Theoretical Study on Relaxed Surrounding Rock Pressure on Shallow Bias Neighborhood Tunnels under Seismic Load

Authors

  • Xinrong Liu
    Affiliation

    School of Civil Engineering, Chongqing University, Chongqing 400045, China

    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

    National Joint Engineering Research Center of Geohazards Prevention in The Reservoir Areas, Chongqing University, Chongqing 400045, China

  • Fei Xiong
    Affiliation

    School of Civil Engineering, Chongqing University, Chongqing 400045, China

    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

  • Dongshuang Liu
    Affiliation

    School of Civil Engineering, Chongqing University, Chongqing 400045, China

    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

  • Xiaohan Zhou
    Affiliation

    School of Civil Engineering, Chongqing University, Chongqing 400045, China

    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

    National Joint Engineering Research Center of Geohazards Prevention in The Reservoir Areas, Chongqing University, Chongqing 400045, China

  • Dongliang Li
    Affiliation

    Chongqing Housing and Urban Rural Construction Commission, Chongqing 400010, China

  • Linfeng Wang
    Affiliation

    School of Civil Engineering, Chongqing University, Chongqing 400045, China

    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

  • Yafeng Han
    Affiliation

    School of Civil Engineering, Chongqing University, Chongqing 400045, China

  • Chunmei He
    Affiliation

    College of Architectural Engineering, Neijiang Normal University, Neijiang 641100, China

https://doi.org/10.3311/PPci.18697

Abstract

To study the distribution of relaxed surrounding rock pressure on the shallow bias neighborhood tunnels under the combined action of horizontal and vertical earthquake force, finite element software was used for failure mode analysis. Moreover, with the pseudo-static method, the calculation formula for the relaxed pressure on the shallow bias neighborhood tunnels was derived and used to analyze the variation of the rupture angle of these tunnels under the action of the seismic force. The study shows that: shallow bias neighborhood tunnels basically follow a “W” failure pattern under the combined action of horizontal and vertical seismic force, and the failure scope of the surrounding rock is controlled by four rupture angles. Rupture angles β2 and β3 between the deep and shallow tunnels of the shallow bias neighborhood tunnels are not affected by the surface slope. For tunnels with the same grade of the surrounding rock, the greater the seismic intensity, the smaller the value of β2, and the greater the value of β3. While at the same seismic intensity, the higher the grade of the surrounding rock, the smaller the β2 and β3. Ruptures angles β1 and β4 are influenced by the surface slope, seismic intensity and surrounding rock grades. A steeper surface slope leads to a smaller β1 and a greater β4; β1 increase and β4 decrease with increasing seismic intensity; while, β1 and β4 both show a decreasing trend with an increasing rock grade.

Keywords:

shallow; bias; tunnel; relaxed surrounding rock pressure; rupture angle

Published Online

2021-11-02

How to Cite

Liu, X., Xiong, F., Liu, D., Zhou, X., Li, D., Wang, L., Han, Y., He, C. “Theoretical Study on Relaxed Surrounding Rock Pressure on Shallow Bias Neighborhood Tunnels under Seismic Load”, Periodica Polytechnica Civil Engineering, 65(4), pp. 1227–1238, 2021. https://doi.org/10.3311/PPci.18697

Issue

Section

Research Article