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The evolution regularity and influence factor analysis of zonal disintegration around deep jointed rock mass: a numerical study based on DEM

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Abstract

Based on the engineering background of the diversion auxiliary tunnel at the Jinping II Hydropower Station, the discrete element method and the particle flow code theory are used to construct a jointed rock mass model. This model fully reflects the joint distribution characteristics and considers the effects of micro-fracturing. The generation and evolution of the zonal disintegration phenomenon are discussed in detail. The numerical results show the same fracture characteristics as the on-site ultrasonic tests. It is indicated that the type of micro-fracture is mainly tensile, but the direction of the extension of the fracture zones is dominated by shear micro-fractures. The root cause of the zonal disintegration of the rock surrounding the tunnel is that the existence of joints makes the internal strength distribution of the rock mass uneven, and the expansion direction of the fracture zone around the tunnel then becomes circumferential. The trace length and spacing of the joints have an influence on the shape and size of the fracture zones. For unbonded joints, the friction coefficient of the smooth-joint model affects the number and locations of the fracture zones. For bonded joints, the cohesion strength of the smooth-joint model has a significant effect on the zonal disintegration of the rock. The results in this paper provide a benchmark for further investigations of the zonal disintegration phenomenon.

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Abbreviations

DEM:

Discrete element method

PFC:

Particle flow code

2D:

Two-dimensional

FJM:

Flat-joint model (numerical model in PFC software)

SJM:

Smooth-joint model (numerical model in PFC software)

E:

Elastic modulus

σucs :

Uniaxial compression strength

σts :

Tensile strength

σb :

Tensile strength (micro-parameters of smooth-joint model)

cb :

Cohesion strength (micro-parameters of smooth-joint model

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Funding

This work was supported by the National Natural Science Foundation of China (grant numbers 51774020 and 51934003), the Program for Yunnan Thousand Talents Plan High-Level Innovation and Entrepreneurship Team, and the Program for Innovative Research Team (in Science and Technology) in the University of Yunnan Province.

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing, 100083, China

    Long Chen, Shunchuan Wu, Aibing Jin & Xue Li

  2. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Shunchuan Wu

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  1. Long Chen
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  2. Shunchuan Wu
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  3. Aibing Jin
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  4. Xue Li
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Correspondence to Aibing Jin.

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Chen, L., Wu, S., Jin, A. et al. The evolution regularity and influence factor analysis of zonal disintegration around deep jointed rock mass: a numerical study based on DEM. Bull Eng Geol Environ 81, 37 (2022). https://doi.org/10.1007/s10064-021-02530-w

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  • DOI: https://doi.org/10.1007/s10064-021-02530-w

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