公路拓宽新旧路新型联接结构及其应用技术研究

发布时间：2018-06-09 15:02

本文选题：应力吸收带 + 加宽扩建　；参考：《河北工业大学》2014年硕士论文

【摘要】：在旧路加宽扩建项目中，新旧路的结合部位往往是施工难点，也是受力薄弱点。由于新旧路基、基层的稳定性、强度、刚度、密实度、固结程度等不同，在车辆荷载作用下，势必引起横向不均匀沉降，从而导致路面开裂破坏。传统做法是在旧路一端采用开台阶做法，加强新旧路的结合，但还是半刚性基层直接相接，新旧路面结构由于材料性能不同，在荷载作用下引起的不均匀变形无法消除，扩建路面在新旧结合部位破坏不可避免。沥青碎石应力吸收带，在新旧路面相接处，摊铺沥青碎石带，沥青碎石混合料中大粒径集料多，沥青含量少，空隙率大，这种多孔隙结构有效地阻断新旧路面裂缝扩展路径，消弱拉应变和拉应力地传递能力，消散和吸收由交通荷载及环境温度变化所产生的荷载应力和温度应力，沥青碎石混合料收缩系数较小，具有较大的塑性变形能力，充分吸收接缝释放的应变能，减小接缝处的应力集中现象，，延缓反射裂缝向上扩展的速度。
[Abstract]:In the old road widening and expansion project , the joint part of the new and old road is often the construction difficulty and the weak point of stress . Due to the difference of stability , strength , rigidity , compactness and consolidation degree of the new and old roadbed and base course , it is necessary to cause lateral non - uniform settlement under the action of vehicle load , so as to strengthen the combination of the new and old road , but it is still directly connected with the semi - rigid base course .

The asphalt crushed stone stress absorbing belt is paved on the new and old road surfaces , and the asphalt crushed stone belt is paved . The asphalt crushed stone mixture has the advantages of large aggregate of large - size aggregates , low asphalt content and large void ratio , effectively block the crack propagation path of the new and old pavement , weaken the tensile strain and the tensile stress , effectively block the load stress and the temperature stress caused by the change of the traffic load and the ambient temperature , reduce the stress concentration phenomenon at the joint , reduce the stress concentration phenomenon at the joint , and delay the upward expansion of the reflection crack .
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U418.8

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