高速铁路CFG桩的终孔电流值与路基沉降相关性研究  

Research on Correlation between the Final Hole Current Value of CFG Piles and Subgrade Settlement in High-Speed Railway

作　　者：李成彦[1] 王会超 陈学军[1] LI Chengyan;WANG Huichao;CHEN Xuejun(Sinohydro Bureau 5 Co.,Ltd.,Chengdu Sichuan 610066)

机构地区：[1]中国水利水电第五工程局有限公司,四川成都610066

出　　处：《四川水力发电》2024年第S02期17-23,共7页Sichuan Hydropower

摘　　要：针对高速铁路(350 km/h)路基,行业内一般采用CFG桩复合地基进行处理。阐述了依托某站场路基CFG桩复合地基处理工程,通过对成桩电流值和沉降变形监测数据与钻进不同深度土层的电流值(持力层电流值)等参数,以及工后单桩承载力和路基沉降变形观测数据进行分析研究后,发现终孔电流值的取值对于桩底质量的影响较大,进而影响到复合地基的承载力。研究结果表明:CFG桩施工电流值的大小可以在一定程度上反映出地基处理的最终效果,对成桩质量具有重要影响,可以较大程度地提高成桩质量,有效提高桩基的单桩承载力,增强复合地基的承载能力,降低工后沉降。所取得的研究成果为高速铁路CFG桩的施工控制提供了理论依据和实践指导,为解决高速铁路建设中的地基沉降控制问题提供了有益的参考和借鉴。In the industry of high-speed railway(350Km/h)subgrade foundation,CFG pile composite foundation treatment is generally adopted.Based on the CFG pile composite foundation treatment project for a railway station,this article investigates the impact of the final hole current value on the pile bottom quality through analyzing the pile-forming current value records,settlement deformation monitoring data,current values of different soil layers(current value of the bearing stratum)during drilling,as well as the post-construction bearing capacity of single piles and subgrade settlement deformation observation data.The research finds that the value of the final hole current affects the quality of the pile bottom,thereby influencing the bearing capacity of the composite foundation.The results show that the magnitude of the CFG pile construction current value can reflect the final effect of foundation treatment to a certain extent,which has a significant impact on the pile quality.It can greatly improve the pile quality,effectively enhance the bearing capacity of the single pile foundation,strengthen the bearing capacity of the composite foundation,and reduce post-construction settlement.The research results provide theoretical basis and practical guidance for the construction control of CFG piles in high-speed railways,and serve as a useful reference for solving the problem of foundation settlement control in high-speed railway construction.

关 键 词：高速铁路 CFG桩基 终孔电流值 路基沉降 

分 类 号：U215[交通运输工程—道路与铁道工程] U215.1U215.7