积沙对铁路道碴层反射率的影响研究

doi:10.7522/j.issn.1000-0240.2016.0187

冰川冻土 ›› 2016, Vol. 38 ›› Issue (6): 1598-1606.doi: 10.7522/j.issn.1000-0240.2016.0187

积沙对铁路道碴层反射率的影响研究

吴志强^1,2, 张明义¹, 游志浪^1,2, 王继伟^1,2

1. 中国科学院西北生态环境资源研究院冻土工程国家重点实验室, 甘肃兰州 730000;
2. 中国科学院大学, 北京 100049

收稿日期:2016-08-03 修回日期:2016-11-17 出版日期:2016-12-25 发布日期:2017-04-06
通讯作者: 张明义,E-mail:myzhang@lzb.ac.cn E-mail:myzhang@lzb.ac.cn
作者简介:吴志强(1989-),男,江西鄱阳人,2014年毕业于江西理工大学,现为中国科学院西北生态环境资源研究院在读硕士研究生,主要从事冻土与寒区工程方面的研究.E-mail:zhiqwu@163.com
基金资助:
国家自然科学基金项目（41471063）；中国科学院“百人计划”项目（张明义博士）；冻土工程国家重点实验室课题（SKLFSE-ZT-23）；中国科学院STS项目（HHS-TSS-STS-1502）；中国科学院西部行动计划项目（KZCX2-XB3-19）；中国科学院青年创新促进会项目（2012300，张明义博士）资助

Study of the effect of sand cover on the albedo of railway ballast layer

WU Zhiqiang^1,2, ZHANG Mingyi¹, YOU Zhilang^1,2, WANG Jiwei^1,2

1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-08-03 Revised:2016-11-17 Online:2016-12-25 Published:2017-04-06

摘要/Abstract

摘要：

青藏铁路建成后，随着全球气温的升高及人类活动的影响，青藏高原地表沙化正在呈现加速发展的趋势，地表积沙入侵路基，填堵和覆盖青藏铁路道碴层，影响了青藏铁路道碴层的反射率。为此开展了积沙对于铁路道碴层反射率影响的研究。为此本文将测量碎石层等粗糙表面的反射率的方法进行了改进，使其适用于测量混有流动性材料（如积沙等）的粗糙表面（如铁路道碴层等）的反射率。结果表明：随着铁路道碴层模型积沙覆盖率的增大，铁路道碴层的反射率先减小后增大，当积沙完全覆盖道碴层时，其反射率达到最大。并将该测试方法与ASTM-E1918A标准测试方法进行对比分析发现，在天气晴朗、无云、无雾霾且太阳辐射入射量瞬时强度变化<20W·m^-2时，两种测试方法计算非常接近，其测量差值0~0.002，综合分析认为在测量带有流动材料的反射率时，采用本测试方法方便可靠。但积沙对道碴层的热流平衡影响有待进一步研究。

关键词: 反射率, 太阳辐射, 积沙覆盖率, 铁路道碴层

Abstract:

After the construction of the Qinghai-Tibet Railway, with the influence of global warming and human activities, the desertification is accelerated on the Tibet Plateau, Because of the invasion of sand, some ballast layers are filled and covered along the railway, and thus the albedo of the ballast layers are changed. Therefore, the effect of sand cover on the albedo of the railway ballast layer are studied in this paper. The results showed that with the increase of the sand cover ratio, the albedo of the railway ballast layer model first decreases, then increases. When the railway ballast layer was completely covered by sand, its albedo reached the maximum. By comparing the used method and the ASTM-E1918A method, it is found that when the variation of solar intensity is less than 20 W·m^-2 in sunny days with no clouds and no haze, the results from the used method are very close to those from the ASTM-E1918A method, with a differences of about 0~0.002. Based on comprehensive analysis it is believed that used method is more convenient and reliable in measuring the albedo of unstable materials. However, the effect of sand cove on the heat balance of ballast layers still needs further to be study.

Key words: albedo, solar radiation, sand cover, railway ballast layer

中图分类号:

U418.5+6

吴志强, 张明义, 游志浪, 王继伟. 积沙对铁路道碴层反射率的影响研究[J]. 冰川冻土, 2016, 38(6): 1598-1606.

WU Zhiqiang, ZHANG Mingyi, YOU Zhilang, WANG Jiwei. Study of the effect of sand cover on the albedo of railway ballast layer[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2016, 38(6): 1598-1606.

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积沙对铁路道碴层反射率的影响研究

Study of the effect of sand cover on the albedo of railway ballast layer

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