车辆动载作用下沥青路面孔隙水压力传播规律研究  

Study on the Propagation Rrule of Pore Water Pressure in Asphalt Pavement Structure Under Dynamic Load

作　　者：王振勇 WANG Zhenyong(Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou,Gansu 730030,China)

机构地区：[1]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730030

出　　处：《公路工程》2023年第6期124-129,137,共7页Highway Engineering

基　　金：甘肃省科技重点研发项目(22YF11GA302)。

摘　　要：针对车辆动载作用下沥青路面孔隙中自由水受迫产生的空隙水压力,基于水击理论,建立了水体弹簧模型,分析了正负孔隙水压力的形成机理;依据理论模型开发了孔隙水压力的测量方法,该方法模具制作简单,成本低廉,测量结果准确,传感器存活率高;通过该方法实地测量了不同车速下的孔隙水压力,实测数据表明孔隙水压力以正弦波的形式随时间变化,并在2~3个周期内迅速衰减至0,负压峰值小于正压峰值的1/4,车速越高,两者比值越小;对实测数据进行单指数拟合结果表明,正、负孔隙水压力峰值随车速增加的速率逐渐减小,并趋于稳定,正压峰值趋于556 kPa,负压峰值趋于-56 kPa。To analyze the propagation rule of pore water pressure in asphalt pavement structure,establishing water-spring model based on surge pressure wave theory(water hammer pressure wave);according to the theoretical model,the measurement method of pore water pressure is developed.This method is simple in mold making,low in cost,accurate measurement results and high sensor survival rate;according to the measurement method,we measures the pore water pressure at different speeds of the motor vehicle,and the measured data show that the pore water pressure changes with time in the form of a sine wave,and rapidly decay to 0 in 2 to 3 cycles,the peak negative pressure is less than the peak positive pressure of 1/4,and if the vehicle speed is higher,the ratio is smaller of them.Single exponential fitting of the measured data shows that the rate of the peak positive and negative pore water pressure gradually decreases and becomes stable,with the peak positive pressure tending to 556 kPa and the peak negative pressure reaching-56 kPa.

关 键 词：动载作用 孔隙水压力 形成机理 测量方法 实测数据 迅速衰减 指数关系 

分 类 号：U416.217[交通运输工程—道路与铁道工程]