膨胀土地区修建高速公路路基填料改良及效果研究  

Study on improvement and effect of constructing highway subgrade filler in expansive soil area

作　　者：周晶晶 席志飞 ZHOU Jing-jing;XI Zhi-fei(CCCC Fourth Navigation Engineering Survey&Design Institute Co.,Ltd.,Guangzhou,Guangdong 510000,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司,广东广州510000

出　　处：《黑龙江交通科技》2019年第2期4-6,9,共4页Communications Science and Technology Heilongjiang

摘　　要：膨胀土具有吸水膨胀与干燥开裂等性质,不宜直接用作路基填料。考虑膨胀土工程特性的区域性以及工程项目的独特性,工程实践中膨胀土用作路基填料时的改良措施存在差异,如何评估改良膨胀土填料的实际工程应用效果一直是工程界面临的重要课题之一。依托膨胀土地区某高速公路路基工程背景,借助室内土工试验、数值模拟等方法,系统探究了膨胀土基本物理力学特性、不同掺量石灰外加剂作用下膨胀土工程性质变化特征、改良膨胀土用作路基填料后的长期承载性能。研究成果能够为改良膨胀土在高速公路路基中的应用提供理论参考。Expansive soil has the characteristics of water swelling and dry cracking,and should not be directly used as roadbed filler.Considering the regional characteristics of the expansive soil engineering characteristics and the uniqueness of the engineering project,there are differences in the improvement measures when the expansive soil is used as the roadbed filler in engineering practice.How to evaluate the actual engineering application effect of the improved expansive soil filler has always been an important issue facing the engineering community.Therefore,based on the background of a highway subgrade in expansive soil area,this paper systematically explores the basic physical and mechanical properties of expansive soil and the engineering characteristics of expansive soil under different loadings of lime admixture by means of indoor geotechnical test and numerical simulation.The long-term bearing capacity of expansive soil after it is used as a roadbed filler.The research results can provide a theoretical reference for improving the application of expansive soil in highway subgrade.

关 键 词：改良膨胀土填料 土工试验 数值模拟 

分 类 号：U416.1[交通运输工程—道路与铁道工程]