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成层结构性软土一维非线性固结半解析分析

夏长青 胡安峰 付鹏 崔军 谢康和 周禹杉

夏长青, 胡安峰, 付鹏, 崔军, 谢康和, 周禹杉. 成层结构性软土一维非线性固结半解析分析[J]. 西南交通大学学报, 2019, 54(6): 1244-1251. doi: 10.3969/j.issn.0258-2724.20170612
引用本文: 夏长青, 胡安峰, 付鹏, 崔军, 谢康和, 周禹杉. 成层结构性软土一维非线性固结半解析分析[J]. 西南交通大学学报, 2019, 54(6): 1244-1251. doi: 10.3969/j.issn.0258-2724.20170612
XIA Changqing, HU Anfeng, FU Peng, CUI Jun, XIE Kanghe, ZHOU Yushan. Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1244-1251. doi: 10.3969/j.issn.0258-2724.20170612
Citation: XIA Changqing, HU Anfeng, FU Peng, CUI Jun, XIE Kanghe, ZHOU Yushan. Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1244-1251. doi: 10.3969/j.issn.0258-2724.20170612

成层结构性软土一维非线性固结半解析分析

doi: 10.3969/j.issn.0258-2724.20170612
基金项目: 国家自然科学基金资助项目(51778572,51278453);教育部博士点基金资助项目(20120101110029);浙江省自然科学基金资助项目(LY14E080016)
详细信息
    作者简介:

    夏长青(1991—),男,博士研究生,研究方向为软黏土力学和地基处理,E-mail:xiacq09@163.com

    通讯作者:

    胡安峰(1974—),男,副教授,研究方向为软黏土力学和地基处理、桩基工程,E-mail:anfenghu@zju.edu.cn

Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay

  • 摘要: 为了研究变荷载作用下土体结构性对成层软土固结性状的影响,基于结构性软土压缩性和渗透性的非线性变化规律,以及结构屈服应力随土体深度变化等特征,对结构性软土非线性固结问题进行了分析. 首先采用三折线压缩模型、e-lg kv渗透模型,详细分析了结构性软土在不同排水工况下的固结过程;其次,利用半解析法,建立一维固结方程,并编制程序进行求解,与目前已有的非线性固结结果进行了对比分析,验证了本文计算方法的可靠性;最后以某四层软土地基为工程背景,研究了变荷载、结构性等因素对固结性状的影响. 研究结果表明:成层结构性软土一维非线性固结过程中,当最终荷载相同,加荷速率不同时,固结前期,按应力定义的固结度大于按沉降定义的固结度,固结后期则相反;当加荷速率相同,最终荷载不同时,按应力定义和按沉降定义的固结度在固结前期均随着最终荷载的增大而减小,而在固结后期,随着最终荷载的增大而增大;考虑结构性时,按应力定义的固结度明显大于不考虑结构性的计算值,固结前期相差较大,随着固结的进行,差值逐渐减小.

     

  • 图 1  成层结构性软土地基模型

    Figure 1.  Model of multi-layered structured soft soil foundation

    图 2  三折线压缩模型

    Figure 2.  Trilinear compression model

    图 3  渗透模型

    Figure 3.  Permeability model

    图 4  单面排水固结过程

    Figure 4.  Consolidation process of single-drainage situation

    图 5  双面排水固结过程

    Figure 5.  Consolidation process of double-drainage situation

    图 6  空间离散

    Figure 6.  Schematic diagram of spatial discretization

    图 7  时间和荷载离散

    Figure 7.  Schematic diagram of temporal and loading discretization

    图 8  对比验证

    Figure 8.  Verification by comparison

    图 9  加荷速率对固结度影响

    Figure 9.  Influence of the loading rate on the degree of consolidation

    图 10  最终荷载对固结性状影响

    Figure 10.  Influence of the ultimate load on the consolidation behavior

    图 11  土体结构性对固结性状影响

    Figure 11.  Influence of structural properties on the consolidation behavior

    表  1  对比验证计算参数

    Table  1.   Calculation parameters for verification

    iCcCkkvr
    /(×10–9 m•s–1
    erσ'r
    /kPa
    γsat
    /(kN•m–3
    hi/ m
    10.3820.7653.6281.39310018.313
    20.5210.5250.8151.42210018.185
    30.6280.4180.4341.50110017.918
    40.2860.3581.1281.05810018.624
    下载: 导出CSV

    表  2  4层地基计算参数

    Table  2.   Calculation parameters for four layered soils

    参数土层
    1234
    CCN 0.071 0.056 0.039 0.052
    CCT 0.431 0.632 0.496 0.308
    CCR 0.226 0.335 0.271 0.209
    Ck 0.634 0.532 0.474 0.310
    kvr/(×10–9 m•s–1 2.526 5.335 3.761 2.169
    er 1.471 1.307 1.289 1.095
    σ'r/kPa 100 100 100 100
    γsat/(kN•m–3 18.35 18.23 17.89 18.64
    K1 1.209 1.209 1.209 1.209
    K2/kPa 50 50 50 50
    hi/m 2 6 7 5
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-08-11
  • 修回日期:  2018-06-26
  • 网络出版日期:  2019-03-21
  • 刊出日期:  2019-12-01

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