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《Chinese Journal of Underground Space and Engineering》 2007-06
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Meso-structural Character and Numerical Simulation of Temperature Field of Frozen-rock

LIU Hui1,YANG Geng-she1,TIAN Jun-feng1,XU Jiang1,2(1.Institute of Architecture and Civil Engineering,Xi'an University of Science &Technology,Xi'an 710054,China;2.2.Kunshan Design Institute of Urban Constrution and Development Company Ltd.Su Zhou 215300,China)  
The internal structure of frozen-rock is complicated and the thermal characteristics of frozen-rock is closely related to its meso-structure.With the quick development of computer technique,digital image processing has been successfully used in geotechnical engineering.Based on digital image processing,meso-structure of frozen-rock by taking into account the actual material inhomogeneity is constructed.Digital image processing method can be used as a measurement tool to construct a digital representation for actual spatial distribution of different materials in rock.The meso-structural model can accurately describe the spatial distribution of rock and meso-medium.Using geometry transformation,the meso-structure model of frozen-rock under dual digital image has been translated into a document format which can be received by finite element software.By this step,the numerical simulation of actual meso-structures of frozen-rock is carried out.The numerical simulation for temperature field law of frozen-rock during frost-thaw cycles under subzero temperature condition has been done.Simulation results show that: meso-structure of rock determines distribution of temperature field of freezing-thawing rock and has an indispensable influence on frost-thaw damage process.The proposed approach can grope the hazard reasons in the eyes of meso-scale and provide a new way to research the inherent mechanism of frost heave and thaw settlement and the consolidation of frozen ground.This approach can be used to realize the quantitative analysis of thermal and mechanical characteristics of frost-thaw rock accounting meso-structure of rock.
【Fund】: 国家自然科学基金资助项目(40372119);; 教育部优秀青年教师基金资助项目(2091)
【CateGory Index】: TU452
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