路面结构的路基刚度提高方法

发布时间：2018-06-07 06:40

本文选题：路面结构 + 弯沉等效　；参考：《中南大学学报(自然科学版)》2017年10期

【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。
[Abstract]:In order to meet the requirements of pavement structure for roadbed stiffness, based on the principle of equivalent deflection of elastic half-space and double-layer elastic system, the subgrade stiffness compensation design is carried out, and the influence of roadbed stiffness, overlay material stiffness and overlay thickness on the overlay effect is revealed. A full-scale test road was selected in the large-scale accelerated loading test slot to build the graded crushed stone stiffness compensation layer to calculate and measure the equivalent elastic modulus of the top surface of the roadbed. The finite element calculation of typical pavement structure shows that the theoretical results of equivalent elastic modulus of the top surface of roadbed calculated according to the equivalent principle of deflection are in good agreement with the field test results, which can guide the design of the stiffness compensation layer. When the equivalent modulus of resilience of subgrade is increased from 40 MPa to 120 MPa, the overall stiffness of pavement structure is increased by 26.9, and the tensile stress at the bottom of water-stabilized layer is reduced by 15.1.This indicates that the durability of pavement structure can be improved effectively by increasing subgrade stiffness.
【作者单位】：长沙理工大学交通运输工程学院;
【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)~~
【分类号】：U416.01

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