DYNAMIC OBSERVATION AND ANALYSIS OF MOISTURE MIGRATION FOR WIND-BLOW SAND IN OPEN SYSTEM DURING FROST
MAO Xuesong1，HOU Zhongjie1，KONG Lingkun2
(1. Key Laboratory for Special Area Highway Engineering，Ministry of Education，Chang¢an University，Xi¢an， Shaanxi 710064，China；2. Highway Construction Group of Shandong Province，Jinan，Shandong 250012，China)
Abstract：To discover the motive power of moisture migration of the wind-blow sand during frost，the experiments are carried out on the soil samples with moisture balance by supplying water from bottom under constant temperature. Then the temperature gradient is applied to the soil samples，and the changes of both temperature and water content of the samples are dynamically observed. The flow-in flux model is revised by the experimental results. The study shows that both the matric potential and gravity potential are main motive powers of the moisture migration of the wind-blow sand under constant temperature. The moisture migration can be completed in short time. The rate of water supplying decays quickly with time increasing. According to the frost velocity and the frost depth，the soil samples can be divided into three sections，i.e.，quick frost section，transition frost section，and stable frost section under gradient temperature. During frost，the flow-in flux of the samples increases with the decrease of the frost rate. The predicted values achieved from the revised flow-in flux model agree well with field test results. After the wind-blow sand with water supplying is frosted under constant temperature，the water supplied from the bottom of the sample all flows into the frost section. So it can be concluded that the motive power of moisture migration comes from the temperature gradient during frost.
毛雪松，侯仲杰，孔令坤. 冻结条件下开放体系风积砂水分迁移的动态观测及分析[J]. 岩石力学与工程学报, 2010, 29(01): 202-208.
MAO Xuesong1，HOU Zhongjie1，KONG Lingkun2. DYNAMIC OBSERVATION AND ANALYSIS OF MOISTURE MIGRATION FOR WIND-BLOW SAND IN OPEN SYSTEM DURING FROST. , 2010, 29(01): 202-208.
