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| 1 | Study of polluted soil remediation based on freezing and thawing cycles显示文摘It is generally known that soil pollution poses a terrible hazard to the environment, but the present techniques of contaminated soil remediation cannot control this growing threat. This paper compares the pollutant extraction efficiency of traditional pumping and treating, which is a typical washing technology for the remediation of contaminated soils, with methods that utilize freeze-thaw cycles. In the soil freezing process, water shifts from unfrozen soils to the freezing front, and the permeability of soil will be enhanced under certain temperature gradients and water conditions. Therefore, this paper discusses the purification of contaminated soil through freeze-thaw action. We conducted a cleansing experiment on clay and silica sand infused with NaCl(simulation of heavy metals) and found that the efficiency of purification was enhanced remarkably in the latter by the freeze-thaw action. To assess the effective extraction of DNAPLs in soil, we conducted an experiment on suction by freezing, predicated on the different freezing points of moisture and pollutants. We found that the permeability coefficient was significantly increased by the freezing-thawing action, enabling the DNAPL contaminants to be extracted selectively and effectively. | DaHu Rui BaiYang Song Yuzuru Ito Li Wang | 2014 | Research in Cold and Arid Regions2014，6，4： | 3 |
| 2 | Analysis on stability of reinforced soil at shield departure area 显示文摘 | RUI Dahu WANG Yang ZHANG Changhai | 2012 | Applied Mechanics and Materials2012，，： | 1 |
| 3 | The analysis of heat and water fluxes in frozen silty soil显示文摘In this paper, based on the basic equations of water flow and heat transfer, the hydrothermal coupling model is established.The numerical model was realized in COMSOL Multiphysics software, and simulation results are compared with the experimental results of Watanabe and Wake(2008) to verify the effectiveness of the model. Through the calculation, we can obtain the dynamic changes of heat and water fluxes, thermal and hydrological properties, matric potential and temperature gradient in unsaturated freezing soil; and these variables are unmeasurable in practice. | DaHu Rui Ming Lu Kunio Watanabe Jun Zhang | 2019 | Research in Cold and Arid Regions2019，11，1： | 0 |
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