层间结合状态对贫水泥混凝土基层路面力学响应影响研究

Research on the Effect of Layer Bonding State on the Mechanical Response of Lean Cement Concrete Base Pavement

文中利用有限元软件建立三维路面结构模型,定义了不同层间结合系数,对路面模型施加标准轴载并进行应力、应变分析.结果表明:①随着层间结合系数的增加,面层层底水平拉应力及剪应力大幅下降;基层层底水平拉应力总体增大,剪应力减小;土基顶部竖向变形降低;②层间结合系数增至6.0后,应力、应变达到稳定状态,层间结合状态近似完全连续;③随着层间结合程度的增强,基层模量的增大对面层层底和基层层底受力产生有利影响.在实际工程中,可在贫水泥混凝土基层初凝前直接浇筑混凝土板,使面-基层间达到最好的结合状态,从而延长路面使用寿命.

The three-dimensional pavement structure model was established by finite element software,and different interlayer bonding coefficients were defined.The standard axle load was applied to the pavement model,and the stress and strain were analyzed.The results show that:(1)With the increase of interlayer bonding coefficient,the horizontal tensile stress and shear stress at the bottom of the surface layer decrease greatly.Generally,the horizontal tensile stress at the base level increases,the shear stress decreases,and the vertical deformation at the top of the soil foundation decreases.(2)After the interlaminar bonding coefficient increased to 6.0,the stress and strain reached a stable state,and the interlaminar bonding state was approximately completely continuous.(3)With the enhancement of interlayer bonding degree,the increase of base modulus has a favorable influence on the stress of the base layer and the base layer.In practical projects,concrete slabs can be poured directly before the initial setting of the lean cement concrete base,so as to achieve the best bonding state between the surface and the base,thus prolonging the service life of the pavement.