普速铁路加筋膨胀土路堤填筑与现场监测研究  

Study on filling and field monitoring of reinforced expansive soilembankment of general speed railway

作　　者：刘妮娜 LIU Ni´na(Guangzhou Engineering Co.,Ltd.,China Railway 19th Bureau Group,Guangzhou 511466,China)

机构地区：[1]中铁十九局集团广州工程有限公司,广东广州511466

出　　处：《长沙理工大学学报（自然科学版）》2023年第6期27-38,共12页Journal of Changsha University of Science and Technology:Natural Science

基　　金：中国铁路南宁局集团有限公司科技研究开发计划项目(建21-4)。

摘　　要：【目的】合理利用膨胀土作为普速铁路路堤填料,验证膨胀土直接用于路堤非动力区的可行性。【方法】通过室内击实试验和有荷膨胀试验获取了膨胀土的路用特性及膨胀性相关参数,并基于平衡含水率理论计算膨胀土路堤在运营期的竖向变形量,据此提出膨胀土的压实控制标准。为防止边坡发生浅层破坏,提出了对膨胀土路堤边坡进行土工格栅加筋处理的填筑方案,并在现场修筑试验段埋设监测元件开展现场监测,以验证该填筑方案的可行性。【结果】膨胀土填筑时应根据其湿法击实曲线中93%最大干密度所对应的湿侧含水率作为压实控制含水率;土工格栅加筋处置方案不仅可以利用格栅的弹性变形来释放膨胀土增湿产生的部分膨胀力,同时也可以约束膨胀土的湿胀变形,从而确保边坡的稳定;在接近一年的运营后,路堤沉降量基本稳定在37.0 mm左右,满足规范要求。【结论】本研究可为普速铁路膨胀土路堤填筑提供参考,以促进铁路行业的科技进步。[Purposes]The study aims to rational use of make expansive soil as embankment filler of general-speed railway,and verify the feasibility of using expansive soil dircetly in the non-dynamic area of embankment.[Methods]The road performance and swelling parameters of expansive soil were obtained through laboratory compaction and swelling tests,the vertical deformation of expansive soil embankment during operation was calculated based on the equilibrium moisture content theory,and the compaction control standard for expansive soil was put forward accordingly.Furthermore,a filling scheme of geogrid reinforcement treatment was proposed for preventing the shallow damage of the slope for the embankment slop,and the testing section buried with monitoring devices was built,the feasibility of the expansive soil filling scheme was verified through field monitoring.[Findings]When filling expansive soil,the compaction control moisture content should be taken as the wet side moisture content corresponding to 93%of the maximum dry density in its wet compaction curve.The geogrid reinforcement scheme can not only use the elastic deformation of the geogrid to release partial swelling pressure generated by the humidification of expansive soil,but also restrain the swelling deformation of expansive soil,thus ensuring the stability of the slope.After nearly one year´s operation,the embankment settlement value is basically stable at about 37.0 mm,which meets the requirements of the specification.[Conclusions]This paper can provide a reference for expansive soil embankment filling of general-speed railway in expansive soil area,and promote the scientific and technological progress of railway industry.

关 键 词：铁路工程 膨胀土路堤 土工格栅加筋 压实控制含水率 现场监测 

分 类 号：TU43[建筑科学—岩土工程]