预防结构破坏的拼接路面交通组织优化

Traffic organization optimization on widening road for preventing structure damage

为防止路面拼接结构在施工过程中的二次破坏,文章基于接缝位置原路表面拉裂和路基塑性变形的数值仿真进行交通组织优化;分析了合宁高速公路路面拼接中的工况和病害,通过分别调整车辆荷载的大小、轮胎边缘距开挖断面距离和原有路面结构开挖时距拼接路基高差,依据拉应力和塑性应变指标确定合理的交通组织方式。车辆轴载和荷载距开挖断面距离是确定原有沥青面层表面是否会出现拉裂及道路路基开挖后是否会出现崩塌的重要条件,原有路基的开挖深度可以机动控制。根据2种病害综合临界条件曲线图能够快速确定合理的拼接路面交通组织方式。

To prevent secondary damage of widening road structure in construction process,the traffic organization optimization was implemented.The original road surface cracking and subgrade plastic deformation were simulated on the position of construction joint.The conditions and diseases in road widening of Hefei-Nanjing Expressway were analyzed.According to the values of tensile stress and plastic strain,optimal traffic organization was achieved by adjusting the values of vehicle loads,tire edge distance away from road excavation section and the height between original pavement surface and subgrade widening excavation.The vehicle load and the distance between vehicle load position and excavation section are two important factors which determine whether the surface cracking and subgrade collapse will occur.The original subgrade excavation depth can be flexibly controlled.A reasonable traffic organization mode on widening road can be quickly determined by the comprehensive critical condition graph of two kinds of diseases.