Analysis of the Moisture-heat Transfer Law and Numerical Simulation during Soft Rock Mass Freezing-thawing Process
|School||Xi'an University of Science and Technology|
|Keywords||Soft rock Freeze-thaw Water and heat transfer Numerical Simulation|
Cold regions geotechnical field coupling problem has been a research focus of many scholars , especially with the implementation of the western development . In this paper, the scholars take theoretical research in this field of study on the basis of experimental analysis and numerical simulation method for the study of the migration of hydrothermal soft rock freezing and thawing process . Since most of the soft rock engineering in porosity fractured coexist, and the condition of water mostly when is saturated - unsaturated , this paper presents a double porous media saturated - unsaturated hydrothermal coupling model proposed coupling direction view , this experimental analysis has also been verified . The article also summarizes some of the important parameters of the coupling strength of the coupling field quantitative research , and provides a reference for future experimental study . This paper attempts to soft - rock -like materials - cement mortar freezing and thawing water thermal coupling experimental results show that : the temperature gradient significantly influenced the field distribution of the water , is the main driving force for moisture migration ; quartz mineral and soft rock content the higher the temperature field re uniform the longer ; higher the porosity , moisture content is greater the longer the freezing process - dual porosity coupled model matrix pore fluid storage space , which lengthened the freeze time . The end of this article application Femlab numerical simulation of soft rock tunnel surrounding rock temperature field and moisture field coupling , draw a large the water field on the temperature field , the the freeze circle will considering the moisture field surrounding rock thinning , and along with seepage the coefficient increases the freeze the circle also been thinning conclusion , to provide a reference for engineering design .