土工格栅加筋柔性路面力学行为的数值模拟

软弱路基上的粒料基层柔性路面,在交通荷载的反复作用下,会产生过量的塑性累积变形。置于基层和土基间的土工格栅,通过接触面摩阻力对基层和土基施加侧向约束,抑制基层塑性变形发展,改善土基表面应力分布。该文应用有限元法分析一土工格栅加筋模型的力学行为,并探讨基层厚度、土基回弹模量、基层-土基回弹模量比、格栅拉伸模量对加筋效果的影响。分析表明:加筋效果同基层厚度、土基回弹模量、基层-土基模量比、筋材拉伸模量密切相关;低模量筋材加筋、基层较厚时,加筋效果明显降低。

Numerical Modeling for Mechanical Behavior of Geogrid-reinforced Flexible Pavement

Severe plastic accumulative deformation will take place under the repeated traffic load on the aggregate base flexible pavement on soft subgrade.The geogrid between base and subgrade enforces lateral restraint to base and subgrade by interface contact frictional force,which will inhibit the development of base plastic deformation,and improve the vertical stress distribution on subgrade surface.The mechanical behavior of a geogrid-reinforced pavement model was analyzed by FEM in this paper.The influence of base thickness,subgrade resilient modulus,modulus ratio of base to subgrade and geogrid tensile modulus on the effect of reinforcement are also discussed.The results indicate that the effect of reinforcement are closely correlated with base thickness,subgrade resilient modulus,modulus ratio of base to subgrade and geogrid tensile modulus.When low modulus geogrid was used and the base was thick,the reinforced effect would decrease explicitly.