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纤维增强复合材料加筋路面碎石层荷载分散效果分析

Load distribution performance of fiber reinforced polymer reinforced pavement crushed stone layer

  • 摘要: 为改善碎石层层间接触状态,提升其稳定性及荷载分散效果,本文利用纤维增强复合材料格室加筋碎石层。以倒装式路面结构为例,本文基于弹性层状体系理论对格室进行设计,并通过室内承载板试验与有限差分法(finite difference method, FDM)和离散元(discrete element method, DEM)耦合数值模拟相结合的方法分析加筋前后碎石层的荷载分散效果。研究表明,所设计的格室满足稳定性变形要求;与未加筋碎石层相比,加筋碎石层回弹模量和变形模量均得到提高,塑性变形降低;荷载传递系数平均值低于未加筋碎石层,大于平均接触力的强力链扩散范围最高提升至2倍,各向异性程度低于未加筋碎石层,荷载分散效果得到极大改善。

     

    Abstract: To improve the contact state between layers of crushed stones and enhance their stability and load dispersion effect, this paper employs fiber-reinforced composite material cells to reinforce crushed stone layers. Taking an inverted pavement structure as an example, the cells are designed based on the elastic layered system theory. The load dispersion effect of the crushed stone layers before and after reinforcement is analyzed through a combination of indoor bearing plate tests and a coupled finite difference method (FDM) and discrete element method (DEM) numerical simulation. The results show that the designed cells meet the stability and deformation requirements. Compared with the unreinforced crushed stone layer, the reinforced layer exhibites increased elastic and deformation modulus, as well as reduced plastic deformation. The average load transfer coefficient is lower than that of the unreinforced layer, and the diffusion range of the strength chain with the highest power is doubled. Additionally, the degree of anisotropy is lower than that of the unreinforced layer, indicating a significant improvement in the load dispersion effect.

     

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