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Related Experiment Video

Updated: May 2, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

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Published on: November 15, 2013

Numerical simulation on zonal disintegration in deep surrounding rock mass.

Xuguang Chen¹, Yuan Wang², Yu Mei²

¹Institute of Tunnel and Urban Railway Engineering, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221000, China.

Thescientificworldjournal

|March 5, 2014

Summary

Zonal disintegration in underground tunnels is caused by circular fractures in rock masses under high geostress. These fractures form concentric zones with radii in geometric progression, explained by fracture mechanics.

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Area of Science:

Geotechnical Engineering
Rock Mechanics
Fracture Mechanics

Background:

Zonal disintegration is observed in deep underground tunnels.
Traditional rock mechanics cannot fully explain its formation mechanism, fracture shape, or conditions.
High geostress conditions are implicated in tunnel instability.

Purpose of the Study:

To investigate the generating conditions and formation process of zonal disintegration.
To reveal the underlying mechanism of zonal disintegration.
To determine the characteristic fracture shape and geometric relationships of zonal disintegration.

Main Methods:

Numerical simulation of underground tunnels under high geostress.
Geomechanical model testing for validation.
Theoretical analysis based on fracture mechanics.

Main Results:

Zonal disintegration is confirmed as a result of circular fractures in the surrounding rock mass.
Fractured zones are circular, concentric, and develop at the elastic-plastic boundary.
Radii of fractured zones follow a geometric progression related to rock properties and stress.

Conclusions:

The mechanism of zonal disintegration is attributed to the development and coalescence of circular fractures under high geostress.
The geometric progression of fracture radii is a key characteristic of zonal disintegration.
Findings provide a theoretical basis for understanding and mitigating tunnel instability due to zonal disintegration.