多年冻土区路基尺度效应对路面结构力学响应的影响

doi:10.7522/j.issn.1000-0240.2014.0103

摘要/Abstract

摘要： 为了研究不同尺度路基融沉作用对路面结构层力学响应的影响，建立了基于热力耦合理论的有限元模型，系统研究不同路基尺度工况下，融沉作用对不同厚度路面、不同材料基层的力学分布规律影响. 结果表明：相同的融沉条件下，整体式路基较分离式及二级路基，变形分别增大45%、64%，应力增大17.5%、21.7%. 高速公路面层由于路基较宽，地基融沉更容易向上传递，进而导致面层底部应力增大，最终造成面层的破坏. 因此，路面设计过程中保证一定的面层厚度，并采用柔性基层减小模量，可有效以降低层底应力水平，并防止基层裂缝向上反射.

关键词: 道路工程, 冻土路基, 尺度效应, FEM

Abstract: In order to study the pavement structure mechanical response of subgrade scale effects in permafrost regions, finite element model was established based on the theory of thermal and mechanical coupling, to systematically study the distribution of mechanical effects under different scales subgrade conditions, pavement thickness and semi-rigid base materials. The results show that as compared to disconnect-type subgrade and secondary road subgrade, the deformation of monolithic roadbed increases 45 % and 64%, and stress of it increases 17.5% and 21.7%. Foundation thaw settlement of expressway is easier to pass up, because of the wide roadbed, stress in the bottom of the pavement rapidly increasing, ultimately resulting in damage in pavement structure. Therefore, to ensure a certain thickness of pavement, and use flexible substratum with small modulus will be effectively reduce stress in the bottom and prevent cracks in semi-rigid substratum stretching upwards.

Key words: highway engineering, subgrade on permafrost, scale effects, FEM

中图分类号:

U416

穆柯, 金龙, 朱东鹏, 陈建兵, 袁堃. 多年冻土区路基尺度效应对路面结构力学响应的影响[J]. 冰川冻土, 2014, 36(4): 862-869.

MU Ke, JIN Long, ZHU Dongpeng, CHEN Jianbing, YUAN Kun. Study of the pavement structure mechanical response of scale effects of subgrade in permafrost regions[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2014, 36(4): 862-869.

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