發(fā)布時間：2018-03-01 05:29

  本文關(guān)鍵詞： 列車荷載 重塑軟黏土 振動頻率 破壞標準 動強度　出處：《巖土工程學報》2017年S1期 　論文類型：期刊論文

【摘要】：列車荷載在地基土體中引發(fā)一種心形線主應力軸旋轉(zhuǎn)動力路徑,考慮頻率作用時,會對地基土產(chǎn)生更為復雜的影響。以南京河西典型重塑軟黏土為對象開展數(shù)組不同頻率f和動應力比η的不排水空心扭剪試驗。試驗發(fā)現(xiàn),不同動應力比下,土體變形隨振動頻率的變化趨勢主要分為兩種情況。另外,隨著頻率f的提高,試樣發(fā)生破壞的臨界動應力比η'先減小后增大。頻率f在1.0~2.0 Hz范圍內(nèi),孔壓發(fā)展曲線受頻率影響較小,當f=0.5 Hz時,孔壓發(fā)展顯著增大。提出一種適用于列車荷載下考慮頻率影響的重塑軟黏土破壞評價方法。該標準以孔壓 應變耦合曲線為主要辨識曲線,可以判別試樣所屬的穩(wěn)定、臨界或破壞型狀態(tài),為后續(xù)開展列車荷載引起的軟黏土地基承載力研究提供理論支持。
[Abstract]:The train load causes a kind of rotating dynamic path of the principal stress axis of the heart-line in the foundation soil, considering the effect of the frequency, Taking typical remolded soft clay in Hexi, Nanjing as an object, the undrained hollow torsional shear tests with different frequency f and dynamic stress ratio 畏 are carried out. The variation trend of soil deformation with vibration frequency is mainly divided into two situations. In addition, with the increase of frequency f, the critical dynamic stress ratio 畏 'decreases first and then increases. The frequency f is in the range of 1.0 ~ 2.0 Hz. The development curve of pore pressure is less affected by frequency, when f0. 5 Hz, A method for evaluating the failure of remolded soft clay under train load considering frequency is proposed. The main identification curve is the coupling curve of pore pressure and strain, which can be used to judge the stability of the sample. The critical or destructive state provides theoretical support for further research on the bearing capacity of soft clay foundation caused by train load.
【作者單位】： 河海大學巖土力學與堤壩工程教育部重點實驗室;濟南軌道交通集團有限公司;
【基金】：國家自然科學基金面上項目(51479060) 中央高�；究蒲袠I(yè)務費專項資金項目(2015B28214) 山東省住房與城鄉(xiāng)建設廳科技項目(2014QG009)
【分類號】：TU447;U213.1

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