加速加载条件下双层排水路面性能演变规律

Performance Evolution Law of Double-Layer Drainage Pavement under Accelerated Loading Conditions

摘要:

为研究排水路面性能，设计了两种双层排水路面结构（OGFC-10+OGFC-13 与 OGFC-13+OGFC-20），系统研究了其在不同温度加速加载条件下的抗滑性能、排水性能、车辙发展及细观结构演变规律。结果表明：单层 OGFC-13 与两种双层排水路面结构（OGFC-10+OGFC-13、OGFC-13+OGFC-20）在加载初期（0～3万次）抗滑性能与渗透系数均迅速衰减，随后趋于稳定；双层结构（OGFC-13+OGFC-20）表现出最优的综合性能，其抗滑性能、抗车辙能力与排水能力均优于单层及其他双层结构；细观CT分析进一步揭示了混合料内部空隙的演变机制，包括压密、蠕变与局部破坏三阶段。

Abstract:

To study the performance of permeable pavement, two types of double-layer permeable pavement structure (OGFC-10+OGFC-13 and OGFC-13+OGFC-20) are designed, and the skid resistance, drainage performance, rutting development and meso-structural evolution law of the both are systematically studied under the different temperature accelerated loading conditions. The results indicate that the skid resistance and permeability coefficient of single-layer OGFC-13 and the two double-layer (OGFC-10+OGFC-13 and OGFC-13+OGFC-20) permeable pavement structures decay rapidly during the initial loading stage (0-30,000 cycles), and then stabilizing. The double-layer structure (OGFC-13+OGFC-20) demonstrates the best overall performance, and its skid resistance, rutting resistance and drainage capacity are better than the single-layer and other double-layer structures. The meso-CT analysis further reveals the evolution mechanism of internal voids in the mixture, including three stages of compaction, creep and localized failure.