路面结构的路基刚度提高方法  

Promotion method of subgrade stiffness for pavement structure

作　　者：黄拓[1] 昌振东 漆帅 HUANG Tuo;CHANG Zhendong;QI Shuai(School of Traffic and Transportation Engineering,Changsha University of Science & Technology, Changsha 410114, China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《中南大学学报（自然科学版）》2017年第10期2779-2784,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51608055);湖南省自然科学基金资助项目(2017JJ3337);湖南省教育厅项目(16C0051);交通运输部建设科技项目(2015318825120);长沙市科技计划项目(Kq1701078)~~

摘　　要：为满足路面结构对路基刚度的要求,基于弹性半空间和双层弹性体系弯沉等效原则,进行路基刚度补偿设计,揭示路基刚度、加铺材料刚度和加铺层厚度对加铺效果的影响。在大型加速加载试槽中选取一段足尺试验路,铺筑级配碎石刚度补偿层,计算并实测路基顶面当量回弹模量。对典型路面结构进行有限元计算,研究结果表明:按弯沉等效原则计算的路基顶面当量回弹模量理论结果与现场测试结果较吻合,能指导刚度补偿层的设计;当路基当量回弹模量从40 MPa提高至120 MPa时,路面结构的整体刚度提高26.9%,水稳层底的拉应力降低15.1%,说明提高路基刚度,能够有效提高路面结构的耐久性。In order to meet the requirements of subgrade stiffness for pavement structure,the stiffness compensation design of subgrade was carried out based on deflection equivalent principle of elastic half-space and double-layer elastic system.And the influence of subgrade stiffness,stiffness and thickness of the overlay on the stiffness compensation effect was revealed.A full scale test road was selected in the large accelerated loading field,and the graded crushed stone stiffness compensation layer was paved on the subgrade.Besides,the equivalent resilient modulus at the top of the subgrade was tested and calculated.The finite element calculation was carried to typical pavement structure.The results show that the modulus calculated by deflection equivalent principle is in good accordance with the field test result,which can provide guidance for the design of stiffness compensation layer.When equivalent resilient modulus of subgrade increases from40MPa to120MPa,the stiffness of pavement structure increases by26.9%,and the tensile stress at the bottom of cement stabilized subbase decreases by15.1%.Therefore,improving the stiffness of subgrade can effectively improve the durability of pavement structure.

关 键 词：路面结构 弯沉等效 路基刚度补偿设计 足尺试验 

分 类 号：U414[交通运输工程—道路与铁道工程]