Abstract：Based on ground temperature record of one year at Beiluhe section of Qinghai-Tibet Railway，where field testing embankment was constructed，the engineering effect of duct-ventilation embankment is discussed. Testing results indicate that duct-ventilation embankment is available to protect the underlying permafrost and can even extend it. It is also shown that it is better to apply large-diameter ducts and to bury ducts near the initial ground surface，so that the engineering effect of ventilation embankment can be enhanced.
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