摘要
为了确定RoadMesh钢丝网加筋新老路面结合部的合理层间设置位置,以抵抗由拓宽路基差异沉降引起的沥青路面上部反弯破坏作用,依托实际老路拓宽工程,选取沥青面层之间(方案一)、基面层之间(方案二)和基层之间(方案三)3种层间加筋方案,设定新路肩外缘下方新路基表面产生10 mm最大差异沉降脱空值,通过相应的三维有限元建模和数值模拟,对比分析了RoadMesh钢丝网加筋前后及不同层间加筋方案拓宽沥青路面结构的力学响应。研究结果显示:结合部附近的路表最大拉应力峰值和双轮轮隙中心路表弯沉值可作为拓宽沥青路面结构抗拓宽路基差异沉降的主要控制指标,各方案下二者模拟结果的排序均为方案一<方案二<方案三<未加筋,其中方案一的两个指标比未加筋方案的分别降低了53.4%和60.6%。表明在新老路面结合部用RoadMesh钢丝网加筋能够显著提高拓宽沥青路面结构的抗拓宽路基差异沉降的能力,且加筋层间越靠近路表,其抗反弯破坏作用的加筋效果越显著,因此面层之间为最佳加筋层间,基面层之间为适宜的加筋层间。研究结果可供拓宽沥青路面加筋设计参考。
In order to determine the reasonable interlayer setting position of joint between new and old pavement reinforced by RoadMesh steel wire mesh to resist the reverse bending failure effect of the top of asphalt pavement caused by differential settlement of widening subgrade,relying on the real old road widening project,three interlayer reinforcement schemes were selected such as between asphalt surface layers(scheme 1),between surface layer and base layer(scheme 2)and between base layers(scheme 3).The 10 mm maximum void value of differential settlement was set at the surface of new subgrade under the outer edge of new shoulder.Through the corresponding 3D finite element modeling and numerical simulation,the comparative analysis of mechanical response of widening asphalt pavement structure was carried out before and after the RoadMesh steel wire mesh reinforcement and for the different interlayer reinforcement schemes.The results show that the peak value of the maximum tensile stress of pavement surface near the joint and the pavement surface deflection value of double wheel clearance center can be used as the main control indexes of widening asphalt pavement structure for resisting differential settlement of widening subgrade.The order of simulation results for the two indexes under each scheme is scheme 1<scheme 2<scheme 3<unreinforced scheme,and the two indexes of scheme 1 are 53.4%and 60.6%lower than those of the unreinforced scheme,respectively,which indicates that the joint between new and old pavement reinforced by the RoadMesh steel wire mesh can significantly improve the ability of widening asphalt pavement structure to resist differential settlement of widening subgrade.The closer the reinforced interlayer is to the pavement surface,the more significant the reinforcement effect for resisting reverse bending failure effect is.Therefore,the optimum reinforcement interlayer is between surface layers,and the suitable reinforcement interlayer is between surface layer and base layer.The results can provide refer
作者
祝建华
吕茂丰
查旭东
刘浩军
ZHU Jian-hua;LYU Mao-feng;ZHA Xu-dong;LIU Hao-jun(Quzhou Highway,Port and Fairway Transportation Management Center,Quzhou 324000,China;Railway Group 5 Mechanization of Engineering Limited Liability Company,Changsha 410100,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)
出处
《长沙理工大学学报（自然科学版）》
CAS
2021年第4期1-8,共8页
Journal of Changsha University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(51878077)
浙江省交通运输厅科技计划项目(2010H33)
中铁五局集团有限公司科技项目(2020[12])。
关键词
钢丝网
路面加筋
新老路面结合部
拓宽路基
差异沉降
数值模拟
反弯破坏作用
steel wire mesh
pavement reinforcement
joint between new and old pavement
widening subgrade
differential settlement
numerical simulation
reverse bending failure effect
