基于足尺加速加载试验的地震波模量变化规律
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摘要
为了解沥青路面的模量衰变特性,基于行车荷载模拟系统(MLS66),在实际路面上进行了足尺加速加载试验;并使用便携式路面分析仪(PSPA),对试验区域的地震波模量进行了测量。试验结果表明:沥青路面的地震波模量与荷载作用次数的关系曲线呈现3个阶段(1模量-荷载作用次数呈线性关系;2出现加速衰减;3趋于稳定)。荷载的间歇作用有利于地震波模量的恢复,间歇时间越长,模量恢复百分比越高,但恢复速率降低。模量衰减不限于加速加载区域,对加速加载方向前、后的影响要大于两侧的。得出了沥青路面模量的衰变规律。在常温状态下,地震波模量与路面性能在荷载作用下具有一致性。
In order to study the modulus change,mobile load simulator system(MLS66)has been used to conduct full scale accelerated performance test and portable seismic pavement analyzer(PSPA)to test seismic modulus of actual asphalt pavement.The results show that three stages exist in changes of seismic modulus of asphalt pavement under loads.Firstly,the changes show liner relationship.Secondly,the decay rate of modulus becomes faster.Thirdly,the decay rate becomes close to zero.The intermittent time of loads has great effects on seismic modulus,the longer the intermittent,the greater the degree of the recovery of seismic modulus.But the recovery rate becomes lower.The attenuation area exceeds the region of the accelerated loading test,and the changes of front and rear is greater than sides.The decay regulation of seismic modulus of asphalt pavement is obtained,and the consistency can be found between seismic modulus and pavement performance.
In order to study the modulus change,mobile load simulator system(MLS66)has been used to conduct full scale accelerated performance test and portable seismic pavement analyzer(PSPA)to test seismic modulus of actual asphalt pavement.The results show that three stages exist in changes of seismic modulus of asphalt pavement under loads.Firstly,the changes show liner relationship.Secondly,the decay rate of modulus becomes faster.Thirdly,the decay rate becomes close to zero.The intermittent time of loads has great effects on seismic modulus,the longer the intermittent,the greater the degree of the recovery of seismic modulus.But the recovery rate becomes lower.The attenuation area exceeds the region of the accelerated loading test,and the changes of front and rear is greater than sides.The decay regulation of seismic modulus of asphalt pavement is obtained,and the consistency can be found between seismic modulus and pavement performance.
引文
[1]孙立军.沥青路面结构行为理论[M].上海:同济大学出版社,2013.(SUN Li-jun.Structural behavior study for asphalt pavement[M].Shanghai:Tongji University Press,2013.(in Chinese))
[2]Gucunski N,Maher A.Evaluation of seismic pavement analyzer for pavement condition monitoring[R].New Jersey:Department of Civil&Environmental Engineering at Rutgers University,2002.
[3]Baker M R,Grain K,Nazarian S.Determination of pavement thickness with a new ultrasonic device[R].EI Paso:University of Texas at EI Paso,1995.
[4]Nazarian S,Alvarado G.Impact of temperature gradient on the modulus of asphaltic concrete layers[J].Journal of Materials in Civil Engineering,2007,18(4):492-499.
[5]Nazarian S,Yuan D.Quality management of flexible pavement layers with seismic methods[R].EI Paso:University of Texas at EI Paso,2005.
[2]Gucunski N,Maher A.Evaluation of seismic pavement analyzer for pavement condition monitoring[R].New Jersey:Department of Civil&Environmental Engineering at Rutgers University,2002.
[3]Baker M R,Grain K,Nazarian S.Determination of pavement thickness with a new ultrasonic device[R].EI Paso:University of Texas at EI Paso,1995.
[4]Nazarian S,Alvarado G.Impact of temperature gradient on the modulus of asphaltic concrete layers[J].Journal of Materials in Civil Engineering,2007,18(4):492-499.
[5]Nazarian S,Yuan D.Quality management of flexible pavement layers with seismic methods[R].EI Paso:University of Texas at EI Paso,2005.
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