LI K R, WANG M Y, QI C Z, et al． Research on the spatial evolution characteristics of zonal disintegration in deep surrounding rock based on the characteristic energy factor[J]. Journal of Henan Polytechnic University( Natural Science) ，doi: 10.16186/j.cnki.1673-9787.2024100025.

doi: 10.16186/j.cnki.1673-9787.2024100025.

Received： 2024-10-18

Revised： 2024-11-11

Online： 2025-01-08

Research on the spatial evolution characteristics of zonal disintegration in deep surrounding rock based on the characteristic energy factor (Online)

LI Kairui^1,2, WANG Mingyang³, QI Chengzhi¹, CHANG Tingrui¹, LYU Yizheng¹

1.School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China；2. China Railway 14th Bureau Group Co., Ltd., Jinan 250014, Shandong, China；3. State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, The Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

Abstract: The zonal disintegration phenomenon is a typical nonlinear mechanical response in deep underground engineering, representing a unique form of energy dissipation under complex stress conditions. Objectives Due to the limitations of traditional continuum mechanics and fracture mechanics, it is challenging to accurately reveal its spatial structural characteristics, particularly under 3D stress states and complex geological conditions. To address this issue, the spatial structural characteristics was explored from a new perspective for providing scientific guidance for deep tunnel construction. Methods the field measurement,numerical calculation and theoretical analysis method were used to analyze the law of mine pressure behaviors of surrounding rock during gateway excavation in variable width coal pillar.The surrounding rock stress field and the energy distribution characteristics ofcoal-rock mass under the condition of widening coal pillar retaining roadway were studied,and the mechanism of mine pressure behaviors during the gateway excavation of variable width coal pillar in extra-thick coal seam was obtained. Results A comparative analysis with Shemyakin’s empirical formula for the farthest fracture zone radius and measurement data of the 3213 working face in un underground mine validated the scaling evolution relationship between the spatial structure of zonal disintegration and the characteristic energy factor. This indicated that the evolution of the characteristic energy factor can reflect the spatial structure characteristic of zonal disintegration. Conclusions The proposed model for spatial structure has a minimal number of parameters, is easy to measure, and demonstrates strong practicality and applicability, making it well-suited for predictive analysis and support design in deep tunnel construction. Additionally, this model can significantly simplify calculations, providing a novel approach to enhancing safety in deep underground projects. It holds considerable potential for future planning of deep tunnel construction and the development of surrounding rock support strategies.

Key words: deep tunnel; zonal disintegration; excavation disturbance; spatial distribution; characteristic energy factor