土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (4): 532-536.

• 测试技术 • 上一篇    下一篇

基于扁铲侧胀试验与静力触探试验的砂土应力历史研究

肖 玮   

  1. (浙江省交通规划设计研究院有限公司，杭州 310000)
  • 收稿日期:2019-10-11 修回日期:2019-10-17 出版日期:2020-08-20 发布日期:2020-08-15
  • 作者简介:肖 玮（1988-），男，工程师，研究方向为岩土工程勘察及原位测试。

Characterization of Stress History of Sandy Soils by Flat Dilatometer and Cone Penetrometer Testing#br#

XIAO Wei   

  1. (Zhejiang Provincial  Instituteof Communications Planning, Design & Research Co.,Ltd., Hangzhou 310000)
  • Received:2019-10-11 Revised:2019-10-17 Online:2020-08-20 Published:2020-08-15

摘要： 土体的应力历史反映天然土在形成过程及其地质历史中，土中有效应力的变化过程，评价土体的应力历史是岩土工程勘察中的重要工作内容。主要研究利用原位测试方法对砂土的应力历史进行评价，综合使用扁铲侧胀试验压缩模量与静力触探试验锥尖阻力的比值MDMT/qc评价砂土的超固结比OCR，由此推测砂土的应力历史。同时，也建立了以扁铲侧胀水平应力指数KD与超固结比OCR的OCR～KD相关关系，并依托武汉市轨道交通工程实例，验证了利用单一测试参数KD的计算公式并非对所有砂土都适用，而综合多个参数建立的超固结比具有一般性，适用性广。

关键词: 扁铲侧胀试验, 静力触探试验, 超固结比, 应力历史, 砂土

Abstract: The stress history of soil reflects the evolution of effective stress in natural soils in the geological history. The evaluation of the stress history of the soil is an important aspect in the geotechnical engineering investigation. This paper presents the insitu evaluation of overconsolidation ratio (OCR) in sandy soils. In particular the correlation between the OCR values and the compression modulus from the flat dilatometer testing (DMT) as well as the tip resistance ratio from cone penetrometer testing (CPT) are2 established. The case history shows that the empirical relationship using the singlet parameter KD is not applicable to all sandy soils, but the overconsolidation ratio established from the ratio multi parameters are more applicable in different soil types.

Key words: Flat Dilatometer Test, Cone Penetration Test, Over-Consolidation Ratio, Stress History, Sandy Soils

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