高速公路路基差异沉降标准  

Standard of differential settlement for highway subgrade

作　　者：闫强[1,2] 支喜兰[1] 刘保健[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]广西交通投资集团有限公司,广西南宁530021

出　　处：《长安大学学报（自然科学版）》2013年第2期16-21,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：中央高校基本科研业务费专项资金项目(CHD2009JC117)

摘　　要：为了合理确定高速公路路基差异沉降控制标准,应用有限元方法计算不同路基差异沉降下路面结构附加应力,并将计算结果与路面结构层材料极限抗拉强度对比,提出了基于防止路面破坏的路基容许差异沉降变化率计算式;基于水力水文学方法建立了公路路表集中排水模型,提出了基于路表排水的容许差异沉降变化率计算式;基于差异沉降对行车舒适性的影响,分析了人体对车辆垂直振动响应的敏感性,建立了国际平整度指数IRI与路基差异沉降的关系;综合以上因素,提出了高速公路路基差异沉降控制标准;最后以某高速公路为例应用本方法进行了计算。结果表明:仅考虑差异沉降对行车舒适性的影响时,以差异沉降变化率0.1%作为沉降控制标准;考虑路面结构破坏和排水时,应根据公路具体设计参数计算确定差异沉降变化率,这能更客观准确地表征路基差异沉降标准。In order to determine the control standard of highway subgrade differential settlement reasonably, finite element method was used to compute the additional stress in pavement struc- ture in the differential settlements. The results were compared with ultimate tensile strength of pavement structure layers, and the calculation formulas of the change rate of allowable differential settlement which would prevent pavement damage were presented. Based on the hydraulic and hydrological knowledge, the model of highway surface integrated drainage was established, and the calculation formulas of the change rate of allowable differential settlement which guaranteed drainage were also presented. Considering the effect of differential settlement on driving comfort, the response sensitivity of human body with vehicle vertical vibration was analyzed and the rela- tionship between International Roughness Index （IRI） and longitudinal differential settlement was established. Finally, the standard of highway subgrade differential settlement was proposed and a case study was presented in this paper. The results show that considering the effect of dif-ferential settlement on driving comfort, the change rate O. 1~ of differential settlement is taken as the control standard of differential settlement considering pavement damage and drainage, the change rate of differential settlement is suggested to be determined based on the reasonable spe- cific design parameters. 2 tabs, 4 figs, 14 refs.

关 键 词：道路工程 路基 沉降标准 有限元 差异沉降变化率 路表排水 

分 类 号：U418.6[交通运输工程—道路与铁道工程]