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中低压缩性土地区桩承式加筋路堤现场试验研究

郑俊杰, 曹文昭, 董同新, 张军, 谢明星

郑俊杰, 曹文昭, 董同新, 张军, 谢明星. 中低压缩性土地区桩承式加筋路堤现场试验研究[J]. 岩土工程学报, 2015, 37(9): 1549-1555. DOI: 10.11779/CJGE201509001
引用本文: 郑俊杰, 曹文昭, 董同新, 张军, 谢明星. 中低压缩性土地区桩承式加筋路堤现场试验研究[J]. 岩土工程学报, 2015, 37(9): 1549-1555. DOI: 10.11779/CJGE201509001
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ZHENG Jun-jie, CAO Wen-zhao, DONG Tong-xin, ZHANG Jun, XIE Ming-xing. Experimental investigation of geogrid-reinforced and pile-supported embankment on soils with medium-low compressibility[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(9): 1549-1555. DOI: 10.11779/CJGE201509001
Citation: ZHENG Jun-jie, CAO Wen-zhao, DONG Tong-xin, ZHANG Jun, XIE Ming-xing. Experimental investigation of geogrid-reinforced and pile-supported embankment on soils with medium-low compressibility[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(9): 1549-1555. DOI: 10.11779/CJGE201509001
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中低压缩性土地区桩承式加筋路堤现场试验研究  English Version

  • 1. 华中科技大学岩土与地下工程研究所,湖北 武汉 430074; 2. 中铁第四勘察设计院集团有限公司,湖北 武汉 430063; 3. 山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,山西 太原 030006

基金项目: 国家自然科学基金项目（51278216）; 铁四院科技研究开发计划（2010K29-1,2013K24-1）; 华中科技大学研究生创新创业基金项目（HF-11-13-2013）
详细信息
    作者简介:

    郑俊杰(1967- ),男,湖北武汉人,博士,教授,博士生导师,主要从事岩土工程与隧道工程方面的教学、科研与技术咨询工作。E-mail: zhengjj@hust.edu.cn。

Experimental investigation of geogrid-reinforced and pile-supported embankment on soils with medium-low compressibility

  • 1. Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China; 3. Key Laboratory of Highway Construction and Maintenance Technology in Loess Region, Shanxi Transportation Research Institute, Taiyuan 030006, China

摘要

    摘要
  • 摘要: 将桩承式加筋路堤技术应用于中低压缩性土地区高速铁路桥台和涵洞之间填方路基的处理,通过逐渐改变CFG桩桩长形成刚度均匀变化的地基加固区,严格控制线路纵向差异沉降。通过现场试验对桥台、涵顶和路基中心地基沉降进行了长期观测,同时对桩承式加筋路堤桩间土沉降、孔隙水压力、格栅上下表面土压力和格栅变形进行了长期监测分析。研究结果表明：桩承式加筋路堤可有效减小中低压缩性土地基沉降,总沉降小且很快趋于稳定;桩承式加筋路堤通过土拱效应和张拉膜效应将路堤荷载向桩帽传递,格栅下桩土应力比明显高于格栅上,张拉膜效应明显,格栅上桩土应力比接近1.0,土拱效应较弱;格栅在路肩处发挥的作用强于线路中心处。
    Abstract: The geogrid-reinforced and pile-supported embankment is adopted to treat the subgrade of high-speed railways between the bridge abutment and culvert on the soils with medium-low compressibility. The subgrade with uniformly variable stiffness is formed by varying the lengths of CFG piles gradually aiming at controlling the longitudinal differential settlement strictly. The settlements of bridge abutment, culvert and subgrade center are monitored based on full scale field tests. Meanwhile, the settlement of the surrounding soils of pile, the pore water pressure, the earth pressure above/below the geogrid, and the geogrid deformation are measured. The experimental results demonstrate that the total and layered settlements of the subsoils with medium-low compressibility are reduced effectively, and the total settlements are very small and reach the stable value soon. The embankment load is transferred to pile caps by the combined action of soil arching effect and tensioned membrane effect. The pile-soil pressure ratio below the geogrid is significantly larger than that above the geogrid, which suggests that an obvious tensioned membrane effect exists. The pile-soil pressure ratio to 1.0 above the geogrid means that the soil arching effect is not obvious. Superior performance of the geogrid is observed at the road shoulders compared with that at the rails center.
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    • 参考文献(16)
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出版历程
  • 收稿日期:  2014-12-15
  • 发布日期:  2015-09-17

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