地鐵列車動荷載作用下飽和軟黏土累積塑性應(yīng)變計(jì)算模型研究*
孫玉永1，周順華2，肖紅菊1
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（1 銅陵學(xué)院建筑工程學(xué)院， 銅陵 244000； 2 同濟(jì)大學(xué)道路與交通工程教育部重點(diǎn)實(shí)驗(yàn)室，上海 201804）
［摘要］針對寧波地區(qū)②層淤泥質(zhì)黏土和④層黏土進(jìn)行了豎向應(yīng)力與水平應(yīng)力比值K0分別為0.7,0.6固結(jié)下的動三軸試驗(yàn)。結(jié)果表明，該兩層土的累積塑性應(yīng)變與振次成指數(shù)關(guān)系，振動頻率對其累積塑性應(yīng)變存在一定影響。在既有累積塑性應(yīng)變計(jì)算模型基礎(chǔ)上，通過引入等效系數(shù)δ將最小動偏應(yīng)力qds等效為循環(huán)動應(yīng)力的一部分，建立了考慮最小動偏應(yīng)力影響的飽和軟黏土累積塑性應(yīng)變計(jì)算模型，并利用試驗(yàn)數(shù)據(jù)驗(yàn)證了此模型的適用性。［關(guān)鍵詞］地鐵; 動荷載; 飽和軟黏土; 累積塑性應(yīng)變中圖分類號：TU435 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)21-0085-04
Study on the accumulative plastic strain calculation model of saturated soft clay under subway dynamic loadsSun Yuyong1, Zhou Shunhua2, Xiao Hongju1(1 College of Civil Engineering, Tongling University, Tongling 244000, China; 2 Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China)Abstract: Based on the slit clay soil layer ② and clay soil layer ④ in Ningbo region, the dynamic triaxial tests were conducted under the consolidation in which the ratio K0 of vertical stress and horizontal stress is 0.7 and 0.6 respectively. The results show that the relationship between accumulated plastic strain and vibration of the two soil layers is exponential and vibration frequency has certain influence on accumulated plastic strain. Based on the existing cumulative plasticstrain calculation model and the introduction of the equivalent coefficient δ to make minimum dynamic deviator stress qds equivalent to part of cyclic dynamic stress, the cumulative plastic strain calculation model for saturated soft clay was set up considering the influence of the minimum dynamic deviator stress. The applicability of the cumulative plastic strain model was verified by the experimental results.Keywords: subway; dynamic load; saturated soft clay; accumulative plastic strain
*國家博士后基金資助（2013M541827），安徽省教育廳高校自然科學(xué)研究重點(diǎn)項(xiàng)目（KJ2015A176），安徽省自然科學(xué)基金資助（1408085ME98）。作者簡介：孫玉永，博士后，副教授，Email：sunyuyong2@126.com。
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