Volume 39 Issue 5
Oct.  2025
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2025  >  39(5): 699-708
Song Haishan, Li Zhuyan, Ding Chunfu, Li Liyun. Mechanics and deformation characteristics of bored pile and rotary jet grouting pile composite structure for tunnel in water-rich stratum[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 699-708. doi: 10.20265/j.cnki.issn.1007-2993.2024-0336
Citation: Song Haishan, Li Zhuyan, Ding Chunfu, Li Liyun. Mechanics and deformation characteristics of bored pile and rotary jet grouting pile composite structure for tunnel in water-rich stratum[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 699-708. doi: 10.20265/j.cnki.issn.1007-2993.2024-0336
shu

Mechanics and deformation characteristics of bored pile and rotary jet grouting pile composite structure for tunnel in water-rich stratum

doi: 10.20265/j.cnki.issn.1007-2993.2024-0336
  • 1.

    Road & Bridge International Co., Ltd., Beijing 100120, China

  • 2.

    College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

  • Received Date: 2024-07-22
  • Accepted Date: 2025-04-09
  • Rev Recd Date: 2025-03-02
  • Publish Date: 2025-10-10
    Abstract
  • To explore the applicability of the "bored pile+jet grouting pile" composite structure in the construction of PBA tunnel and reveal its mechanical effect, based on the engineering example of the underground excavation section of Dongsanlu Station to Tiantongyuan East Station of Beijing Rail Transit Line 13, the numerical simulation of the whole construction process of PBA tunnel under the support of the composite structure in confined water rich strata was carried out. The internal force and deformation of the composite structure under the key construction steps and the influence of its construction process on the surface settlement and formation of the plastic zone were analyzed, and the effects of pile diameter, pile insertion ratio, and pile interlocking on its mechanical performance were discussed. The results show that: (1) The construction stage of the composite structure has little effect on the surface settlement trough and formation plastic zone; (2) The composite structure mainly appears horizontal lateral displacement towards the inner side of the tunnel during the construction of the tunnel. The overall lateral displacement is in the form of a quadratic curve along the depth direction. The maximum lateral displacement occurs in the middle of the jet grouting pile and the upper part of the bored pile, and the lateral displacement below the bottom plate is small; (3) After the excavation of the main tunnel, the axial forces of bored piles and jet grouting piles are evenly distributed in the free section of the excavation of the main tunnel, the axial forces and bending moments are sharply reduced below the bottom plate, and the maximum axial forces and bending moments are located near the bottom plate.

     

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