层间脱空时水泥混凝土路面的荷载应力特征  

Load Stress Characteristics of Cement Concrete Pavement when Interlayer Disengaging

作　　者：张艳聪[1] 刘少文[1] 申俊敏[1] 高玲玲[2] 

机构地区：[1]山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006 [2]山西水利职业技术学院道路与桥梁工程系,山西运城044004

出　　处：《公路工程》2015年第3期25-27,36,共4页Highway Engineering

基　　金：国家自然科学基金项目(51308329);山西省自然科学基金项目(2013011027-1);山西省交通厅科技项目(2013-1-10)

摘　　要：针对水泥混凝土路面层间脱空问题,采用有限元方法,建立了弹性半空间地基上考虑脱空的三维路面结构模型,计算了板角、接缝和板中3种脱空位置处脱空面积对面层荷载应力的影响。结果表明:对于板角脱空,脱空长度与宽度接近时,面层荷载应力最大;对于接缝中部脱空,平行于接缝方向的脱空越多,面层应力分布越不利;对于板中脱空,面层应力对脱空形状的敏感性较低。无论脱空位置如何,面层底部最大弯拉应力均随脱空面积、荷载大小的增加而增大,但与板角脱空和接缝脱空相比,板中脱空对面层应力的影响较小。To deal with the problem interlayer disengaging in cement concrete pavement,3D model of the pavement structure on elastic half-space foundation consider disengaging was established by FEM. The effect of disengaging area on load stress of surface was calculated when disengaging position at slab corner,joint and slab center. The results showed that： for slab corner disengaging,load stress of surface obtained the maximum stress when disengaging length was equal to width. For joint disengaging,when amount of disengaging that parallel to the joint direction was larger,surface flexural tensile stress was bigger. For slab center disengaging,disengaging shape had little influence on load stress of surface.No matter where the disengaging position,the maximum stress of surface increased with disengaging area and vehicle load. However,the effect of slab center disengaging was not as good as slab corner and joint disengaging big influence on surface stresses

关 键 词：道路工程 荷载应力 有限元 脱空 

分 类 号：U416.216[交通运输工程—道路与铁道工程]