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基于CPTU状态参数的无黏性土最大剪切模量评价方法

段伟 蔡国军 刘松玉

段伟, 蔡国军, 刘松玉. 基于CPTU状态参数的无黏性土最大剪切模量评价方法[J]. 西南交通大学学报, 2019, 54(4): 801-807. doi: 10.3969/j.issn.0258-2724.20170432
引用本文: 段伟, 蔡国军, 刘松玉. 基于CPTU状态参数的无黏性土最大剪切模量评价方法[J]. 西南交通大学学报, 2019, 54(4): 801-807. doi: 10.3969/j.issn.0258-2724.20170432
DUAN Wei, CAI Guojun, LIU Songyu. Evaluation Method of Maximum Shear Modulus of Cohesionless Soil Based on State Parameters from Piezocone Penteration Test[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 801-807. doi: 10.3969/j.issn.0258-2724.20170432
Citation: DUAN Wei, CAI Guojun, LIU Songyu. Evaluation Method of Maximum Shear Modulus of Cohesionless Soil Based on State Parameters from Piezocone Penteration Test[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 801-807. doi: 10.3969/j.issn.0258-2724.20170432

基于CPTU状态参数的无黏性土最大剪切模量评价方法

doi: 10.3969/j.issn.0258-2724.20170432
基金项目: 国家重点研发计划资助项目(2016YFC0800200);国家自然科学基金资助项目(41672294);中央高校基本科研业务费专项资金、江苏省研究生科研与实践创新计划资助项目(KYCX17_0139)
详细信息
    作者简介:

    段伟(1989—),男,博士研究生,研究方向为现代原位测试技术,E-mail:zbdxdw@163.com

    通讯作者:

    蔡国军(1977—),男,教授,博士生导师,研究方向为现代原位测试技术,E-mail:focuscai@163.com

  • 中图分类号: V221.3

Evaluation Method of Maximum Shear Modulus of Cohesionless Soil Based on State Parameters from Piezocone Penteration Test

  • 摘要: 土体最大剪切模量是动力基础设计和地震场地响应分析的重要参数,目前该参数的确定主要来源于室内试验,但室内试验值难以反应现场土层的真实情况,因而采用原位测试技术确定土体最大剪切模量的方法备受关注. 以宿迁-新沂高速公路为工程背景,利用地震波孔压静力触探(SCPTU)对现场场地进行测试,在总结已有的最大剪切模量确定方法研究成果的基础上,以实测剪切波速计算得到的最大剪切模量作为参考值,研究了孔压静力触探(CPTU)测试参数与最大剪切模量之间的关系;基于临界状态土力学理论,研究了联合CPTU测试参数和状态参数与最大剪切模量的关系. 结果表明:最大剪切模量与CPTU测试参数存在良好的相关关系,可通过锥尖阻力和孔压参数来近似估计最大剪切模量值;将状态参数作为孔隙比或孔压参数比的有效代替参数,能够同时考虑围压应力与孔隙比双重因素,所估算的最大剪切模量与参考值基本一致. 因此,CPTU原位状态参数可作为一种新方法来初步评价无黏性土的最大剪切模量.

     

  • 图 1  现场试验示意

    Figure 1.  Field test

    图 2  宿迁高速场地各参数随深度的变化曲线

    Figure 2.  Curves of each parameter with depth at the Suqian expressway site

    图 3  基于SCPTU测试资料Gmax/(1+Bq4.59qt的关系

    Figure 3.  Gmax/(1+Bq4.59 versus qt for SCPTU test data

    图 4  SCPTU测试资料Gmax/(1+$\psi $4.59qt的关系

    Figure 4.  Gmax/(1+$\psi $4.59 versus qt for SCPTU test data

    图 5  SCPTU测试的Gmax与预测值的比较

    Figure 5.  Comparison between measured SCPTU data and inferred Gmax profiles

    表  1  试验场地土层的主要物理力学性质指标

    Table  1.   Main physico-mechanical indexes of test site soils

    层号名称深度/m含水量/%液限/%标贯击数N
    填土1.011.2731.479
    粉土4.826.1229.254
    粉质砂土6.029.4828.4310
    砂土未揭穿27.7227.6424
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出版历程
  • 收稿日期:  2017-06-20
  • 修回日期:  2018-04-08
  • 网络出版日期:  2019-04-18
  • 刊出日期:  2019-08-01

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