考虑应力历史和应力水平影响的土体压缩模量计算方法

曹宇清 吴永 安向勇 苏晓学 樊习英 巩天真

曹宇清, 吴永, 安向勇, 苏晓学, 樊习英, 巩天真. 2019: 考虑应力历史和应力水平影响的土体压缩模量计算方法. 工程地质学报, 27(4): 760-765. doi: 10.13544/j.cnki.jeg.yt2019395
引用本文: 曹宇清, 吴永, 安向勇, 苏晓学, 樊习英, 巩天真. 2019: 考虑应力历史和应力水平影响的土体压缩模量计算方法. 工程地质学报, 27(4): 760-765. doi: 10.13544/j.cnki.jeg.yt2019395
CAO Yuqing, WU Yong, AN Xiangyong, SU Xiaoxue, FAN Xiying, GONG Tianzhen. 2019: CALCULATION METHOD FOR OEDOMETRIC MODULUS OF SOIL WITH EFFECTS OF STRESS HISTORY AND STRESS LEVEL. JOURNAL OF ENGINEERING GEOLOGY, 27(4): 760-765. doi: 10.13544/j.cnki.jeg.yt2019395
Citation: CAO Yuqing, WU Yong, AN Xiangyong, SU Xiaoxue, FAN Xiying, GONG Tianzhen. 2019: CALCULATION METHOD FOR OEDOMETRIC MODULUS OF SOIL WITH EFFECTS OF STRESS HISTORY AND STRESS LEVEL. JOURNAL OF ENGINEERING GEOLOGY, 27(4): 760-765. doi: 10.13544/j.cnki.jeg.yt2019395

考虑应力历史和应力水平影响的土体压缩模量计算方法

doi: 10.13544/j.cnki.jeg.yt2019395
基金项目: 

国网山西省电力公司科技项目 SGSXJYOOPSJS1800005

详细信息
    作者简介:

    曹宇清(1968-), 男, 学士, 从事工程管理工作.Email:543354191@qq.com

    通讯作者:

    吴永(1986-), 男, 硕士, 主要从事桥梁与隧道检测工作.Email:liulin@imech.ac.cn

  • 中图分类号: P642.3

CALCULATION METHOD FOR OEDOMETRIC MODULUS OF SOIL WITH EFFECTS OF STRESS HISTORY AND STRESS LEVEL

Funds: 

the Science and Technology Projects of State Grid Corporation of China SGSXJYOOPSJS1800005

  • 摘要: 为了考虑应力历史对地基沉降变形的影响,本文基于单对数函数,引入压缩曲线在单对数空间上曲率最小时所对应的竖向应力(简称特征应力),建立了能够描述正常固结黏土、超固结黏土和砂土的压缩线表达式。然后,基于该表达式提出完全侧限条件下的压缩模量计算式,并分析了特征应力和压缩指数对压缩模量的影响规律。最后,通过与室内试验结果和实际工程中地基变形进行对比,验证了本文所提方法的合理性。
  • 图  1  超固结土压缩线示意图

    Figure  1.  Compression line of overconsolidated soil

    图  2  压缩模量随特征应力的演化规律

    Figure  2.  Evolution law of oedometric modulus as special vertical stress changes

    图  3  压缩模量随压缩指数的演化规律

    Figure  3.  Evolution law of oedometric modulus as compression index changes

    图  4  压缩模量的计算结果和试验结果的比较

    a.粉土; b.粉土; c.粉土黏土; d.粉土夹粉质黏土

    Figure  4.  Comparison between calculation results and test results of oedometric modulus

    表  1  试验土的基本物理指标

    Table  1.   Physical indexes of soil

    土的种类 含水率/% 干密度/ (g·cm-3) 内摩擦角/(°) 黏聚力/kPa 初始孔隙比e0
    ①粉土 17 1.42 18.7 9.5 1.22
    ②粉土 23.8 1.45 21.8 10.4 1.30
    ③粉质黏土 24.5 1.45 16.5 22.5 1.32
    ④粉土夹粉质黏土 25.0 1.46 22.7 11.5 1.31
    下载: 导出CSV

    表  2  材料参数

    Table  2.   Material parameters

    土的种类 压缩指数 σvc/kPa
    ①粉土 0.14 220
    ②粉土 0.14 190
    ③粉质黏土 0.15 220
    ④粉土夹粉质黏土 0.1 160
    下载: 导出CSV

    表  3  材料参数

    Table  3.   Material parameters

    土的种类 压缩指数 初始孔隙比
    ②粉土黏土 0.133/ln10 0.96
    ③淤泥质粉质黏土 0.21/ln10 1.2
    ④淤泥质黏土 0.38/ln10 1.47
    ⑤粉质黏土 0.38/ln10 0.94
    下载: 导出CSV

    表  4  本文计算过程

    Table  4.   Calculation procedure

    土层 σszi/kPa Hi/cm σvc/kPa σzi/kPa Δe ΔS/cm
    29 160 58 84 0.039 3.2
    119 520 209 68.3 0.017 4.1
    202 500 303 45.6 0.014 2.89
    292 500 292 44.6 0.012 3.13
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-03-18
  • 修回日期:  2019-06-20
  • 刊出日期:  2019-08-25

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