高速铁路地基土压缩性分类及中低压缩性土变形特性研究  

Research on the compressible Classification of High-speed Railway Foundation Soil and Deformation Characteristics of Medium-Low Compressible Soil

作　　者：余雷 崔俊杰 YU Lei;CUI Junjie(China Railway Economic and Planning Research Institute Co.,Ltd.,Beijing 100038,China;China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]中国铁路经济规划研究院有限公司,北京100038 [2]中铁工程设计咨询集团有限公司,北京100055

出　　处：《铁道标准设计》2023年第7期7-11,56,共6页Railway Standard Design

基　　金：中国国家铁路集团有限公司科技研究计划重大课题(2019G006-A-1);铁道部科技研究开发计划项目(2010G003-F)

摘　　要：地基土压缩变形特性是影响高速铁路路基设计、施工、沉降评估等环节的重要因素。为进一步充分利用高速铁路地基土自身的承载变形能力,降低工程投资,通过开展综合勘察、土工试验及现场填筑试验等,提出基于变形控制为目的的高速铁路地基土分类标准,即高压缩性土、中高压缩性土、中低压缩性土及低压缩性土;并详细分析了各类地基土的物理力学指标。针对目前尚未充分利用的中低压缩性土,从室内试验压缩特性及现场填筑试验压缩性等角度分析了高铁路基荷载下,中低压缩性土地基承载变形快速收敛的特性。研究结果表明,在经过适当处理后,中低压缩性土变形可以满足高铁路基工程的要求。因此,将既有规范中中等压缩性土进一步细分为中低压缩性土和中高压缩性土,有利于优化高速铁路路基结构设计,为降低工程成本提供依据。The compression deformation characteristics of foundation soil are an important factor affecting the design,construction and settlement evaluation of high-speed railway subgrade.In order to further make full use of the bearing deformation capacity of high-speed railway foundation soil and reduce project investment,the deformation-control-targeted classification standard of high-speed railway foundation soil is proposed based on comprehensive investigation,geotechnical test and field filling test,including high compressible soil,medium-high compressible soil,medium-low compressible soil and low compressible soil.And the physical and mechanical indexes of various foundation soils are analyzed in detail.Aiming at the medium-low compressible soil that has not been fully used at present,the characteristics of rapid convergence of bearing deformation of medium-low compressible soil foundation under high-speed railway subgrade load are analyzed from the aspects of indoor test compression characteristics and field filling test compression characteristics.The results show that after proper treatment,the deformation of medium-low compressible soil can meet the requirements of high-speed railway subgrade engineering.Therefore,further subdividing the medium compressible soil in the existing specifications into medium-low compressible soil and medium-high compressible soil is conducive to optimizing the subgrade structure design of high-speed railway and providing a basis for reducing the project cost.

关 键 词：高速铁路 铁路路基 压缩性分类 压缩系数 中低压缩性土 变形特性 

分 类 号：U238[交通运输工程—道路与铁道工程] U213.1