摘要
砂土的原位状态性能一直以来都难以得到有效评价,其中非常重要的一个原位状态参数则是砂土的体积变化评价指标。对近年来以静力触探(CPT)、孔压静力触探为代表的原位测试的状态参数评估方法的研究成果及其应用实践进行了回顾。评估方法主要从相对密实度和状态参数两方面展开,同时论述了各方法的优缺点。开展了南京河砂CPT标定罐试验以及江苏典型测试场地多功能CPTU原位测试,重点呈现了以CPT测试、地震波CPTU测试、电阻率CPTU测试原位状态特性评价的研究成果。建立了基于CPT测试的南京砂相对密实度评估方法及砂土原位状态参数高阶确定方法;提出了电学剪胀指标,并构建了土体状态评估的状态参数差与电学剪胀参数图表法;结合多功能CPTU状态参数确定方法的研究成果,形成了基于多功能CPTU测试的无黏性土原位状态特性综合评估体系。
The in situ state performance of sand has always been difficult to evaluate effectively, and one of the most important in situ state parameters is the evaluation index of sand volume change. The research results and application practice of state parameter evaluation methods using in situ tests represented by the cone penetration test(CPT) and piezocone penetration test(CPTU) in recent years are reviewed. The evaluation methods are mainly the relative density method and state parameter method;the advantages and disadvantages of each method are discussed herein. Nanjing River sand CPT calibration chamber tests and the multifunctional CPTU in situ tests in Jiangsu province were performed, focusing on the in situ state characteristics evaluation research results of CPT tests, seismic CPTU tests, and resistivity CPTU tests. A method for evaluating the relative density of Nanjing sand based on the CPT test was established and a high-level determination method for the in situ state parameters of sand was developed;further, the electrical dilatancy index was proposed and a graph method of the state parameter difference and the electrical dilatancy parameter for soil state evaluation were constructed. By combining the research results of state parameter determination methods based on multifunctional CPTU testing, a comprehensive evaluation system of the in situ state characteristics of cohesionless soils was developed.
作者
段伟
蔡国军
刘松玉
董晓强
陈瑞锋
DUAN Wei;CAI Guo-jun;LIU Song-yu;DONG Xiao-qiang;CHEN Rui-feng(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Institute of Geotechnical Engineering,Southeast University,Nanjing 211189,Jiangsu,China;School of Civil Engineering,Anhui Jianzhu University,Hefei 230601,Anhui,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2022年第1期200-209,共10页
China Journal of Highway and Transport
基金
国家重点研发计划项目(2020YFC1807200)
国家自然科学基金项目(52108332,42072299,41877231)
中国博士后科学基金项目(2021M702421)。
关键词
道路工程
孔压静力触探
电阻率
剪切波速
状态参数
相对密实度
road engineering
piezocone penetration test
resistivity
shear wave velocity
state parameter
relativedensity
作者简介
段伟(1989-),男,山西太原人,工学博士,博士后,E-mail:zbdxdw@163.com;通讯作者:蔡国军(1977-),男,山东兖州人,教授,博士研究生导师,工学博士,E-mail:focuscai@163.com。
