Volume 38 Issue 5
Oct.  2024
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Li Lin, Xie Jinhong, Yang Shangchuan. Numerical Simulation and Laboratory Tests of Unloading Stress Path of Fly Ash Stratum Tunnel Excavation[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(5): 584-591. doi: 10.3969/j.issn.1007-2993.2024.05.013
Citation: Li Lin, Xie Jinhong, Yang Shangchuan. Numerical Simulation and Laboratory Tests of Unloading Stress Path of Fly Ash Stratum Tunnel Excavation[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(5): 584-591. doi: 10.3969/j.issn.1007-2993.2024.05.013
shu

Numerical Simulation and Laboratory Tests of Unloading Stress Path of Fly Ash Stratum Tunnel Excavation

doi: 10.3969/j.issn.1007-2993.2024.05.013
  • 1.

    Sichuan Road & Bridge Co., Ltd., Highway Three Branch, Chengdu 610200, Sichuan, China

  • 2.

    Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • Received Date: 2023-06-06
  • Accepted Date: 2023-12-25
  • Rev Recd Date: 2023-10-16
    • Available Online: 2024-10-09
  • Publish Date: 2024-10-09
    Abstract
  • The stress path of soil is closely tied to deformation during dynamic tunnel excavation. A three-dimensional model of tunnel construction was created using the FLAC3D finite difference software. The double-side wall guide pit method was used to simulate the excavation process of a large-section tunnel and measure the resulting soil stress state. The changing laws of the stress state were then investigated based on the numerical simulation results. Indoor triaxial tests were conducted on soil reinforced with fly ash cement under different stress paths to replicate the stress and deformation of soil units during tunnel excavation and unloading. Unreinforced soil specimens were used as a control group. The numerical simulations and laboratory test results reveal that the stress paths of the surrounding rock unit soil at monitoring points are complex, and can be roughly divided into two categories: the process of constant confining pressure unloading axial pressure and constant confining pressure rising axial pressure. The cement-reinforced specimens showed less deformation and no signs of failure, while the unreinforced specimens were damaged during the stress path tests of different soil positions within the simulated surrounding rock unit.

     

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