基于路面破坏响应的差异沉降控制标准.pdf

第30 卷 第5 期 长安大学学报( 自然科学版) Vol. 30 No. 5 2010 年9 月 Journal of Chan an University( Natural Science Edition) Sept . 2010 : 2010) 1, 2 1 1 程兴新 , 王选仓 , 高志伟 ( 1. , 710064; 2. , 710064) : 针对高速公路路基差异 降引起的路面破坏问题, 经过路面结构力学响应分析, 建立差异 降控制标准, 对路基施工质量进行控制, 防止路面开裂通过对路面结构有限元模型施加初始位 移边界条件, 模拟差异 降对路面结构的影响; 对不同差异 降作用下路面结构附加应力进行分 析, 综合考虑路面材料抗弯拉强度与结构层抗疲劳破坏性能, 提出了基于路面破坏响应的差异 降 控制标准结果表明: 只考虑路面材料抗弯拉强度时, 以变坡率0. 23%作为 降控制标准; 考虑结 构层抗疲劳破坏性能时, 以变坡率0. 58%作为差异控制标准, 综合考虑二者共同影响时, 以变坡率 0. 37%作为差异控制标准, 相应的路基横向与纵向 降控制值分别为4. 5 cm 和7. 5 cm : 道路工程; 差异 降; 控制标准; 有限元法; 路面结构; 破坏响应 : U 416. 1 : A Control criteri on of subgrade diff erential settl ement based on pavement damage response CHEN G Xin x in1, 2 , WA NG Xuancan 1 , GA O Zhiw ei1 ( 1. School of H i hway , Chan an University , Xian 710064, Shaanx i, China; 2. Traffic En ineerin Quot a St at ion, T ransportation Department of Shaanx i Province, Xian 710064, Shaanx i, China) Abstract: Aimed at expr essw ay pavement dama e caused by differential settlements, a differential settlement control standard is established accordin to the mechanical response of pavement struc ture, so that the sub r ade construction quality can be controlled and pavement crackin can be prevented. A boundary condition is imposed to the finite element model of pavement structure in order to simulate differential settlement on the pavement structur e. A differential settlement con trol standard w as proposed considerin flexural stren th of pavement materials and fati ue dam a e performance of pavement structure. T he results show that : the var iable slope r ate of 0. 23%