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Advances in Earth Science >

2014 , Vol. 29 >Issue 3: 380 - 387

DOI: https://doi.org/10.11867/j.issn.1001-8166.2014.03.0380

Orginal Article

Effects of Sunshine-shield of Qinghai-Tibet Railway Land Bridge on the Solar Radiation of Underbridge and Surrounding Permafrost

  • Lijiang Xia ,
  • Guoqing Zhou ,
  • Yuyi Liu ,
  • Tao Wang ,
  • Qixiang Yin
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  • 1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221008, China
    2. School of Food Engineering, Ludong University, Yantai 264025, China
    3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China

Received date: 2013-12-07

  Revised date: 2014-02-21

  Online published: 2014-03-10

Copyright

地球科学进展 编辑部, 2014, This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.本文支持CCAL协议的开放获取，允许读者在以下情况下免费获取和使用本文内容：科研、教学、数据库索引，并标明出处。但不得用于任何商业目的。版权属于地球科学进展 编辑部
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Abstract

Based on the change law of solar radiation intensity and shadow of land bridge variation with time, the mathematical model expressing of the relationship among time, solar radiation intensity,solar position and shadow track was established. The effects of the sunshine-shield of land bridge floor were studied using the model. Direct rate concept was proposed to define the proportion of solar direct radiation energy of the surrounding permafrost. The results show that height, direction and width of land bridge are the major influence factors on the solar radiation of underbridge and surrounding permafrost. With the increase of the height, shading scope and direct rate of sunshade center also increase; with the increase of the width, direct rate of the surrounding permafrost decrease; there was obvious asymmetry distribution of permafrost surface direct rate, especially for the east-west bridge. Sunshine-shield of land bridge can effectively reduce the sun radiation heat of the surrounding permafrost and also cause non-uniform distribution of solar radiation on permafrost surface around piles, which should be concerned in the stability estimation of land bridge.

Key words： Permafrost; Sunshine-shield; Land bridge.

Cite this article

Lijiang Xia , Guoqing Zhou , Yuyi Liu , Tao Wang , Qixiang Yin . Effects of Sunshine-shield of Qinghai-Tibet Railway Land Bridge on the Solar Radiation of Underbridge and Surrounding Permafrost[J]. Advances in Earth Science, 2014 , 29(3) : 380 -387 . DOI: 10.11867/j.issn.1001-8166.2014.03.0380

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