| 不同软基处理方式下高速公路加宽工程变形特性分析 |
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| 引用本文： | 张军辉.不同软基处理方式下高速公路加宽工程变形特性分析[J].岩土力学,2011,32(4):1216-1222. |
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| 作者姓名： | 张军辉 |
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| 作者单位： | 长沙理工大学 公路工程教育部重点实验室，长沙 410004 |
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| 基金项目： | 交通部西部交通科技项目，交通部西部交通科技项目应用基础研究项目，长沙理工大学公路工程省部共建教育部重点实验室开放基金资助项目，湖南省教育厅项目 |
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| 摘 要： | 交通量的迅速增长使越来越多早期建成的高速公路需要拓宽改建，而如何根据老路的地基处理方法合理选择新路基下软基的处理方法成为主要技术难题之一。以实体工程为依托，采用有限元方法分析了新老路软基采用不同处理方法对加宽工程道路变形的影响。结果表明，新路基采用塑料排水板对施工期老路扰动很大，而采用复合地基可有效降低工后沉降和施工期老路变形。同时，地基内水平位移分布为采用应力隔离墙降低新路荷载对老路的影响提供了理论依据，隔离墙深度可根据水平位移集中区的埋深确定。此外，当新路采用复合地基时，施工期老路沉降变形受老路固结状况的影响较小。
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| 关 键 词： | 软基处理 加宽 差异沉降 水平位移 数值分析 |
| 收稿时间： | 2009-11-26 |
Analysis of deformation behavior of expressway widening engineering under different foundation treatments |
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| ZHANG Jun-hui.Analysis of deformation behavior of expressway widening engineering under different foundation treatments[J].Rock and Soil Mechanics,2011,32(4):1216-1222. |
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| Authors: | ZHANG Jun-hui |
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| Institution: | Key Laboratory of Highway Engineering of Ministry of Education, Changsha University of Science & Technology, Changsha 410004, China |
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| Abstract: | Due to the rapid increase of traffics, more and more early-built expressways will be reconstructed. There are always several key technical problems for expressway widening on soft foundation, in which determining how to treat the foundation of the new road according to the old road foundation treatment methods is the most important. Effects of the different foundation treatments on road deformation are analyzed numerically according to a practice of expressway widening. Results show that the plastic drainage board used in the new foundation enhances the old road deformation greatly during widening; while the new foundation with composite foundation produce less settlement of the new and old embankment after construction and disturbance to the old road during widening. At the same time, the distribution of the horizontal displacements in foundation provides the theory base for using the stress isolation wall to reduce the deformation of old road resulting from the new embankment. The wall depth depends on the depth of the horizontal displacement concentration zones. In addition, the impact of consolidation degree of the old foundation on the deformation of the existing road during widening is insignificant when the composite foundation is used in the new foundation. |
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| Keywords: | foundation treatment widening differential settlement horizontal displacement numerical analysis |
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