深厚土层冻结过程的水热力耦合分析
Heat-moisture-stress Coupling of Deep Thick Soil in Freezing Process
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摘要: 煤炭开发已成深部开采,围压和孔隙水压力的急剧增大使得浅层冻土的研究成果不适用于深层冻土。针对高围压和高孔隙水压力对冻土冻结过程的影响这一关键问题,基于传热学、渗流理论及结构力学相关理论,建立温度场、水分场和应力场耦合问题的数学模型,对深厚土层冻结过程中温度变化、水分迁移速度、冻结应力及冻胀变形进行分析。分析表明高围压对冻胀有抑制作用,但在冻土内部可产生很大的应力积累,对深厚冲积层冻结施工危害极大。Abstract: Coal mining has developed gradually to deep mining.With the sharp increasing of confining pressure and pore-water pressure,the research results of shallow frozen soil are not suitable for deep frozen soil.Aiming at the key problem that high confining pressure and high pore-water pressure impacting on the freezing process,based on heat transfer,percolation theory and structural mechanics correlation theory,a mathematical model of coupled moisture,temperature and stress was established to analyze the temperature changes,moisture migration velocity,frozen stress and frost deformation of deep thick soil in freezing process.The calculation results showed that high confining pressure could inhibit the frost heaving,but frozen soil had a great internal stress accumulation,which had great harm to freeze construction in deep alluvium.
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Keywords:
- deep thick soil /
- freezing process /
- heat-moisture-stress coupling /
- frost heave
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