考虑传力杆位置偏差的刚性路面接缝传荷预估模型  

Joint Load-transfer Prediction Model of Rigid Pavement Considering Position Deviation of Dowel Bar

作　　者：高新文[1] 张艳聪[2] 高玲玲[3] 

机构地区：[1]长沙理工大学,湖南长沙410114 [2]山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006 [3]山西水利职业技术学院,山西运城044004

出　　处：《公路交通科技》2015年第3期57-62,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51308329);山西省自然科学基金项目(2013011027-1);山西省交通运输厅科技项目(2013-1-10)

摘　　要：针对刚性路面传力杆空间位置偏差问题,建立了Winkler地基上考虑层间接触状况的等平面尺寸双层路面结构模型,计算了传力杆位置偏差(水平偏角、竖直偏角和埋深偏差)对接缝传荷能力的影响,并通过三元非线性回归构建了接缝传荷能力预估模型,提出了模型的荷载修正系数η1并推荐了其取值范围。经FWD实测弯沉传荷系数的验证,修正后的预估模型较好地反映了位置偏差传力杆刚性路面的接缝传荷能力。传力杆水平偏角对弯沉传荷系数影响较小,随着竖直偏角的增大,传荷系数呈线性较小,水平偏离15°时,传荷系数降低约12%。传力杆布置于面层中部时,传荷能力最大,埋设位置偏上或偏下都将引起传荷系数的下降,偏下2 cm时降幅可达10%。To deal with the position deviation of dowel bar in rigid pavement,double-layer pavement structure model that area of surface and base is equal considering interlayer contact situation on Winkler foundation is established. The effect of position deviations, such as horizontal declination, vertical declination and embedded depth deviation,on joint load-transfer capacity is analyzed. The prediction model of joint loadtransfer capacity is established by ternary nonlinear regression,the load correction coefficient and its range are proposed too. After verification of measured data by FWD,the modified prediction model can well reflect the real load-transfer capacity of rigid pavement with position deviation dowel bar. The effect of dowel bar horizontal declination on the load-transfer coefficient is little. On the contrary,deflection load-transfer coefficient is almost linear decreased as its vertical declination increase,it reduces by approximately 12%when vertical declination is 15°. Meanwhile,the load-transfer capacity is maximum when dowel bar is embedded in middle of surface course. The load-transfer capacity would decline either position upwards or downwards. Especially,it would reduce by 10% when the position downwards 2 cm.

关 键 词：道路工程 预估模型 有限元 传荷能力 传力杆 位置偏差 

分 类 号：U416.2[交通运输工程—道路与铁道工程]