本文關(guān)鍵詞： 列車(chē)荷載 重塑軟黏土 振動(dòng)頻率 破壞標(biāo)準(zhǔn) 動(dòng)強(qiáng)度　出處：《巖土工程學(xué)報(bào)》2017年S1期 　論文類(lèi)型：期刊論文

【摘要】：列車(chē)荷載在地基土體中引發(fā)一種心形線主應(yīng)力軸旋轉(zhuǎn)動(dòng)力路徑,考慮頻率作用時(shí),會(huì)對(duì)地基土產(chǎn)生更為復(fù)雜的影響。以南京河西典型重塑軟黏土為對(duì)象開(kāi)展數(shù)組不同頻率f和動(dòng)應(yīng)力比η的不排水空心扭剪試驗(yàn)。試驗(yàn)發(fā)現(xiàn),不同動(dòng)應(yīng)力比下,土體變形隨振動(dòng)頻率的變化趨勢(shì)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(dòng)應(yīng)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(dāng)f=0.5 Hz時(shí),孔壓發(fā)展顯著增大。提出一種適用于列車(chē)荷載下考慮頻率影響的重塑軟黏土破壞評(píng)價(jià)方法。該標(biāo)準(zhǔn)以孔壓 應(yīng)變耦合曲線為主要辨識(shí)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(kāi)展列車(chē)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(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室;濟(jì)南軌道交通集團(tuán)有限公司;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(51479060) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金項(xiàng)目(2015B28214) 山東省住房與城鄉(xiāng)建設(shè)廳科技項(xiàng)目(2014QG009)
【分類(lèi)號(hào)】：TU447;U213.1

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