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《Journal of Glaciolgy and Geocryology》 2002-05
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Application of Thermal\|insulation Treatment to Roadway Engineering in Permafrost Regions

SHENG Yu~ 1,\ ZHANG Lu\|xin~ 2,\ YANG Cheng\|song~ 1,\ FANG Jian\|hong~ 3 (1.State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China; 2.Resources and Environment School, Lanzhou University, Lanzhou Gansu 730000, C  
The principles of protecting permafrost with thermal\|insulating treatment are discussed in this. It is considered that the main effect of thermal\|insulation material is to decrease the annual changing range of ground temperature below the material. A test of thermal\|insulation treatment is performed in a section of the Qinghai-Tibetan highway, which is located around the pass of the Kunlun Mountains. The observed data of ground temperature under the roadbed, shoulders of the road and natural ground surface shows that the insulating treatment cannot change the endothermic trend due to the building of the highway, but can decrease both temperatures and annual temperature changing range in shallow ground. The permafrost table under the insulation\|treated roadbed is higher than that of non\|insulation sections. The decrease in annual temperature changing range shows a much great effect of thermal\|insulation, the dominant function of the thermal\|insulation treatment. In another test section, which is located in Beiluhe region of the Qinghai-Tibetan Railway under building, the observed data show a great temperature difference between the upper and bottom of insulation material. Thermal\|insulation effect is being sufficiently performed. It is expected that thermal\|insulation treatment greatly decrease the annual changing range of ground temperature and protect permafrost from thawing or delay the thawing trend.
【Fund】: 中国科学院知识创新工程重大项目 (KZCX1 SW 0 4);; 中国科学院“西部之光”项目;; 中国科学院寒区旱区环境与工程研究所知识创新工程项目 (CACX2 10 0 71)资助
【CateGory Index】: U419.92
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