃和0℃至平衡温度这两个阶段热量交换Q₁和Q₂的代数和。由于不存在相变,试样从0℃至热交换平衡温度需要的热量可以由常规的混合量热法获得。因此,试样由负温开始至0℃的热量可以通过两者相减得到,并可进一步得到试样由该负温左侧增量升温至该负温右侧增量需要的热量。最终,试样在该负温点的比热容可以根据比热容的定义得到。本文建立的冻土比热容递推算法能得到某温度点的比热容而非某温度段的平均比热容,且包含了潜热的贡献,因而更为合理有效。
- 比热容 /
- 未冻水含量 /
- 混合量热原理 /
- 潜热 /
- 递推方法
Abstract: The specific heat capacity of soil is an important parameter in the ground freezing method. However, the specific heat capacity obtained by the exiting mixed calorimetric methods is the average specific heat capacity from a negative temperature to the equilibrium positive temperature rather than that at the negative temperature. According to the fact that the phase transition of pore water occurs gradually with temperature change in freezing process, a recursive formula to the specific heat capacity of obtain frozen soil is established based on the exiting mixing calorimetry methods. First of all, two small equal temperature increments, a negative and a positive, are set for the negative temperature of the frozen soil. Then, two samples are prepared respectively at the two temperatures and the mixing calorimetry method is performed in order to arrive at each thermal equilibrium state. From the negative temperature state to the thermal equilibrium one, the heat absorbed by the sample, Q, will be equal to the total aequum of the two stages, Q₁ for negative temperature to 0℃ and Q₂ for 0℃ to equilibrium temperature. Since there is no phase change and latent heat, the heat required by the sample from 0℃ to the equilibrium temperature can be obtained by the conventional mixing calorimetry. Therefore, the required heat for the sample from negative temperature to 0℃ can be obtained by subtracting Q₂ from Q. And Further more, the required heat can be obtained for the given temperature from the negative increment to the positive increment. Finally, the specific heat capacity of the sample at the negative temperature can be obtained according to the definition of the specific heat capacity. From the proposed method, the capacity at any temperature, other than an average over a temperature range, can be calculated. And the proposed method can take latent heat into account. Therefore, it is more reasonable and effective.
- specific heat capacity /
- unfrozen water content /
- principle of mixing calorimetry /
- latent heat /
- recursive formula

HTML全文

参考文献(13)

[1]	齐吉琳, 马巍. 冻土的力学性质及研究现状[J]. 岩土力学, 2010, 31(1): 133-143. (QI Ji-lin, MA Wei.State-of-art of research on mechanical properties of frozen soils[J]. Rock and Soil Mechanics, 2010, 31(1): 133-143. (in Chinese))
[2]	孙振华. 多年冻土原状样热学性质研究[D]. 长春: 吉林大学, 2008. (SUN Zhen-hua.Research on the thermal character of undisturbed permafrost sample[D]. Changchun: Jinlin University, 2008. (in Chinese))
[3]	刘世伟, 张建明. 高温冻土物理力学特性研究现状[J]. 冰川冻土, 2012, 34(1): 120-129. (LIU Shi-wei, ZHANG Jian-ming.Review on physic-mechanical properties of warm frozen soil[J]. Journal of Glaciology and Geocryology, 2012, 34(1): 120-129. (in Chinese))
[4]	ABU-HAMDEH N H. Thermal properties of soils as affected by density and water content[J]. Biosystems Engineering, 2003, 86(1): 97-102.
[5]	RANKINEN K, KARVONEN T, BUTTERFIELD D.A simple model for predicting soil temperature in snow-covered and seasonally frozen soil: model description and testing[J]. Hydrology and Earth System Sciences, 2004, 8(4): 706-716.
[6]	OCHSNER T E, HORTON R, REN T.A new perspective on soil thermal properties[J]. Soil Science Society of America Journal, 2001, 65: 1641-1647.
[7]	徐学祖, 王家澄, 张立新. 冻土物理学[M]. 北京: 科学出版社, 2001. (XU Xue-zu, WANG Jia-cheng, ZHANG Li-xin.Physics of frozen soil[M]. Beijing: Science Press, 2010. (in Chinese))
[8]	赵小明, 赵冠春. 绝热量热法测量比热容容的实验研究[J]. 西安交通大学学报, 1995, 29(5): 12-17. (ZHAO Xiao-ming, ZHAO Guan-chun.Experimental study for specific heat capacity with adiabatic calorimetry[J]. Journal of Xi An Jiaotong University, 1995, 29(5): 12-17. (in Chinese))
[9]	苏天明, 刘彤, 李晓昭, 等. 南京地区土体热物理性质测试与分析[J]. 岩石力学与工程学报, 2006, 25(6): 1278-1283. (SU Tian-ming, LIU Tong, LI Xiao-zhao, et al.Test and analysis of thermal properties of soil in Nanjing district[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(6): 1278-1283. (in Chinese))
[10]	王补宣, 江亿. 利用热探针在现场同时测定松散介质α和λ的“加热-冷却法”[J]. 工程热物理学报, 1985, 6(3): 49-54. (WANG Bu-xuan, JIANG Yi.The “heating-cooling method” for measuring thermal diffusivity and conductivity of dispersed medium in the scene with a probe[J]. Journal of Engineering Thermophysics, 1985, 6(3): 49-54. (in Chinese))
[11]	刘宏伟, 张喜发, 冷毅飞. 大兴安岭多年冻土骨架比热容测定及经验值[J]. 低温建筑技术, 2009, 31(8): 96-97. (LIU Hong-wei, ZHANG Xi-fa, LENG Yi-fei.Determination and empirical value on specific heat of permafrost skeleton in Da Hinggan Mountains[J]. Low Temperature Architecture Technology, 2009, 31(8): 96-97. (in Chinese))
[12]	王丽霞, 胡庆立, 凌贤长, 等. 青藏铁路冻土未冻水含量与热参数试验[J]. 哈尔滨工业大学学报, 2007, 39(10): 1660-1663. (WANG Li-xia, HU Qing-li, LING Xian-chang, et al.Test study on unfrozen water content and thermal parameters of Qinghai-Tibet railway frozen silty clay[J]. Journal of Harbin Institute of Technology, 2007, 39(10): 1660-1663. (in Chinese))
[13]	冷毅飞, 张喜发, 杨凤学, 等. 冻土未冻水含量的量热法试验研究[J]. 岩土力学, 2010, 31(12): 3758-3764. (LENG Yi-fei, ZHANG Xi-fa, YANG Feng-xue, et al.Experimental research on unfrozen water content of frozen soils by calorimetry[J]. Rock and Soil Mechanics, 2010, 31(12): 3758-3764. (in Chinese))

施引文献(9)

期刊类型引用(2)

1.	张翻，李顺群，夏锦红，刘烨璇，高凌霞，刘双菊. 基于热参数和土水势变化的冻土冻结势研究. 工业建筑. 2019(07): 97-101+82 . 百度学术
2.	刘巍，张进鹏，刘立民，张付涛，毛怀昆. 袁大滩煤矿风化岩土体冻结热参数及单轴压缩试验研究. 山东科技大学学报(自然科学版). 2019(05): 31-38 . 百度学术