沥青路面结构层间加筋性能试验研究

Experimental research on mechanical properties of pavement layer interface with reinforced materials

为了研究钢丝加筋网在沥青路面结构层间的力学性能,探讨钢丝加筋网的行为机理,选择3种不同规格的钢丝加筋网、玻纤格栅和自粘式应力布共5种材料,通过车辙试验和层间剪切试验,研究不同加筋材料路面结构组合试件的抗车辙性能和层间抗剪切性能。通过3种规格钢丝网试件的拉拔试验,研究钢丝网在路面结构层间的锚固性能。研究结果表明:钢丝加筋网、玻纤格栅、自粘式应力布对于提高结构抗车辙能力都有积极的影响,钢丝加筋网因其“平面限制效应”,与集料有更强的嵌锁作用,抗车辙能力有显著改善;钢丝网与集料间的嵌锁导致钢丝网具有良好的“被动抗剪”作用,能改善结构层间抗剪能力,自黏式应力布和玻纤格栅因层间接触面的隔离作用,对界面抗剪强度有不利影响;Ω型加强钢丝的抗拉拔能力和锚固稳定性比直丝型钢丝大大提高,增大加强钢丝直径也能提升Ω型钢丝网的层间锚固性能;因Ω型钢丝网受力变形后,提高了钢丝与层间材料之间的摩阻力和Ω型驼峰的“端部承压”作用,Ω型驼峰能显著提高钢丝网在路面结构层间的锚固性能。

Five different types of reinforced materials such as three different sizes of steel wire mesh, fiberglass grid, and self-adhesive geotextile were selected for experiments to study the mechanical properties of pavement layer interface with steel wire mesh and explore the reinforcement mechanism. The rutting resistance and interlayer shear resistance of composite specimens reinforced with different materials were studied using the rutting tests and interlayer shear tests, and the anchoring performance of steel wire mesh between pavement structural layers was studied using the pull-out tests. The results show that steel wire mesh, fiberglass grid, and self-adhesive geotextile have a positive effect on improving the rutting resistance of composite specimens. The anti-rutting ability of composite specimens reinforced with steel wire mesh was significantly improved due to the stronger interlocking effect with the aggregates and the “plane confinement effect”. The steel wire mesh improves the shear resistance of composite specimens due to the satisfactory “passive shear” effect from the interlocking effect between steel wire mesh and aggregates. The self-adhesive geotextile and fiberglass grid have an adverse effect on the interlayer shear strength due to the isolation of the pavement layer interface. The pull-out resistance and anchoring stability of reinforced Ω-type steel wire are greatly improved as compared to straight wires, and the increased diameter of reinforced steel wire could also improve the anchoring performance of Ω-type steel wire mesh. The Ω-type hump could significantly enhance the anchoring performance of steel wire mesh between structural layers as a result of an increase in the frictional resistance between steel wire and interlayer aggregate and the “end bearing” effect of Ω-type hump after the deformation of the Ω-type mesh.