铁道标准设计2025，Vol.69Issue(5)：57-64,8.DOI:10.13238/j.issn.1004-2954.202306290002
静力触探贯入成层土界面效应研究及工程应用
Study on Interface Effect of Layered Soil in Cone Penetration Testing and Its Engineering Application
摘要
Abstract
Cone penetration testing(CPT)is widely used in engineering investigation and design due to its advantages,such as continuous data acquisition,fast investigation speed,and consideration of the actual in-situ stress level of the soil.It has been verified that soil stratification based on CPT data is relatively accurate.During penetration through layered soil interfaces,CPT often exhibits lead-lag effects.However,research on this interface effect remains limited.To address this issue,a large deformation numerical simulation method,validated by measured data from railway engineering,was used to analyze the lead-lag effect in layered soil during CPT.A method for determining the lead-lag depth was developed and applied to the analysis of CPT data in railway engineering.The results showed that in clay-over-sand stratification,the lag effect of penetration resistance was minimally influenced by the clay-sand strength difference and the friction between the CPT probe and soil,with a lag depth of approximately 1.12 times the probe diameter.In sand-over-clay stratification,a larger clay-sand strength difference and greater CPT probe-soil friction led to a stronger lead-lag effect in penetration resistance.When determining soil stratification,the clay-sand interface should be identified at the depth where penetration resistance significantly increased,while the sand-clay interface should be determined at the midpoint of the depth range where penetration resistance decreased.CPT data analysis revealed that the accuracy of soil stratification based on the simplified discrimination method was about 89％,providing a foundation for refined soil stratification based on deep CPT.关键词
铁路工程/原位测试/静力触探/数值模拟/现场试验/成层土/界面效应Key words
railway engineering/in-situ testing/core penetration testing/numerical simulation/field test/layered soil/interface effect分类
交通运输引用本文复制引用
马鹏程,陈则连,刘润,李国和..静力触探贯入成层土界面效应研究及工程应用[J].铁道标准设计,2025,69(5):57-64,8.基金项目
天津市科技计划项目(20YFZCSN00890) （20YFZCSN00890）
中国铁路设计集团有限公司科技开发重点课题(2022A02538004,2020YY241008) （2022A02538004,2020YY241008）
