本文選題：軟土 + 加速蠕變　； 參考：《巖土力學(xué)》2017年02期

【摘要】：研究軟土加速蠕變過程中的微觀結(jié)構(gòu)變化可深入了解加速蠕變特性的內(nèi)在機制。在對天津濱海地區(qū)軟土進行多種條件下的三軸蠕變試驗的基礎(chǔ)上,利用微觀定量化技術(shù),對比靜、動荷載蠕變條件下土樣的微觀結(jié)構(gòu),從微觀角度對加速蠕變機制進行了解釋。研究表明,土樣產(chǎn)生加速蠕變后,結(jié)構(gòu)單元體的豐度和復(fù)雜度降低;結(jié)構(gòu)單元體形狀趨向扁圓形,邊緣趨于圓滑;土體顆粒在自然狀態(tài)下無明顯定向性,加速蠕變后其定向性顯著增強。振動荷載使得蠕變程度增大,也使得土體蠕變的速率加快。研究結(jié)果揭示了土體的加速蠕變實際上是在動荷載作用下土體的內(nèi)部結(jié)構(gòu)不斷自我調(diào)整再造的過程。
[Abstract]:The internal mechanism of accelerated creep behavior can be deeply understood by studying the microstructure change of soft soil during accelerated creep. Based on the triaxial creep tests of soft soil in Tianjin coastal area under various conditions, the microstructure of soil samples under static and dynamic loading creep conditions is compared by using micro-quantitative technique, and the accelerated creep mechanism is explained from the microscopic point of view. The results show that the abundance and complexity of structural unit body decrease after accelerated creep of soil sample, the shape of structural unit body tends to be oblate and the edge tends to be smooth, and the soil particle has no obvious orientation in natural state. After accelerated creep, its directionality is obviously enhanced. Vibration load increases the degree of creep and accelerates the creep rate of soil. The results show that the accelerated creep of soil is actually a process of self-adjustment and reconstruction of the internal structure of soil under dynamic load.
【作者單位】： 天津大學(xué)土木工程系;天津大學(xué)濱海土木工程結(jié)構(gòu)與安全教育部重點實驗室;保利(天津)房地產(chǎn)開發(fā)有限公司;
【基金】：國家自然科學(xué)基金項目(No.51378344) 天津市應(yīng)用基礎(chǔ)與前沿技術(shù)研究計劃項目(No.14JCYBJC21700) 天津市科技興海項目(No.KJXH2013-15)~~
【分類號】：TU447

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