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GU Shuan-cheng, HUANG Rong-bin, SU Pei-li. Force rule of composite lining considering creep of tunnel surrounding rock[J]. Journal of Traffic and Transportation Engineering, 2018, 18(2): 53-60. doi: 10.19818/j.cnki.1671-1637.2018.02.006
Citation: GU Shuan-cheng, HUANG Rong-bin, SU Pei-li. Force rule of composite lining considering creep of tunnel surrounding rock[J]. Journal of Traffic and Transportation Engineering, 2018, 18(2): 53-60. doi: 10.19818/j.cnki.1671-1637.2018.02.006
shu

Force rule of composite lining considering creep of tunnel surrounding rock

doi: 10.19818/j.cnki.1671-1637.2018.02.006

  • School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China

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  • Author Bio:

    GU Shuan-cheng(1963-), male, professor, PhD, yikaiyizhi@qq.com

  • Corresponding author: HUANG Rong-bin(1988-), male, doctoral student, 446413318@qq.com
  • Received Date: 2017-09-09
  • Publish Date: 2018-04-25
    Abstract
  • Anchor force was regarded as the physical force acting on the surrounding rock, the initial support and the surrounding rock in the anchorage zone were regarded as reinforced surrounding rock, and the mechanical model of surrounding rock was established.Based on the unified strength theory, the stress and deformation laws of surrounding rock of tunnel in the creep process were analyzed, the expressions of stress and deformation of composite lining were derived, and the stress characteristics of supporting structure in the creep process of tunnel surrounding rock and the change laws of secondary lining stresses under different initial support strengths were analyzed.Analysis result shows that compared with the excavation stage, the maximum forces of bolt and shotcrete are 48 kPa and 286 kPa in the creep process of surrounding rock, respectively, and increase by 57.5% and 13.7%, respectively, which exceeds themaximum bearing capacity of supporting structure when the initial support is designed in accordance with the principle of"the initial support should be based on the joint force with the surrounding rock to ensure the safety of construction phase".So it can cause the failure of initial support structure during tunnel operation if only to meet the stability of surrounding rock during tunnel excavation without considering the additional stress caused by the creep during designing the initial support, which is not conducive to tunnel stability.When the thickness of secondary lining increases from 300 mm to 500 mm, its maximum load increases by 40.5%, and the load sharing ratio increases from 25.2% to 36.2%.When the initial support strength increases, the load of secondary lining reduces by 14.5%, and the load sharing ratio reduces from 25.2% to22.3%.So the load of secondary lining decreases with the increase of initial supporting strength, but increases with the increase of itself strength, and it is important to rationally allocate the strengths of initial support and secondary lining support to realize the reasonable distribution of surrounding rock pressure.In order to realize the effect that the primary support and the secondary lining jointly bear the additional stress caused by the creep under the condition of soft rock geology, the primary support not only ensures the stability of surrounding rock during tunnel construction, but also avoids the structural damage in the process of rock creep.

     

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