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冻融作用下污泥固化轻质土动力特性及结构演化

杨爱武 王斌彬 钟晓凯

杨爱武, 王斌彬, 钟晓凯. 冻融作用下污泥固化轻质土动力特性及结构演化[J]. 水文地质工程地质. doi: 10.16030/j.cnki.issn.1000-3665.202103013
引用本文: 杨爱武, 王斌彬, 钟晓凯. 冻融作用下污泥固化轻质土动力特性及结构演化[J]. 水文地质工程地质. doi: 10.16030/j.cnki.issn.1000-3665.202103013
YANG Aiwu, WANG Binbin, ZHONG Xiaokai. Dynamic and structural characteristics of sludge solidified light soil under freezing-thawing action[J]. Hydrogeology & Engineering Geology. doi: 10.16030/j.cnki.issn.1000-3665.202103013
Citation: YANG Aiwu, WANG Binbin, ZHONG Xiaokai. Dynamic and structural characteristics of sludge solidified light soil under freezing-thawing action[J]. Hydrogeology & Engineering Geology. doi: 10.16030/j.cnki.issn.1000-3665.202103013

冻融作用下污泥固化轻质土动力特性及结构演化

doi: 10.16030/j.cnki.issn.1000-3665.202103013
基金项目: 国家自然科学基金项目(51978440);天津市科技计划项目(19JCZDJC39700;19JCQNJC06900)
详细信息
    作者简介:

    杨爱武(1971-),男,教授,博士生导师,主要从事软黏土力学特性及土体微观结构研究。E-mail: tulilab@163.com

  • 中图分类号: TU411.8

Dynamic and structural characteristics of sludge solidified light soil under freezing-thawing action

  • 摘要: 冻融作用会影响污泥固化轻质土动力特性和结构特性。为研究不同冻融循环次数和冻结温度下的污泥固化轻质土动力特性及结构演化,对冻融循环作用后的污泥固化轻质土进行动三轴试验和固结试验。试验结果表明:在冻融循环作用下,污泥固化轻质土动应力-应变曲线呈弱应变硬化型。污泥固化轻质土动强度和变形随着冻融次数(n)的增加和冻结温度(T)的降低而减小。经历前4次冻融作用后,对固化土变形和动强度影响较大,经历8次冻融循环后基本趋于稳定。冻融循环对土体动力特性的影响本质上是对土体结构性的影响。固化土冻融结构势(mdσn)的变化规律与动强度类似,随冻融次数的增加和冻结温度的降低而下降。冻融循环次数是影响污泥固化轻质土动力特性和结构性的主要因素,冻结温度为次要因素。
  • 图  1  材料配比饼状图

    Figure  1.  Pie chart of the material ratio

    图  2  峰值强度与冻融循环次数n的关系曲线

    Figure  2.  Relationship between the peak intensity and freezing-thawing cycle times n

    图  3  σd-εd曲线

    Figure  3.  σd-εd curves

    图  4  动强度曲线

    Figure  4.  Dynamic strength curves

    图  5  峰值强度与冻融次数n的关系曲线

    Figure  5.  Relationship between the peak strength and freeze-thaw times n

    图  6  Ed-εd曲线

    Figure  6.  Ed-εd curves

    图  7  e-lgp曲线

    Figure  7.  e-lgp curves

    图  8  m1m2mp随压力p变化曲线

    Figure  8.  Changes of m1, m2 and mp with pressure p

    图  9  不同冻融循环作用下mdσn-εd曲线

    Figure  9.  mdσn-εd curves under different freezing-thawing cycles

    表  1  试样物理特性指标

    Table  1.   Physical characteristics of the soil samples

    指标污泥黏土
    含水量w/%178.040.9
    密度ρ /(g·cm−3)1.811.76
    液限wL/%73.038.9
    塑限wP/%34.021.9
    塑性指数Ip/%39.017.0
    液限指数IL/%3.691.12
    有机质/%43.81
    下载: 导出CSV

    表  2  试验方案

    Table  2.   Test scheme

    指标取值
    冻结温度T /℃−5,−10,−15,−20
    冻融次数n0,1,2,4,6,8,10
    幅值/kPa100,200,250,300,350,每级循环10周
    其他龄期:28 d;围压:40 kPa;频率:1 Hz;正弦波
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-03-03
  • 修回日期:  2021-06-02
  • 网络出版日期:  2021-11-19

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