本文選題：周期溫度邊界　切入點：融化固結(jié)行為　出處：《冰川凍土》2014年04期

【摘要】：在周期溫度邊界條件下,凍土呈現(xiàn)出與常溫邊界不同的融化固結(jié)特性.基于融化固結(jié)理論提出了一種適用于周期溫度邊界條件下融化固結(jié)計算的數(shù)值模擬方法,并通過試驗驗證了該方法的有效性.通過對比分析試驗及數(shù)值結(jié)果表明,提出的數(shù)值方法能夠很好地描述周期溫度邊界條件下凍土的融化固結(jié)特性.同時,融化深度和變形均隨時間呈現(xiàn)出階梯型的變化趨勢.這是周期溫度邊界下土體融化固結(jié)行為最顯著的特點.隨著凍融次數(shù)的增加,融化深度和變形均趨近于常溫邊界條件下的結(jié)果,這表明若干個凍融循環(huán)后周期溫度邊界對融化固結(jié)行為的影響將逐漸消失.
[Abstract]:Under the condition of periodic temperature boundary, the frozen soil exhibits different melting and consolidation characteristics from the normal temperature boundary.Based on the thawing consolidation theory, a numerical simulation method for the calculation of melting consolidation at periodic temperature boundary conditions is proposed, and the validity of the method is verified by experiments.The experimental results and numerical results show that the proposed numerical method can well describe the thawing and consolidation characteristics of frozen soil under periodic temperature boundary conditions.At the same time, the melting depth and deformation show a ladder trend with time.This is the most obvious characteristic of soil melting and consolidation behavior at periodic temperature boundary.With the increase of freeze-thaw times, the thawing depth and deformation tend to the results of the boundary condition at room temperature, which indicates that the influence of the periodic temperature boundary on the thawing consolidation behavior will gradually disappear after several freeze-thaw cycles.
【作者單位】： 蘭州大學(xué)土木工程與力學(xué)學(xué)院;中國地震局蘭州地震研究所;
【基金】：國家自然科學(xué)基金項目(41201064;50978239) 中國科學(xué)院寒區(qū)旱區(qū)環(huán)境與工程研究所人才成長基金項目(Y451091001)資助
【分類號】：U416.1
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本文編號：1696457