山东交通学院学报
山東交通學院學報
산동교통학원학보
JOURNAL OF SHANDONG JIAOTONG UNIVERSITY
2014年
3期
55-61
,共7页
沥青路面%半刚性基层%APT%动力响应%落锤式弯沉
瀝青路麵%半剛性基層%APT%動力響應%落錘式彎沉
력청로면%반강성기층%APT%동력향응%락추식만침
asphalt pavement%semi-rigid base%APT%dynamic response%falling weight deflection
通过足尺试验路加速加载试验研究半刚性基层沥青路面的动力响应，为路面性能预估及结构设计提供依据。通过修筑水泥稳定碎石基层和二灰稳定碎石基层2种结构APT试验路，埋设水平应变仪、竖向压应力传感器和温度传感器，实时采集路面结构动应力、应变、弯沉和路面温度场，分析温度与结构动应变、应力响应的关系，开展基于FWD弯沉盆的路面结构层模量和力学响应计算分析。研究结果表明，半刚性基层层底拉应变受温度影响较小，半刚性基层厚度对结构弯沉影响较大；半刚性基层厚度越小，其模量衰减越快；随重复荷载作用，半刚性基层层底拉应变响应先较快增加而后缓慢减小；在路面使用初期（＜2560万次标准轴载），半刚性基层结构模量衰减较慢，当轮载作用1亿次标准轴载累计当量轴次时，半刚性基层模量约衰减55％。
通過足呎試驗路加速加載試驗研究半剛性基層瀝青路麵的動力響應，為路麵性能預估及結構設計提供依據。通過脩築水泥穩定碎石基層和二灰穩定碎石基層2種結構APT試驗路，埋設水平應變儀、豎嚮壓應力傳感器和溫度傳感器，實時採集路麵結構動應力、應變、彎沉和路麵溫度場，分析溫度與結構動應變、應力響應的關繫，開展基于FWD彎沉盆的路麵結構層模量和力學響應計算分析。研究結果錶明，半剛性基層層底拉應變受溫度影響較小，半剛性基層厚度對結構彎沉影響較大；半剛性基層厚度越小，其模量衰減越快；隨重複荷載作用，半剛性基層層底拉應變響應先較快增加而後緩慢減小；在路麵使用初期（＜2560萬次標準軸載），半剛性基層結構模量衰減較慢，噹輪載作用1億次標準軸載纍計噹量軸次時，半剛性基層模量約衰減55％。
통과족척시험로가속가재시험연구반강성기층력청로면적동력향응，위로면성능예고급결구설계제공의거。통과수축수니은정쇄석기층화이회은정쇄석기층2충결구APT시험로，매설수평응변의、수향압응력전감기화온도전감기，실시채집로면결구동응력、응변、만침화로면온도장，분석온도여결구동응변、응력향응적관계，개전기우FWD만침분적로면결구층모량화역학향응계산분석。연구결과표명，반강성기층층저랍응변수온도영향교소，반강성기층후도대결구만침영향교대；반강성기층후도월소，기모량쇠감월쾌；수중복하재작용，반강성기층층저랍응변향응선교쾌증가이후완만감소；재로면사용초기（＜2560만차표준축재），반강성기층결구모량쇠감교만，당륜재작용1억차표준축재루계당량축차시，반강성기층모량약쇠감55％。
In this article, the dynamic response of the semi-rigid asphalt pavement is studied through the acceleration and loading test on the full-scale test road , which provides the basis for the prediction and structural design of pavement performance .Through the APT test road construction with the two structures of cement stabilized macadam and lime-fly ash stabilized macadam , strain gauges , vertical stress sensors and temperature sensors are laid to make the real-time collection of the dynamic stress , strain and deflection of the pavement structure as well as the pavement temperature field , to analyze the correlation between the temperature and the responses of the structural dynamic strain and stress and also the calculation of the pavement layer moduli and mechanical response based on the FWD deflection basin .The research results are as follows .The tensile strain of semi-rigid base layer is less affected by temperature .The structural deflection is greatly affected by the thickness of the semi-rigid base .The thinner the semi-rigid base thickness is , the faster the decline of its modulus is .With the function of repeated loads , the declining rate of tensile strain of semi-rigid base layer increases first and then slowly decreases .In the early service ( less than 25 .6 million times of standard axle loads) , the modulus of the semi-rigid base decays slowly and when the pavement is loaded with 100 million cumulative equivalent standard axle loads , its modulus decays about 55%.
