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。
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)are2established.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.
作者
肖玮
XIAO Wei(Zhejiang Provincial Instituteof Communications Planning,Design&Research Co.,Ltd.,Hangzhou 310000)
出处
《土工基础》
2020年第4期532-536,共5页
Soil Engineering and Foundation
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
Flat Dilatometer Test
Cone Penetration Test
Over-Consolidation Ratio
Stress History
Sandy Soils
