科技创新与应用2025，Vol.15Issue(30)：138-141,4.DOI:10.19981/j.CN23-1581/G3.2025.30.033
膨胀土的分类及判别标准研究
摘要
Abstract
Expansive soils(fissured clays)are prone to cause engineering diseases such as subgrade deformation and slope instability due to their characteristics of drying shrinkage and wet expansion.The current GB 50112-2013 Technical Code for Construction in Expansive Soil Regions in China mainly focuses on building foundations and does not fully cover the special requirements of railway engineering.Based on railway engineering practices,this paper proposes a classification system for expansive soils with the residual internal friction angle(φr),free swelling ratio(Fs),shear strength attenuation coefficient(α=(φf-φr)/φr),and unconfined compressive strength(qu)as the core indicators.In combination with the field geological characteristics(such as fissure development,disintegration,etc.),a two-stage discrimination process of preliminary judgment(qualitative)and detailed judgment(quantitative)is established.Through the data analysis of 11 typical railway construction sites,it is verified that this classification method can significantly improve the evaluation accuracy of subgrade slope stability and reduce the project rework rate by more than 30%.关键词
膨胀土/判别标准/残余内摩擦角/自由膨胀率/无侧限抗压强度Key words
expansive soil/criterion/residual internal friction angle/free expansion rate/unconfined compressive strength分类
建筑与水利引用本文复制引用
金凤飞,唐梅艳,沈朝政,苗学云..膨胀土的分类及判别标准研究[J].科技创新与应用,2025,15(30):138-141,4.基金项目
中国铁路青藏集团有限公司科技研究开发计划项目(QZ2023G01) （QZ2023G01）
中铁西北科学研究院有限公司自主创新项目(2022XBK03、2023XBK03) （2022XBK03、2023XBK03）
