發(fā)布時(shí)間：2018-04-10 09:09

  本文選題：列車荷載　切入點(diǎn)：非共軸　出處：《巖土力學(xué)》2017年01期

【摘要】：采用空心圓柱儀對(duì)重塑空心軟黏土試樣開(kāi)展了一系列非破壞試驗(yàn),研究了列車循環(huán)動(dòng)荷載作用下的性狀。試驗(yàn)中主要選取心形應(yīng)力路徑,以圓形應(yīng)力路徑為輔助,對(duì)比分析了兩種應(yīng)力路徑下軟土的非共軸應(yīng)變特征,探究循環(huán)振次對(duì)非共軸特性的影響、荷載頻率的大小對(duì)非共軸角與大主應(yīng)力方向角關(guān)系曲線形態(tài)變化的影響,同時(shí)進(jìn)行了機(jī)制分析,并與另一動(dòng)應(yīng)力水平下試驗(yàn)結(jié)果進(jìn)行了對(duì)比論證。此外,在不考慮頻率影響下建立了簡(jiǎn)化的非共軸角與大主應(yīng)力方向角之間的關(guān)系模型。研究發(fā)現(xiàn),在大主應(yīng)力方向角旋轉(zhuǎn)的任意周期內(nèi),心形與圓形兩種應(yīng)力路徑下非共軸角隨大主應(yīng)力方向角變化趨勢(shì)各自有明顯特點(diǎn),相同動(dòng)應(yīng)力水平下兩種應(yīng)力路徑產(chǎn)生的偏應(yīng)力增量引起的單位偏應(yīng)變?cè)隽看笮∫灿兴鶇^(qū)別,但在大主應(yīng)力方向角旋轉(zhuǎn)的局部角度內(nèi),兩種應(yīng)力路徑下的偏應(yīng)變?cè)隽肯嘟?心形應(yīng)力路徑下的非共軸角以及偏應(yīng)力增量引發(fā)的單位偏應(yīng)變?cè)隽看笮∈苎h(huán)振次的影響不明顯,任意振次中大主應(yīng)力方向角在[-30°,40°]弧度區(qū)間內(nèi)對(duì)應(yīng)的偏應(yīng)變?cè)隽窟h(yuǎn)大于該區(qū)間之外的偏應(yīng)變?cè)隽?隨著頻率增大,非共軸角隨大主應(yīng)力方向角的變化呈現(xiàn)越來(lái)越明顯的波動(dòng)。
[Abstract]:A series of non-destructive tests were carried out on the remolded hollow soft clay samples by a hollow cylinder instrument, and the behavior of the remolded soft clay samples under cyclic loading of trains was studied.In the experiment, the heart-shaped stress path is selected, and the circular stress path is used as the assistant. The characteristics of non-coaxial strain of soft soil under two stress paths are compared and analyzed, and the influence of cyclic vibration times on the non-coaxial characteristics is explored.The influence of load frequency on the shape change of the curve of non-coaxial angle and direction angle of large principal stress is discussed. The mechanism of the curve is analyzed, and the experimental results are compared with the experimental results under other moving-stress levels.In addition, a simplified model of the relationship between the non-coaxial angle and the direction angle of large principal stress is established without considering the influence of frequency.It is found that in any period of rotation in the direction of large principal stress, the variation trend of non-coaxial angle with the direction of large principal stress has obvious characteristics under the two stress paths of heart and circle.Under the same dynamic stress level, the increment of unit strain caused by the increment of deviant stress caused by two stress paths is also different, but the increment of strain is similar in the local angle of rotation in the direction of large principal stress direction.The non-coaxial angle and the increment of unit deflection strain caused by the increment of deviant stress are not affected by the cyclic vibration times obviously under the heart-shaped stress path.The increment of deflection strain in the range of [-30 擄~ 40 擄] radians is much larger than that outside the range, and with the increase of frequency, the variation of non-coaxial angle with the direction of large principal stress is more and more obvious.
【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;河海大學(xué)江蘇省巖土工程技術(shù)工程研究中心;重慶大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(No.51479060) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(No.2015B28214)~~
【分類號(hào)】：U213.1;TU447

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