本文選題：凍土　切入點(diǎn)：水熱力耦合模型　出處：《冰川凍土》2017年01期

【摘要】：開展凍土水熱力三場(chǎng)耦合研究對(duì)解決寒區(qū)工程問(wèn)題具有重要的理論指導(dǎo)意義。歸納了凍土水熱力耦合的理論基礎(chǔ),認(rèn)為目前的水分遷移驅(qū)動(dòng)力假說(shuō)仍然不能很好地解釋水分遷移現(xiàn)象,分凝冰的形成機(jī)制及判據(jù)仍需進(jìn)行深入的研究。分類和評(píng)價(jià)了常見(jiàn)的正凍土水熱力耦合模型,發(fā)現(xiàn)流體動(dòng)力學(xué)模型雖然能夠很好地描述水熱遷移現(xiàn)象,但未考慮非連續(xù)冰透鏡體;而較復(fù)雜的剛冰模型雖然考慮了凍結(jié)緣內(nèi)水熱遷移耦合現(xiàn)象,但是參數(shù)眾多;熱力學(xué)模型從微觀角度描述了凍土水熱力并考慮孔隙吸力,但仍存在參數(shù)眾多的問(wèn)題。同時(shí),對(duì)預(yù)融膜理論在凍土水熱力耦合問(wèn)題中的應(yīng)用進(jìn)行了分析和展望,認(rèn)為可以借助預(yù)融膜理論對(duì)凍土水熱力耦合中的能量、水分遷移驅(qū)動(dòng)力以及遷移速率等進(jìn)行描述。最后,基于凍土水熱力三場(chǎng)耦合研究現(xiàn)狀及存在的問(wèn)題,提出了凍土水熱力耦合研究的總體構(gòu)想:研究與實(shí)際情況相符同時(shí)適用于穩(wěn)態(tài)及非穩(wěn)態(tài)的通用數(shù)學(xué)表達(dá)式,開展凍土物理學(xué)各個(gè)參數(shù)的動(dòng)態(tài)變化研究,納入非飽和土體在凍融過(guò)程中的水熱力相互作用研究,實(shí)現(xiàn)水熱力在真正意義上的耦合,同時(shí),加強(qiáng)預(yù)融膜理論在大尺度、陸面過(guò)程以及水熱邊界等方面的應(yīng)用研究。
[Abstract]:The study of three coupling fields of frozen soil water and heat is of great theoretical significance to solve the engineering problems in cold regions.The theoretical basis of the coupling of frozen soil water and heat is summarized. It is concluded that the current hypothesis of water migration driving force still can not explain the phenomenon of water migration, and the mechanism and criterion of ice separation still need to be deeply studied.The hydro-thermal coupling models of permafrost are classified and evaluated. It is found that although the hydrodynamic model can describe the phenomenon of hydrothermal migration well, it does not consider the discontinuous ice lens.The more complex rigid ice model takes into account the coupling phenomenon of water and heat transfer in the frozen edge, but there are a lot of parameters. The thermodynamic model describes the thermodynamics of frozen soil water and considers the pore suction from the microscopic point of view, but there are still many problems with the parameters.At the same time, the application of pre-thawing film theory to the thermo-mechanical coupling of frozen soil water is analyzed and prospected. It is considered that the energy, water migration driving force and migration rate can be described by pre-thawing film theory.Finally, based on the present situation and existing problems of the three fields coupling of frozen soil water and thermodynamics, the general conception of the study of frozen soil water thermal coupling is put forward: the general mathematical expression of the study is suitable for both steady and unsteady state in accordance with the actual situation.The dynamic change of physical parameters of frozen soil is studied, and the study of hydrothermal interaction of unsaturated soil during freeze-thaw process is introduced to realize the real coupling of water and heat. At the same time, the theory of pre-thawing film is strengthened on a large scale.Application of land surface processes and hydrothermal boundaries.
【作者單位】： 中國(guó)科學(xué)院西北生態(tài)環(huán)境資源研究院凍土工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);
【基金】：中國(guó)科學(xué)院“百人計(jì)劃”項(xiàng)目(張明義);中國(guó)科學(xué)院西部行動(dòng)計(jì)劃項(xiàng)目(KZCX2-XB3-19);中國(guó)科學(xué)院STS項(xiàng)目(HHS-TSS-STS-1502)資助 國(guó)家自然科學(xué)基金項(xiàng)目(41471063) 凍土工程國(guó)家重點(diǎn)實(shí)驗(yàn)室自主研究課題(SKLFSE-ZT-23)
【分類號(hào)】：P642.14

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1 宋存牛;;凍融過(guò)程中土體水熱力耦合作用理論和模型研究進(jìn)展[J];冰川凍土;2010年05期

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本文編號(hào)：1709951