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为了研究级配碎石基层在路面结构中能否发生剪切破坏,对级配碎石基层材料抗剪强度及在路面结构中的剪应力进行了对比研究;应用高精度静三轴仪对选定的级配碎石进行振动成型和击实成型的抗剪强度研究,揭示不同成型方法对抗剪强度的影响,采用有限元分析典型路面结构在标准荷载作用下剪应力的大小,明确级配碎石基层发生剪切破坏的可能性;三轴试验表明振动成型级配碎石过渡层的抗剪强度为0.17 MPa,击实成型的为0.14 MPa,振动成型试样比击实的抗剪强度提高20%;剪应力分析表明:水平荷载在级配碎石基层中产生的最大剪应力在0.04~0.05 MPa;级配碎石的抗剪强度是最大结构剪应力的3.5倍,级配碎石基层在高等级沥青路面结构中产生剪切破坏的可能性很小.
In order to study whether the graded macadam can shear failure in the pavement structure, the shear strength of the graded macadam base material and the shear stress in the pavement structure were compared. By using the precision static triaxial apparatus The research on the shear strength of certain graded macadam was carried out by vibration molding and compaction molding. The influence of different forming methods on the shear strength was revealed. The shear stress of typical pavement structure under standard load was analyzed by finite element method. The triaxial tests show that the shear strength of the vibration-forming graded macadam transition layer is 0.17 MPa and the compaction molding is 0.14 MPa. The vibration-molded specimens have higher specific shear strength Increase by 20%. The analysis of shear stress shows that the maximum shearing stress of horizontal load is 0.04-0.05 MPa. The shear strength of graded gravel is 3.5 times of the maximum structural shear stress. The graded gravel Grassroots in the high-grade asphalt pavement structure is unlikely to produce shear damage.