有机质对软土次固结特性的影响机制研究

贺建清 王朦 陈立国 胡惠华 陈秋南

贺建清, 王朦, 陈立国, 等. 2022. 有机质对软土次固结特性的影响机制研究[J]. 工程地质学报, 30(2): 366-373. doi: 10.13544/j.cnki.jeg.2021-0288
引用本文: 贺建清, 王朦, 陈立国, 等. 2022. 有机质对软土次固结特性的影响机制研究[J]. 工程地质学报, 30(2): 366-373. doi: 10.13544/j.cnki.jeg.2021-0288
He Jianqing, Wang Meng, Chen Liguo, et al. 2022. Influence mechanism of organic matter on secondary consolidation characteristics of soft soil[J]. Journal of Engineering Geology, 30(2): 366-373. doi: 10.13544/j.cnki.jeg.2021-0288
Citation: He Jianqing, Wang Meng, Chen Liguo, et al. 2022. Influence mechanism of organic matter on secondary consolidation characteristics of soft soil[J]. Journal of Engineering Geology, 30(2): 366-373. doi: 10.13544/j.cnki.jeg.2021-0288

有机质对软土次固结特性的影响机制研究

doi: 10.13544/j.cnki.jeg.2021-0288
基金项目: 

国家自然科学基金 52078211

湖南省自然科学基金项目 2021JJ30252

详细信息
    通讯作者:

    贺建清(1964-),男,博士,教授,硕士生导师,主要从事土力学与地基基础方面的科研与教学工作. E-mail:hjqing2000@163.com

  • 中图分类号: TU447

INFLUENCE MECHANISM OF ORGANIC MATTER ON SECONDARY CONSOLIDATION CHARACTERISTICS OF SOFT SOIL

Funds: 

the National Natural Science Foundation of China 52078211

the Natural Science Foundation of Hunan Province, China 2021JJ30252

  • 摘要: 利用洞庭湖软土、高有机质含量泥炭土重塑有机质含量不同的试样,进行一维固结蠕变试验,测定其吸附结合水含量和有机质含量,确定吸附结合水含量与有机质含量的关系,研究有机质含量对软土次固结特性的影响机制。研究结果表明,土中的有机质含量越高,其吸附结合水含量越大,两者呈线性递增关系,并提出了相应的关系计算式;次固结系数与固结压力的关系曲线在结构强度附近有一个峰值点,在较大固结压力作用下,次固结系数可近似视为一不变的常数;随着土中有机质含量增加,次固结系数呈明显增加的趋势,在高应力水平下表现尤为明显,并探讨了其产生原因。研究成果对控制软土地区工后沉降有一定的指导意义。
  • 图  1  吸附结合水的形成过程

    a. 1#组土样(重塑天然土); b. 3#组土样(人工有机质软土)

    Figure  1.  Formation process of adsorbed bound water

    图  2  试样吸附结合水含量Wg与有机质含量OMC的关系

    Figure  2.  Relationship between adsorption bound water content Wg of test soils samples and organic matter content OMC

    图  3  e-lg t曲线

    a. 1#组土样(重塑天然土);b. 3#组土样(人工有机质土)

    Figure  3.  e-lg t curves

    图  4  次固结系数Cα与固结压力p的关系

    Figure  4.  Relationship between secondary consolidation coefficient Cα and consolidation pressure p

    图  5  次固结系数Cα与有机质含量OMC的关系

    Figure  5.  Relationship between secondary consolidation coefficient Cα and organic matter content OMC

    图  6  饱和软土的三相物质模型

    Figure  6.  Three-phase material model of saturated soft soil

    表  1  土样基本物理力学性质指标

    Table  1.   Basic physical and mechanical properties of soil samples

    密度
    ρ/g·cm-3
    含水量
    w/%
    土粒比重
    Gs
    孔隙比
    e
    压缩系数
    a/MPa-1
    液限
    wL/%
    塑限
    wP/%
    塑性指数
    IP
    液性指数
    IL
    黏聚力
    c/kPa
    内摩擦角
    φ/(°)
    1.78 44.2 2.61 1.06 1.02 44.1 15.26 28.84 1.03 7.6 13.83
    下载: 导出CSV

    表  2  试验土样有机质含量

    Table  2.   Organic matter content of test soil samples

    组编号 1# 2# 3# 4# 5# 6#
    试样编号 1#-1 1#-2 2#-1 2#-2 3#-1 3#-2 4#-1 4#-2 5#-1 5#-2 6#-1 6#-2
    γ/kN·m-3 17.32 17.28 17.23 17.21 17.24 17.31 17.26 17.29 17.25 17.21 17.19 17.25
    w/% 43.84 43.75 44.38 44.32 44.36 44.30 44.01 44.10 44.36 44.20 44.31 44.25
    OMC/% 2.89 3.01 6.45 6.37 9.40 8.90 12.80 13.12 16.59 16.51 19.11 18.79
    下载: 导出CSV

    表  3  试验土样的吸附结合水含量

    Table  3.   Adsorption bound water content of test soil samples

    组编号 1# 2# 3# 4# 5# 6#
    试样编号 1#-1 1#-2 2#-1 2#-2 3#-1 3#-2 4#-1 4#-2 5#-1 5#-2 6#-1 6#-2
    Wg/% 12.83 13.72 14.40 13.75 14.62 14.26 16.02 15.25 16.11 16.70 17.56 16.49
    下载: 导出CSV
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  • 收稿日期:  2021-05-26
  • 修回日期:  2021-08-20
  • 刊出日期:  2022-04-25

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