废弃橡胶轮胎在路桥过渡段沉降影响因素研究

Study on influencing factors of settlement of waste rubber tires in transition section of road and bridge

为了研究废弃橡胶轮胎作为路基的加筋材料改善道路桥梁过渡段差异沉降的影响因素,建立了ABAQUS有限元数值模型。通过施加单一与交通荷载,对不同加筋层数、筋材特性、交通荷载的幅值、频率、循环次数等因素对土体沉降量的影响进行分析。结果表明,3层加筋效果优于2层,远优于1层。加筋后的桥头路基抵抗沉降的能力有显著提高,且随着模量的提高,效果更明显。在交通荷载作用下,随深度的增加,轮胎的影响深度逐渐减小;随荷载频率的增大,交通荷载作用在土层的次数增加,荷载的影响深度随之增大;随循环次数的增加,土体塑性位移递增。轮胎通过将软土层分层,提高了土体的整体性和连续性,减小了差异性沉降,使路桥的过渡段平稳过渡。

To study the influencing factors of using waste rubber tires as reinforcement materials for roadbed to improve differential settlement in road bridge transition sections,ABAQUS finite element numerical model was established.By applying a single and traffic load,the impact of different reinforcement layers,reinforcement properties,amplitude,frequency,and number of cycles of traffic load on soil settlement was analyzed.The results show that the reinforcement effect of three layers is better than that of two layers,which is much better than that of one layer.The settlement of the reinforced bridgehead roadbed significantly improves its ability to resist settlement,and the effect becomes more pronounced with the increase of modulus.Under the influence of traffic loads,the depth of tire influence gradually decreases as the depth increases.As the frequency of the load increases,the number of times it acts on the soil layer increases,and the depth of the load s influence increases accordingly.As the number of cycles increases,the plastic displacement of the soil increases.The results indicate that by layering the soft soil layer,the tires improve the integrity and continuity of the soil,reduce differential settlement,and make the transition between the road and bridge smooth.