發(fā)布時間：2018-04-15 00:16

  本文選題：孔隙水壓力累積 + 橡膠粉末��； 參考：《巖土力學(xué)》2017年05期

【摘要】：由于重度小、滲透性強,橡膠粉末常作為邊坡、路基和擋土墻的填料,以代替部分砂土,從而提高擋土墻的安全性,并減少砂子的用量。在地震或交通荷載作用下,摻有橡膠粉末的砂土動力學(xué)特性,包括應(yīng)力-應(yīng)變關(guān)系曲線、孔隙水壓力累積規(guī)律、動剪切模量和抗液化能力方面的研究亟需開展。借助CKC循環(huán)動三軸儀,開展飽和不排水條件下?lián)接邢鹉z粉末的砂土試樣的動力學(xué)特性研究,重點評估摻入的橡膠粉末對試樣的抗液化性能的影響。研究結(jié)果發(fā)現(xiàn),摻有不同粒徑橡膠粉末的砂土對應(yīng)力-應(yīng)變關(guān)系、孔隙水壓力的影響非常顯著,同時發(fā)現(xiàn),粒徑較大的橡膠粉末可以極大地提高試樣的抗液化能力。另外,發(fā)現(xiàn)摻入量越大,對抗液化能力的提高越明顯,且隨著摻入量的提高,表現(xiàn)出與常規(guī)砂土液化不同的破壞模式。研究結(jié)果進一步明確了摻有橡膠粉末的砂土動力特性行為,為橡膠粉末在工程實踐中的應(yīng)用提供了技術(shù)依據(jù)。最后,對橡膠砂土混合的微觀機制進行了解釋。
[Abstract]:Because of its small weight and strong permeability, rubber powder is often used as filler for slope, subgrade and retaining wall to replace part of sand, thus improving the safety of retaining wall and reducing the amount of sand.Under the action of earthquake or traffic load, the dynamic characteristics of sand mixed with rubber powder, including stress-strain relationship curve, pore water pressure accumulation law, dynamic shear modulus and liquefaction resistance, need to be studied urgently.With the help of CKC cyclic triaxial apparatus, the dynamic characteristics of sand samples mixed with rubber powder under saturated undrained condition were studied, and the influence of rubber powder on the liquefaction resistance of the samples was evaluated.The results show that the influence of pore water pressure on the stress-strain relationship of sand with different size of rubber powder is very significant. At the same time, it is found that rubber powder with larger particle size can greatly improve the liquefaction resistance of the sample.In addition, it is found that the larger the mixing amount, the more obvious the anti-liquefaction ability is, and with the increase of the mixing amount, the failure mode is different from that of conventional sand liquefaction.The research results further clarify the dynamic behavior of sand mixed with rubber powder and provide the technical basis for the application of rubber powder in engineering practice.Finally, the microcosmic mechanism of rubber sand mixing is explained.
【作者單位】： 桂林理工大學(xué)廣西巖土力學(xué)與工程重點實驗室;同濟大學(xué)地下建筑與工程系;
【基金】：廣西巖土力學(xué)與工程重點實驗室資助課題(No.13-KF-04) 浙江省自然科學(xué)基金(No.LY17E080012) 國家自然科學(xué)基金(No.11372228)~~
【分類號】：TU411.8
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本文編號：1751662