粉质黏土压缩变形特征试验研究  

Experimental Study on Compression Deformation Characteristics of Silty Clay

作　　者：冯泽 FENG Ze(Hainan Hydrogeological Engineering Geological Survey Institute,Haikou Hainan 571100,China)

机构地区：[1]海南水文地质工程地质勘察院,海南海口571100

出　　处：《北方建筑》2025年第2期113-117,共5页Northern Architecture

摘　　要：为准确掌握黏性土的压缩变形特性,以某房建项目的粉质黏土为研究对象。通过静力触探、室内试验和旁压试验相结合的方法,对粉质黏土的压缩模量进行了计算。分别构建了粉质黏土的液限、天然含水率及孔隙比与其压缩指数间的关系函数,以实现粉质黏土的压缩指数的计算。分析结果表明:静力触探计算得到的压缩模量范围为5.06 MPa~5.42 MPa,平均值为5.25 MPa;室内试验计算得到的压缩模量范围为4.95 MPa~5.39 MPa,平均值为5.23 MPa;旁压试验计算得到的压缩模量范围为5.08 MPa~5.51 MPa,平均值为5.29 MPa。三者的结果差异较小。通过三者综合数据,取压缩模量为5.26 MPa。该值用于地基沉降理论计算,结果与实际测量值较为接近,充分说明了压缩模量计算结果的可靠性。此外,研究表明,粉质黏土的液限、天然含水率及孔隙比与其压缩指数之间存在显著相关性。尽管通过这三个指标计算得到的压缩指数存在一定差异,但变化幅度相对较小,进一步验证了其计算结果的准确性。本研究旨在为类似工程提供参考依据。In order to accurately grasp the compression deformation characteristics of cohesive soil,the silty clay of a certain building project was taken as the research object.The compression modulus of the silty clay was cal-culated through a combination of static penetration test,indoor test,and lateral pressure test.The relationship functions between the liquid limit,natural moisture content,and porosity of the silty clay and its compression in-dex were constructed to achieve the calculation of the compression index of the silty clay.The analysis results show that the compression modulus range calculated by static penetration testing is 5.06 MPa~5.42 MPa,with an average value of 5.25 MPa;The compression modulus range calculated from indoor tests is 4.95 MPa~5.39 MPa,with an average value of 5.23 MPa;The compression modulus range calculated by the lateral pressure test is 5.08 MPa~5.51 MPa,with an average value of 5.29 MPa.The difference in the results of the three is relatively small.Based on the comprehensive data of the three,the compression modulus is taken as 5.26 MPa.This numerical value is used for theoretical calculation of foundation settlement,and the results are close to the actual measured values,fully demonstrating the reliability of the compression modulus calculation results.In addition,research has shown that there is a significant correlation between the liquid limit,natural moisture content,and porosity of silty clay and its compression index.Although there are some differences in the compression index calculated through these three indicators,the magnitude of the changes is relatively small,further verifying the accuracy of its calcu-lation results.This study aims to provide reference for similar projects.

关 键 词：粉质黏土 压缩模量 压缩指数 变化幅度 

分 类 号：TU41[建筑科学—岩土工程]