提速条件下兰新铁路乌奎段路基沉降整治技术  

Renovation Techniques of Subgrade Settlement in Wuxi-Kuitun Section of Lanzhou-Urumqi Railway Under Speed-raising Condition

作　　者：贾海锋 程佳 赵相卿 王兴 JIA Haifeng;CHENG Jia;ZHAO Xiangqing;WANG Xing(Northwest Research Institute Co.Ltd.of C.R.E.C,Lanzhou 730099,China;Qinghai Province Key Laboratory of Permafrost and Environmental Engineering,Golmud Qinghai 816099,China)

机构地区：[1]中铁西北科学研究院有限公司,兰州730099 [2]青海省冻土与环境工程重点实验室,青海格尔木816099

出　　处：《铁道建筑》2022年第7期138-141,共4页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划(2017G002-R);中国中铁新疆区域工程建设指挥部科技研发项目(2019002)。

摘　　要：针对兰新(兰州—乌鲁木齐)铁路乌奎段自提速以来路基沉降病害不断发展的问题,通过现场调查、现场试验、变形监测等方法,明确了兰新铁路乌奎段沉降病害分布特征及影响因素,提出了经济合理的整治技术。结果表明:兰新铁路乌奎段病害总长1 370 m,最大沉降150 mm,主要分布在路基高度大于1.5 m的地段、路涵过渡段;基于行车安全评价条件,将沉降病害分为不沉降、沉降、较严重沉降、严重沉降四类,兰新铁路乌奎段沉降病害均属于严重沉降,对线路运营安全影响极大;导致病害发生的因素包括路基承载力低、地基系数偏低、压实度不足,路基填料中的粉土、粉质黏土含水率高(高于塑限)以及火车提速动荷载增加;根据现场试验整治效果和经济性分析,在路基沉降病害整治中,宜采用注浆加固和旋喷桩等措施,不推荐采用侧限框架。In view of the continuous development of subgrade settlement diseases in Wuxi-Kuitun section of LanzhouUrumqi railway since the speed-raising,through on-site investigation,on-site test,deformation monitoring and other methods,the distribution characteristics and influencing factors of settlement diseases in Wuxi-Kuitun section were clarified,and economically reasonable remediation technologies were put forward. The results show that the total length of the disease in Wuxi-Kuitun section is 1 370 m,and the maximum settlement is 150 mm,which is mainly distributed in sections with subgrade height greater than 1.5 m and subgrade-culvert transition sections. Based on the traffic safety evaluation conditions,the settlement diseases can be classified into four categories:no settlement,settlement,relatively serious settlement and serious settlement. The settlement diseases of Wuxi-Kuitun section are all belong to serious settlement,which has a great impact on the line operation safety. The factors leading to the disease include low subgrade bearing capacity,low foundation coefficient,insufficient compactness,high moisture content of silt and silty clay in subgrade filler(higher than the plastic limit),the increment of dynamic load when the train speed-raising should also be considered. According to the field test and economic analysis,measures such as grouting reinforcement and jet grouting piles should be adopted in the renovation of subgrade subsidence diseases,and the use of lateral limiting frame is not recommended.

关 键 词：路基沉降 沉降等级划分 分布特征 成因分析 整治技术 

分 类 号：U213.14[交通运输工程—道路与铁道工程]