既有铁路勘察评价与加固控制标准研究  

Research on Survey Evaluation and Reinforcement Control Standard for Existing Railway

作　　者：赵秀绍[1] 祝建农 代裕清 王亮亮[2] 耿大新[1] 刘巍[1] 

机构地区：[1]华东交通大学,南昌330013 [2]中铁上海设计院集团有限公司和建设指挥部,上海200070

出　　处：《铁道工程学报》2011年第3期11-15,共5页Journal of Railway Engineering Society

基　　金：国家自然科学基金(50908086);华东交通大学博士科研启动金资助项目(01306022)

摘　　要：研究目的:既有铁路经过多年运营后,需重新进行勘探评估,然后进行改造加固,以适应提速和电气化的需要。由于铁路规范缺乏数理统计方面的评价内容,对比了《建筑地基基础设计规范》和《公路工程质量检验评定标准》数理统计方法,并采用了填料分段、任务分段和强制分段三种方法对既有铁路进行了分段评估。研究结论:《公路工程质量检验评定标准》更适合既有铁路勘察指标的合理评价。以评价动态变形模量为例,结合铁路相关规范,提出了不需要加固改造段的动态变形模量最小值为40 MPa。分段法减小了加固长度,取得了较好的效果。根据数据统计与分段结果,Evd值与基床表层填料类型关系密切,A、B组填料在运营中难以保证较大的刚度,要获得较大的刚度,宜选用石灰改良土或水泥改良土。Research purposes：The existing railway must be evaluated in survey for reinforcement after operation for years to meet the requirements of the speed-raise and electrification.As there is no mathematical statistics method for survey evaluation on the existing railway,the filling materials segment method,task segment method and enforcement segment method are used for the evalution of the existing railway section by section after comparing the mathematical statistics method in ＂Code for Design of Building Foundations＂ and ＂Standards for highway Engineering Quality Inspection and Evaluation＂. Research conclusions：The ＂Standards for highway Engineering Quality Inspection and Evaluation＂ is more suitable for survey evaluation of the existing railway.Taking the evaluation of dynamic deformation modulus as an example,combined with the related standard of the railway,the minimum Evd control standard is 40 MPa which don＇t need reinforcement.The road sections length that need reinforcement are reduced when using segment evaluation method,achieving good effect.According to the statistics data and segment results,the Evd value has a close relationship with filling type on the surface of roadbed.It is difficult to ensure large stiffness when using A and B types filling,so lime or cement improved soil should be used to get larger stiffness.

关 键 词：既有铁路 分段评价 置信下限 代表值 控制标准 

分 类 号：U212.2[交通运输工程—道路与铁道工程]