作者：杨高升1, 姚晓亮2,3, 周攀峰4, 耿永明1, 张泽2,3
作者单位：1. 兰州大学土木工程与力学学院, 甘肃 兰州 730000;
2. 中国科学院西北生态环境资源研究所 冻土工程国家重点实验室, 甘肃 兰州 730000;
3. 亚洲寒区环境与工程国际研究中心, 甘肃 兰州 730000;
4. 核工业广州工程勘察院, 广东 广州 510800
关键词：低温恒温箱;温度均匀性;导流板;低温恒温试验
摘要：
冻土低温恒温箱内的温度均匀性对试验精度至关重要。为改善冻土试验低温恒温箱的温度均匀性，该文对放置试样情况下的低温恒温箱进行设有不同形式导流板的多组试验，分析试验结果表明：在低温恒温箱内放置试样会对箱内温度均匀性产生较大影响，具体表现为上热下冷、前热后冷；而在低温恒温箱内设置温度导流板可以有效提升箱内温度均匀性。通过对比分析不同形式导流板对箱体内气流流向的影响，得到一种能够强制箱体内气流在试样周围均匀分布的导流板形式。试验结果显示：该导流板能够将不同温度监测点温度差异控制在温度均值的0.2 ℃以内，能够满足冻土试验的温度均匀性要求。
Experimental study on temperature uniformity of low temperature incubator in frozen soil test
YANG Gaosheng1, YAO Xiaoliang2,3, ZHOU Panfeng4, GENG Yongming1, ZHANG Ze2,3
1. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
2. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Enviroment and Resources, CAS, Lanzhou 730000, China;
3. International Research Center for Asia Cold-regions Environment and Engineering, Lanzhou 730000, China;
4. Guangzhou Academy of Nuclear Engineering Investigation, Guangzhou 510800, China
Abstract: Temperature uniformity in low temperature incubator(LTI) is significant for the testing precision of frozen soils. To improve the temperature uniformity of LTI for the frozen soil test, several groups of experiments on LTI with specimen with different guide vanes forms were conducted. The experiment results show that temperature uniformity is greatly influenced by the specimen in the LTI, i.e., temperature on the specimen top and front is higher than that of bottom and back side. After setting guide vanes in LTI, the temperature uniformity was improved greatly. By analyzing the influence of different forms of guide vanes on airflow direction, this paper obtained an optimized form of guide vanes which forces the airflow distributing uniformly surround the specimen. The test results show that the guide vanes can control the temperature difference at different temperature monitoring points within ±0.2℃ of average temperature, and which fulfills the temperature requirements of frozen soil tests.
Keywords: low temperature incubator;temperature uniformity;guide vanes;low-constant temperature test
2017, 43(9): 134-138 收稿日期: 2017-05-28;收到修改稿日期: 2017-07-03
基金项目: 国家自然科学基金（41671061）
作者简介: 杨高升(1991-),男,山西朔州市人,硕士研究生,专业方向为寒区岩土工程。
参考文献
[1] ZHANG L, MA W, YANG C, et al. Investigation of the pore water pressures of coarse-grained sandy soil during open-system step-freezing and thawing tests[J]. Engineering Geology,2014,181:233-248.
[2] AKAGAWA S, HIASA S, KANIE S, et al. Pore water and effective pressure in the frozen fringe during soil freezing[C]//Permafrosts of the 9th international conference on permafrost. Fairbanks Alaska USA:University of Alaska Fairbanks,2008:13-18.
[3] 刘世伟,张建明,张虎,等. 高温冻土中孔隙水压力量测初探[J]. 甘肃农大学报,2011,46(6):155-160.
[4] 马小杰,张建明,常小晓,等. 高温-高含冰量冻土蠕变试验研究[J]. 岩土工程学报,2007,29(6):848-852.
[5] 苏凯,张建明,刘世伟,等. 高温-高含冰量冻土压缩变形特性研究[J]. 冰川冻土,2013,35(2):3063-3069.
[6] ZHANG H, ZHANG J, ZHANG Z, et al. Investigation of the pore-water pressure of saturated warm frozen soils under a constant load[J]. Journal of Offshore Mechanics & Arctic Engineering,2016,138(6):1-6.
[7] 李海鹏,林传年,张俊兵,等. 饱和冻结黏土在常应变率下的单轴抗压强度[J]. 岩土工程学报,2004,26(1):105-109.
[8] 马小杰,张建明,常小晓,等. 高温-高含冰量冻结黏土强度试验研究[J]. 岩土力学,2008,29(9):2498-2502.
[9] 李洪升,杨海天,常成,等. 冻土抗压强度对应变速率敏感性分析[J]. 冰川冻土,1995,17(1):40-48.
[10] 赵淑萍,何平,朱元林,等. 冻结粉土的动静蠕变特征比较[J]. 岩土工程学报,2006,28(12):2160-2163.
[11] 刘增利,李洪升,朱元林,等. 冻土单轴压缩动态试验研究[J]. 岩土力学,2002,23(1):12-16.
[12] 杜子峥,谢晶,朱进林. 低温恒温箱的非稳态数值模拟及验证[J]. 食品与机械,2014(5):126-132.
