基于土工合成材料加铺层的沥青混凝土路面抗裂性能  

Crack Resistance of Geosynthetics Overlay Based Asphalt Concrete Pavement

作　　者：孙雅珍[1] 刘杰民[1] 赵复笑[2] 

机构地区：[1]沈阳建筑大学,辽宁沈阳110168 [2]辽宁省交通科学研究院,辽宁沈阳110000

出　　处：《公路交通科技》2012年第1期34-37,共4页Journal of Highway and Transportation Research and Development

基　　金：辽宁省自然科学基金项目(201102178);辽宁省教育厅项目(2009B152);住房与城乡建设部项目(2009-K4-21)

摘　　要：应用数值计算的方法和冲击韧性试验研究在行车载荷作用下土工合成材料加铺层对含反射裂缝沥青混凝土路面的抗裂效果,并对土工合成材料弹性模量进行了优化设计。分析了温度、时间和加铺层弹性模量对裂缝延长线上各点正应力和面层层底拉应力的影响;应用冲击韧性试验系统评价了土工合成材料加铺层的抗裂效果。数值计算与冲击韧性试验结果基本一致。研究结果表明:铺设土工合成材料是防治反射裂缝的有效途径,能有效地改变结构的应力分布,更大程度地减少了应力集中;同时确定最佳的土工布加铺层的弹性模量为1 000 MPa;但加铺层对含裂缝沥青混凝土路面的路表弯沉基本没有影响。The effect of geosynthetics overlay on retarding propagation of reflective cracks in AC pavement under vehicle load was studied by numerical calculation and impact toughness test, and the modulus of geosynthetics overlay was optimized. The effects of temperature, time and elastic modulus of the geosynthetics overlay on the tensile stress at the bottom of surface course and the normal stresses on the line of extensional crack-tip were analyzed. The impact toughness test was conducted to evaluate the effectiveness of the crack resistance of the geosynthetics overlay. The numerical calculation result was consistency with the test result. The results show that （1） geosynthetics overlay is effective for reflective crack resistance, it could obviously decrease stress concentration and change stress distribution; （2） the elastic modulus of the optimum geosynthetics overlay is 1 000 MPa; （3） the geosynthetics overlay basically has no effect on the vertical deflection of the road surface.

关 键 词：道路工程 抗裂性能 冲击韧性试验 土工合成材料加铺层 反射裂缝 

分 类 号：U416.2[交通运输工程—道路与铁道工程]