| 改扩建道路纵向加高拓宽路基沉降特性与影响因素研究 |
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| 引用本文： | 于建荣,程小强,李峰,黄亚飞.改扩建道路纵向加高拓宽路基沉降特性与影响因素研究[J].路基工程,2019,0(5):35-39. |
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| 作者姓名： | 于建荣 程小强 李峰 黄亚飞 |
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| 作者单位： | 1.深圳惠盐高速公路有限公司, 广东深圳 518081 |
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| 基金项目： | 国家重点研发计划项目（2016YFC0802203） |
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| 摘 要： | 依托惠盐高速深圳段改扩建工程，建立加高拓宽路基变形计算模型，分析了路基弹性模量、地基压缩模量、路基加高高度等因素对路基沉降变形的影响，得到了旧路加高拓宽沉降变形特性。研究结果表明:当拓宽部分地基较软弱或旧路加高高度较小时，横断面的沉降曲线呈“反盆形”；当拓宽部分地基压缩模量较大或加高高度较大时，横断面的沉降曲线呈“盆形”；随着新填路基弹性模量的提高，道路的不均匀沉降量逐渐减小，但减小的速率逐渐降低；对地基进行加固处理后的压缩模量不宜超过既有道路下地基的压缩模量，过分加固地基可能会使路面形成反向坡；对于路基加高高度小于2 m的路段，宜使拓宽部分地基的压缩模量大于旧地基；对于路基加高高度大于2 m的路段，则应使拓宽部分地基的压缩模量小于旧地基。
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| 关 键 词： | 道路改扩建 加高拓宽 差异沉降 变形特性 计算模型 |
| 收稿时间： | 2019-11-11 |
Study on Subgrade Settement Characteristics and the Influencing Factors by Lengthwise Heightening and Widening in Road Reconstruction and Extension |
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| Abstract: | Based on the reconstruction and extension project of Huizhou-Yantian Highway in Shenzhen, the model calculating deformation of subgrade heightened and widened was established to analyze how the elastic modulus of subgrade, the compression modulus of foundation and the increased height of subgrade influenced the subgrade settlement deformation, and then to find out the settlement deformation characteristics of the old roadbed after heightening and widening. The results show that, where the foundation of widened section is soft or the increased height is small, the settlement curve of cross section is of inverted basin-shape; where the foundation of widened section has relatively large compression modulus or the increased height is large, the settlement curve of cross section is of basin-shape; with the increase of the elastic modulus of newly-filled subgrade, the non-uniform subsidence of road gradually decreases at a gradually-decreased rate; after reinforcement, the compression modulus of the foundation should not exceed that of the foundation under existing road, and excessive reinforcement of foundation may cause the pavement to form a reverse slope; for the section with the increased height less than 2 m, it is appropriate to allow the compression modulus of foundation in the widened section larger than that of the old foundation, while for the section with the increased height more than 2 m, it shall to allow the compression modulus less than that of the old foundation. |
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