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Numerical simulation of zonal disintegration of surrounding rock in the deep-buried chamber

Deep Underground Science and Engineering 2022年第2期1卷 174-182页

作者： Yukai Wang Xiaoli Liu Yanlin Xiong State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijingChina Survey Design&Research Institute China Railway Tunnel Group Co.Ltd.GuangzhouChina

zonal disintegration is the phenomenon of cyclical rupture zone and nonrupture zone in the surrounding rock of a deep-buried chamber,which is different from that of a shallow chamber.Based on the finite difference software FLAC3D,the numerical simulation of surrounding rock with different mechanical parameters was conducted by using the SU model(Bilinear Strain-Softening Ubiquitous-Joint).The influences of buried depth,cohesion,and internal friction angle of surrounding rock on zonal disintegration were analyzed to reveal the influence law.The results show that:(1)after the chamber excavation,multiple rupture zones gradually extend from the chamber surface or adjacent periphery to the deep surrounding rock.In the extension process,a single rupture zone may be forked into two or even multiple rupture zones,which cross each other and form the zonal disintegration zone.(2)zonal disintegration is affected by bothσ(in situ stress)and U_(cs)(uniaxial compression strength).Smaller U_(cs)and largerσwill lead to zonal disintegration.(3)The zoning fracture is not obvious in the case ofσ≤U_(cs).In the reverse case,zoning fracture appears remarkably in the surrounding rock around the chamber.These results reveal the influence law of zonal disintegration and provide theoretical support for the design of deep-buried chambers.

关键词： deep-buried chamber numerical simulation SU model uniaxial compression strength zonal disintegration

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zonal disintegration test of deep tunnel under plane strain conditions

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International Journal of Coal Science & Technology 2020年第2期7卷 337-349页

作者： Zhichao Tian Chun’an Tang Yejiao Liu Yibo Tang School of Resources&Civil Engineering Northeastern UniversityShenyang110819China Inner Mongolia University of Science&Technology Baotou014010China Dalian University of Technology Dalian116024China State Key Laboratory of Deep Coal Mining&Environment Protection Huainan232001China Taiyuan University of Technology Taiyuan116024China

To investigate the zonal disintegration form of the surrounding rock in deep tunnels,model tests were performed in the simulation set-up of fracture mechanism and support technology of surrounding rock in deep tunnel.The test results illustrate that the first fracture of the surrounding rock occurred at the intersection of the tunnel floor and the side wall.After more serious destruction,the side wall and the vault were destroyed.Although the fracture width of each surrounding rock mass was distinct,they were relatively uniform with a nearly continuous fracture form.The width of the split bodies of the model tunnels(i.e.,the annular zonal disintegration area)developed with an increasing load.It was observed from the fitting curves of the data that all radial strain values of the surrounding rock were more symmetric with a smooth fitting curve,and the maximum value occurred near the tunnel wall before reducing instantly.The circumferential strain values were dispersed and the data were inconsistent with the fitting curve,which caused some data to be unreliable.The phenomenon of zonal disintegration was primarily caused by radial tension strain of the surrounding rock.This phenomenon would not extend indefinitely as the rupture range would be limited to a certain extent,because the maximum radial tension strain of the surrounding rock was less than the limiting value.

关键词： Deep tunnel Model test Crack Plain strain zonal disintegration

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Quantitative analysis of rockburst for surrounding rocks and zonal disintegration mechanism in deep tunnels

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第1期3卷 1-9页

作者： Qihu Qian1,Xiaoping Zhou2 1 Engineering Institute of Engineering Corps,PLA University of Science and Technology,Nanjing,210007,China 2 School of Civil Engineering,Chongqing University,Chongqing,400045,China Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing 210007 China School of Civil Engineering Chongqing University Chongqing 400045 China

Rock masses without pre-existing macrocracks can usually be considered as granular materials with only microcracks.During the excavation of the tunnels,microcracks may nucleate,grow and propagate through the rock matrix;secondary microcracks may appear,and discontinuous and incompatible deformation of rock masses may occur.The classical continuum elastoplastic theory is not suitable for analyzing discontinuous and incompatible deformation of rock masses.Based on non-Euclidean model of the discontinuous and incompatible deformation of rock masses,the distribution of stresses in the surrounding rock masses in deep tunnels is fluctuant or wave-like.The stress concentration at the tips of microcracks located in vicinity of stress wave crest is comparatively large,which may lead to the unstable growth and coalescence of secondary microcracks,and consequently the occurrence of fractured zones.On the other hand,the stress concentration at the tips of microcracks located around stress wave trough is relatively small,which may lead to the arrest of microcracks,and thus the non-fractured zones.The alternate appearance of stress wave crest and trough thus may induce the alternate occurrence of fractured and non-fractured zones in deep rock masses.For brittle rocks,the dissipated energy of microcrack growth is small,but the elastic strain energy stored in rock masses may be larger than the dissipated energy growths of pre-existing microcracks and secondary microcracks.The sudden release of the residual elastic strain energy may lead to rockburst.Based on this understanding,the criteria of rockburst are established.Furthermore,the relationship between rockbursts and zonal disintegration in the surrounding rock masses around deep tunnels is studied.The influences of the in-situ stresses and the physico-mechanical parameters on the distribution of rockburst zones and the ejection velocity of rock fragments are investigated in detail.

关键词： underground tunnel rockburst zonal disintegration non-Euclidean model

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Numerical Tests on zonal disintegration within Rockmass Around Deep Tunnel under Dynamic Disturbance

Numerical Tests on Zonal Disintegration within Rockmass Arou...

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2012年计算机应用与系统建模国际会议

作者： Chunchun Chen Yujun Zuo Dekang Zhu Research Center for Numerical Test of Material Failure Dalian University

Numerical tests on three-dimensional rock samples containing hole were carried out with finite element software ANSYS to investigate the mechanism of zonal disintegration within surrounding rockmass around deep circular tunnel under dynamic disturbance. Numerical tests presented the distribution of stress and deformation and visualized zonal disintegration phenomenon of rockmass around deep semiarched tunnel under dynamic loads. The simulation results indicate that zonal disintegration phenomenon may occur, when superposition value of high ground stress and dynamic disturbance satisfies a certain condition.

关键词： Rockmass around deep tunnel zonal disintegration Numerical test Dynamic disturbance

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