Research on Zonal Disintegration Mechanisms of Surrounding Rock in Deep-Buried Tunnels with Structural Planes

  • Hu Xinwei ,
  • Yang Shikou ,
  • Sun Kuan ,
  • Chen Chongping ,
  • Deng Zhengding
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  • 1. School of Civil Engineering and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, P. R. China;
    2. Jiangxi Province Key Laboratory of Water Ecological Conservation in Headwater Regions, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, P. R. China;
    3. China Seventeenth Metallurgical Construction Group Design & Research Institute, Ma'anshan, Anhui 243000, P. R. China

Received date: 2025-01-11

  Online published: 2026-01-26

Abstract

A large number of discontinuous structural planes, such as joints, fissures and faults, are present within the rock mass. After deep-buried tunnel excavation, the surrounding rock may undergo zonal disintegration, and the intersection and coalescence of these excavation-induced fractures with pre-existing planes can trigger serious hazards such as excessive deformation, water inrush, and large-scale collapse. To explore the influence of internal structural plane on the zonal fracturing of deep-buried tunnel surrounding rock, water diversion tunnels of Jinping II hydropower station as the research background, a numerical model of the tunnel containing structural planes was established based on the strain-softening model to study the variation laws of the zonal disintegration morphology, the number of disintegration zones, and the volume of the disintegration zones of the surrounding rock after the excavation of deep-buried tunnel with respect to the distribution position, dip angle, and strength of the structural planes. The results show that: When the structural planes are located on both sides of the tunnel, the smaller the clear distance between the structural planes and the tunnel, the greater the degree of disintegration of the surrounding rock, and the more obvious the effect of the structural planes in inhibiting the deep extension of zonal disintegration; After the structural planes intersect with the tunnel, the structural planes will change the zonal disintegration morphology instead of effectively inhibit zonal disintegration; The zonal disintegration morphology of the surrounding rock will rotate with the change of the dip angle of the structural planes; The smaller the strength of the structural planes, the more intense the zonal disintegration of the surrounding rock, and the more obvious the effect of the structural planes in inhibiting the deep extension of zonal disintegration. The research results can provide theoretical support for the design of the surrounding rock support structure during the excavation of deep-buried tunnel.

Cite this article

Hu Xinwei , Yang Shikou , Sun Kuan , Chen Chongping , Deng Zhengding . Research on Zonal Disintegration Mechanisms of Surrounding Rock in Deep-Buried Tunnels with Structural Planes[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(S2) : 572 -580 . DOI: 10.20174/j.JUSE.2025.S2.05

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