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崔高航,张玳笠,朱成浩,等. 冻融对严寒地区湿地软土路基累积应变影响[J]. 科学技术与工程, 2021, 21(4): 1499-1505.
CUI Gao-hang,ZHANG Dai-li,ZHU Chen-hao,et al.Influence of freeze-thaw cycle on the accumulated strain of Wetland Soft Soil Subgrade in severe cold area[J].Science Technology and Engineering,2021,21(4):1499-1505.
冻融对严寒地区湿地软土路基累积应变影响
Influence of freeze-thaw cycle on the accumulated strain of Wetland Soft Soil Subgrade in severe cold area
投稿时间:2020-04-21  修订日期:2020-10-30
DOI:
中文关键词:  动三轴试验  湿地路基原状土  冻融循环  冻融平均增长比  振次—累积应变曲线  
英文关键词:dynamic triaxial test  subgrade undisturbed soil  freeze-thaw cycle  average growth ratio of freeze-thaw  cumulative strain curve  
基金项目:,中央高校基本科研业务费项目(DL12CB03);黑龙江自然科学(SE201149)
           
作者单位
崔高航 东北林业大学土木工程学院
张玳笠 东北林业大学土木工程学院
朱成浩 东北林业大学土木工程学院
席晨 东北林业大学土木工程学院
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中文摘要:
      以绥满高速卧白施工段湿地路基软土为研究对象,将土样经过不同冻融循环处理后进行GDS动三轴试验,分析该湿地地区的路基软土受冻融作用后,在不同动应力下,累积应变随振次的变化规律。结果表明:在加载初期(N≤500),累积塑性应变会随着振次的增加而迅速增加,而当振次N≥1 000后,其增长速率逐渐减缓且趋于平稳;随着冻融循环次数的增加,累积塑性应变量增大;随着振次的增大,滞回圈越来越瘦小,滞回圈的排布也越来越密集;提出平均增长比lp,aver,用以表示间隔某几次冻融前后的最终累积塑性应变差值Δεp受冻融影响的程度;提出一种新的累积塑性应变拟合模型,缩小了指数模型累积塑性应变随振次变化的程度,该模型更加符合“稳定型”累积塑性应变随振次发展的形态;分析了相关拟合参数随冻融循环、动应力的变化趋势。
英文摘要:
      Based on the study of silty clay of subgrade in the Wolitun-Baijiayao construction section of Suifenhe-Manzhouli expressway, the dynamic characteristics of undisturbed soil of typical subgrade affected by different freezing-thawing cycles were carried out through the GDS dynamic triaxial test, and then the law of cumulative strain with the vibration number of soil subjected to freezing-thawing action was analyzed. The results show that: at the initial stage of loading (N≤500), the cumulative plastic strain will increase rapidly with the increase of vibration number, while when the vibration number N≥1 000, the growth rate will gradually slow down and become stable. With the increase of freezing-thawing cycles, the cumulative plastic strain increases. With the increase of vibration number, the hysteretic loop becomes smaller and smaller, and the arrangement of hysteretic loop becomes more and more dense. A new formula about average growth ratio (lp,aver) is proposed. A new cumulative strain fitting model is proposed. This model is more consistent with the stable cumulative plastic strain with vibration number, and which reduces the influence degree of cumulative plastic strain of exponential model with vibration number. Finally, the influence of freeze-thaw cycle and different dynamic stress on the fitting parameters is analyzed.
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