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以石家庄至磁县公路改扩建路面拼接方案为例,采用有限元分析技术,探讨新旧路面台阶状拼接与设置应力吸收带拼接两种方案的受力特性。结果表明:对于设置应力吸收带面层结构,2种条件下均呈现面层拉应力降低,但压应力增大。对于设置应力吸收带基层结构,差异沉降条件使设置应力吸收带的基层拉应力降低,但压应力增大;而汽车荷载条件使设置应力吸收带的基层拉应力有所增加,但压应力降低。差异沉降条件对基层拉应力减少幅度远大于汽车荷载条件,综合2种条件下基层拉应力总体上减少。考虑到沥青路面结构破坏主要受控于基层拉应力,因此,设置应力吸收带比不设置应力吸收带的拼接路面拥有更好的受力性能。
Taking Shijiazhuang-Cixi highway reconstruction and expansion project as an example, the finite element analysis technology is used to investigate the force characteristics of both the old and new pavement steps and splicing of stress absorption zone. The results show that under the two conditions, the tensile stress decreases and the compressive stress increases. For the structure of stress absorption zone, the differential settlement conditions reduce the tensile stress of the base layer where the stress absorption zone is set, but the compressive stress increases. However, the vehicle tensile stress increases the tensile stress of the base layer where the stress absorption zone is set, but the compressive stress decreases. Under the condition of differential settlement, the reduction of tensile stress to the basement is much larger than that of the vehicle. Under the two conditions, the tensile stress of the basement decreases overall. Considering that the destruction of asphalt pavement structure is mainly controlled by the primary tensile stress, setting the stress absorption zone has better stress performance than the splicing road without the stress absorption zone.