饱和沥青路面动力流固耦合响应特性分析  

Characteristics Analysis of Dynamic Fluid-solid Coupling Response on Saturated Asphalt Pavement

作　　者：臧振宇 ZANG Zhenyu(Tianjin International Engineering Branch(Madagascar),China Railway 18th Bureau Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团天津国际工程分公司马达加斯加公司,天津300222

出　　处：《路基工程》2022年第2期157-161,共5页Subgrade Engineering

摘　　要：依托某典型高速公路饱和沥青路面,建立移动荷载下路面系统计算模型,考察行车速度、渗透系数、排水边界、模量等因素对水力响应的影响,分析饱和沥青路面水力损伤机制。结果表明:车辆荷载加载和卸载过程中饱和沥青路面动孔压表现为增长和消散发展模式,产生挤压和泵吸作用,孔隙水渗流过程中对面层产生循环拖拽和冲刷作用,在沥青面层深度0.05 m范围内容易出现水力损伤。动荷载产生的惯性作用、动孔压梯度形成渗流力产生的挤压和泵吸作用,以及孔隙水在流动过程中产生的拖拽和冲刷作用,是沥青路面产生水力损伤的内在机理。Based on the saturated asphalt pavement of a typical expressway, the system calculation model of saturated asphalt pavement under moving load was established to examine the driving speed, permeability coefficient, drainage boundary, modulus and other factors influencing the hydraulic response, and then to analyze the mechanism of hydraulic damage thereon. The results show that, in vehicle loading and unloading, the dynamic pore water pressure on saturated asphalt pavement is manifested as growth and dissipation development modes,leading to extruding and pumping effects, and during the seepage of pore water, there arise cyclic dragging and scouring effects on the surface layer, as a result, hydraulic damage is prone to appear in the range of 0.05 m deep in the surface layer. The inertia effect from live load, the extruding and pumping effects from seepage force caused by dynamic pore water pressure gradient, and the dragging and scouring effects from pore water flowing,are the internal mechanism of hydraulic damage arising on asphalt pavement.

关 键 词：饱和沥青路面 移动荷载 水力耦合 水力损伤 动孔压 

分 类 号：U214.3[交通运输工程—道路与铁道工程]