高速铁路中等压缩性土沉降试验研究  

Settlement Study on Medium Compressible Soil of High-Speed Railways

作　　者：王祥[1] 余雷 王亚威 罗强[3] 胡耀芳 WANG Xiang;YU Lei;WANG Yawei;LUO Qiang;HU Yaofang(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;China Railway Economic and Planning Research Institute Co.,Ltd.,Beijing 100038,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]中国铁路经济规划研究院有限公司,北京100038 [3]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2023年第7期30-35,共6页Railway Standard Design

基　　金：铁道部科技研究开发计划项目(2010G003-F);中铁第四勘察设计院集团有限公司科研课题(2010K29)。

摘　　要：中等压缩性土在我国分布极为广泛,是我国高速铁路路基的主要承载地层。面对毫米级工后沉降控制要求,研究中等压缩性土地基处理方式对高铁路基设计与建设具有重要意义。通过现场试验,分析了不同地基处理方式下高铁中等压缩性土地基沉降变形规律。研究结果表明,中等压缩性土地基沉降实测推算值明显小于理论计算值,为计算值的0.6~0.8倍;路基填筑完成时,中等压缩性土层沉降完成比例约为50%,预压9个月后,完成比例为90%~95%,若能保证1年以上的预压期,可不考虑其对工后沉降的影响;砂桩加固可加快填筑期间的沉降完成比例,但由于该层土沉降完成较快,不处理、部分处理、全部处理在预压9个月后三者沉降无明显差别。本文研究成果可指导高速铁路地基处理方案选择。Medium compressible soil is widely distributed in China and is the main bearing stratum of high-speed railway subgrade.Facing the requirements of millimeter level post construction settlement control,it is of great significance to study the treatment of medium compressible soil foundation for the design and construction of high-speed railway subgrade.Through field tests,this paper analyzes the settlement deformation law of medium compressible soil foundation of high-speed railway under different foundation treatment methods.The results show that the measured and calculated settlement of medium compressible soil foundation is significantly less than the theoretical calculation value,being 0.6~0.8 times of the calculated value;When the subgrade filling is completed,the settlement completion ratio of medium compressible soil layer is about 50%,after 9 months of preloading,the completion ratio reaches 90%~95%;If the preloading period is maintained over one year,the impact on post construction settlement can be ignored;Sand pile reinforcement can speed up the completion proportion of settlement during filling,but due to the rapid completion of settlement of this layer of soil,there is no significant difference in settlement after 9 months of preloading in the cases of none treatment,partial treatment and total treatment.The research results of this paper can guide the selection of foundation treatment schemes for high-speed railways.

关 键 词：高速铁路 铁路路基 地基处理 中等压缩性土 工后沉降 沉降试验 

分 类 号：U238[交通运输工程—道路与铁道工程] U213.1[建筑科学—岩土工程] TU413.6[建筑科学—土工工程]