Advanced Stability Analysis of the Tunnels in Jointed Rock Mass Based on TSP and DEM

Abstract

The discrete element method (DEM) can analyze the large deformation and large displacement of rock mass effectively, and it is widely used in underground engineering, slope engineering and other fields. However, due to the low accuracy of rock mass structural surface information acquisition, the application of discrete element method in the analysis of jointed rock mass stability is still deviated. In this paper, combined with the advantages of the tunnel seismic prediction (TSP) in obtaining discontinuous geological interface information and the discrete element method in the calculation and analysis of jointed rock mass stability, this paper proposes an advanced analysis method for jointed rock mass stability based on TSP and DEM. Compared to the traditional methods, the analysis results of the jointed rock mass stability are more reliable. Firstly, relying on the advanced detection system — Tunnel Seismic Prediction 203Plus, the unstructured rock mass structure information of the tunnel is obtained, and the spatial attitude of the discontinuous geological interface is further determined. Secondly, based on the Fish programming language, the non-continuous geological interface information can be expressed in the discrete unit software — 3D Distinct Element Code (3DEC). In this way, the excavation calculation model of the tunnels in jointed rock mass can be constructed. Finally, based on the DEM, the excavation of the tunnels in jointed rock mass can be simulated, analyze the stability of surrounding rock during the tunnel excavation process, and realize the stability analysis of surrounding rock stability of jointed rock mass. Based on the Huangjiazhuang Tunnel Project, this paper uses the above method to carry out on-site application. The results show that the location of the dangerous block is predicted to be consistent with the actual exposure of the tunnel surrounding rock based on TSP and DEM, which verify the accuracy and feasibility of this method, and the research results have practical guiding significance for the safe construction of the tunnels in jointed rock mass.

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Acknowledgments

This work was supported by the National Science Fund for Excellent Young Scholars (51722904), National Natural Science Foundation of China (51679131), Shandong Transportation Science and Technology Plan (2019B47_1).

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Correspondence to Hongliang Liu.

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Fan, H., Li, L., Liu, H. et al. Advanced Stability Analysis of the Tunnels in Jointed Rock Mass Based on TSP and DEM. KSCE J Civ Eng (2021). https://doi.org/10.1007/s12205-021-0170-2

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Keywords

  • TSP
  • DEM
  • Jointed rock mass
  • Numerical calculation
  • 3DEC