摘要
对湖南省某高速公路路基土采用孔压静力触探仪(CPTU)进行了原位测试,并取不同深度处的原状土样在室内测定其压缩模量。根据现场CPTU测试数据和室内压缩模量测试结果进行了土层的划分,评价了多个现有基于CPTU数据的土体压缩模量预估经验公式的适用性,进而建立了压缩模量与CPTU锥尖阻力之间的相关关系。研究结果表明:采用CPTU原位探测数据进行土层划分具有良好的可靠性,土体压缩模量与CPTU测试中的锥尖阻力之间存在强相关性。建立的基于CPTU的压缩模量预估公式可为量化软土层压缩特性提供参考,是公路工程中软土层路基沉降分析的科学依据。
In this paper,through the in-situ CPTU test of the subgrade soil of an expressway in Hunan Province,the compression modulus of undisturbed soil samples at different depths was measured in the laboratory.According to the CPTU test data and the compression modulus test results,the soil layers were divided,and the applicability of several existing empirical formulas for calculating the compression modulus of soil based on the CPTU collected data was evaluated.Then the correlation between the compression modulus and CPTU cone resistance was established.The results show that:it is reliable to use CPTU in-situ detection data to profile soil layers.There is a strong correlation between the compression modulus of soil and the cone resistance in CPTU test.The compression modulus prediction formula based on CPTU,established in this paper,can provide ar eference for quantifying the compression characteristics of soft soil layer,and is the scientific basis for the settlement analysis of soft soil foundation in highway engineering.
作者
孙昌开
SUN Changkai(HNCEG Communications Construction Co.,Ltd.,Changsha,Hunan 410004,China)
出处
《公路工程》
2023年第2期81-85,共5页
Highway Engineering
基金
湖南省交通运输厅科技项目(201905)。
