为了解共振碎石化路面的碎石化效果, 获得设计依据和参数, 以上海沪青平公路及金山大道为依托, 通过现场取样进行室内筛分分析, 得到碎石化层颗粒尺寸、分布及级配情况;通过现场落锤式弯沉仪(FWD)测试和承载板测试计算出碎石化前后结构层回弹模量, 进而评价碎石化法对旧路地基的影响并得到碎石化层的力学性能;根据试验路所在地区的公路FWD与贝克曼梁弯沉转换关系, 将FWD实测弯沉换算为贝克曼梁弯沉后与设计弯沉相比较, 并据此提出了旧水泥混凝土路面碎石化后的部分验收标准。研究结果表明:碎石化路面设计弯沉应按柔性基层设计。研究结果及提出的相关验收标准可为今后碎石化道路施工及设计提供参考。
Abstract
In order to understand the rubblized effects of resonant rubblized PCC pavement, and obtain the design considerations and parameters, authors carried out this research based on Huqingping and Jinshan Roads in Shanghai. Particle size, gradation and distribution of rubblized layer were got through sieve analysis of in-situ rubblized material samples. The modulus of structure layer was calculated using the in-situ data of FWD and bearing plate testing. Then the effects of rubblizing method on subgrade caused by rubblization construction were evaluated, and the mechanical properties of rubblized layer were obtained. The overlay design deflection of rubblized pavement should be calculated regarding the layers beneath HMA as a whole flexible base after the comparison between design deflection and Benkelman beam deflection. The latter was converted from FWD data according to the relationship between FWD and Benkelman beam deflection in local region. Authors hereby proposed some checking standard for rubblized PCC pavement. Study results show that in process of design deflection of rubblized pavement, pavement should be regarded as soft base layer and relative checking standard got by study can provide several references for design and construction.
关键词
道路工程 /
旧水泥混凝土路面 /
共振碎石化法 /
反射裂缝 /
级配 /
弯沉测试
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Key words
road engineering /
PCC /
resonant rubblizing method /
reflective crack /
gradation /
deflection test
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中图分类号：
U416.2
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参考文献
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[8]凌建明, 吴青峰, 徐柱杰, 等.水泥路面共振碎石化加铺技术研究与应用[R].上海:同济大学, 2007:78-86.
LING Jian-ming, WU Qing-feng, XU Zhu-jie, et al.Research and Application of Resonant Rubblized Overlay Technique of Cement Pavement[R].Shanghai:Tongji University, 2007:78-86.
[9]CEYLAN H, GOPALAKRISHNAN K, KIM S.Rehabilitation of Concrete Pavements Utilizing Rubblization and Crack and Seat Methods: Phase II-Performance Evaluation of Rubblized Pavements in Iowa[R].Ames:Iowa State University, 2008:31-33.
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脚注
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基金
上海市市政工程管理局科技发展基金项目
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