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Volume 37 Issue 9
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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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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

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  • Received Date: December 15, 2014
  • Published Date: September 17, 2015
    Graphical Abstract
    • 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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    • References (16)
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