ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction ›› 2023, Vol. 43 ›› Issue (S1): 198-205.DOI: 10.3973/j.issn.2096-4498.2023.S1.023

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Fine Scoring for Surrounding Rock of WaterDiversion Tunnel in Layered Rock Mass Considering Occurrence of Structural Plane

(1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China; 2. Northwest Water Conservancy and Hydropower Engineering Co., Ltd., Xi′an 710100, Shaanxi, China)   

  1. To investigate the influence of occurrence of layered rock mass on the surrounding rock scroing, relevant specifications and research results in China and abroad are summarized, fine scroing is conducted on the surrounding rock of waterdiversion tunnels in layered rock mass considering the structural occurrence distribution of surrounding rocks, and the influence of tunnel excavation direction, the inclination and dip angle of the rock structural plane on the stability of the surrounding rock of the tunnel are analyzed. First, the finite element software Midas GTS is used to simulate 21 working conditions, and the displacement, surrounding rock pressure, maximum shear stress, maximum and minimum principal stresses at the crown, sidewall and bottom plate of the model are comprehensively analyzed. Second, the membership function is used to construct a fuzzy matrix for each index, and the fuzzy matrix obtained is multiplied by the weight obtained by AHP method to output a more precise evaluation result of structural plane occurrence. The results show that when the angle between the structural plane and the excavation direction of the tunnel is 0°, the scores of crown and bottom plate increase greatly with the increase of the dip angle of the rock mass.
  • Online:2023-07-31 Published:2023-08-28

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Abstract: layered rock mass; water-diversion tunnel; occurrence of structural plane; fine scoring; analytic hierarchy process method; fuzzy matter-element theory

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