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| EXPERIMENTAL STUDY OF FREEZE CHARACTERISTICS IN ROADBED- CULVERT TRANSITION SECTION ALONG A HIGH-SPEED RAILWAY |
| NIU Fujun1，2，LIU Hua1，3，NIU Yonghong1 |
(1. State Key Laboratory of Frozen Soil Engineering，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China；2. Cold Regions Road Engineering Laboratory，CCCC
First Highway Consultants Co.，Ltd.，Xi?an，Shaanxi 710068，China；3. School of Civil Engineering，Xi'an University
of Architecture and Technology，Xi?an，Shaanxi 710055，China) |
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Abstract Based on monitoring of ground temperature in a typical roadbed-culvert transition section，the ground temperature regime and its temporal and spatial development，along with its impact on roadbed stability was analyzed. The results show that，the maximum depth of seasonal freezing in the roadbed of transaction is about 2 times which in the natural ground because of the existence of culvert. The starting times of freezing and thawing process above and below the culvert are earlier than that behind the culvert wall. As the culvert performs somewhat as a ventilation duct，the temperature difference caused by the sunny-shady slopes is weaken. The culvert has a significant impact on the ground temperature of the roadbed around it，showing as significant increase of temperature changing amplitude in the fillings above the culvert and behind the culvert wall. Above all，the works of monitoring and analysis of the freezing characteristics in roadbed-culvert transition section can provide references for the selection of roadbed filling material and foundation treatment below the culvert.
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Received: 06 May 2013
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2014, Vol. 33 
