Quantitative Risk Analysis of Tunnel Instability in Layered Rock Mass Considering the Spatial Variability of Elastic Modulus

Physical models of layered rock mass with different dip angles are built by physical model test in accordance with the bias failure characteristics of surrounding rocks of layered rock mass in Gonghe Tunnel. Bias failure characteristics of surrounding rocks in thin-layered rock mass and influences of layered rock mass dip angle on stability of tunnel are studied. The research results show that failure characteristics of physical models generally coincide with those of surrounding rocks monitored from the tunnel site. The failure regions of surrounding rock perpendicular to the stratification planes are obviously larger than those parallel to. The stress distributions and failure characteristics in the surrounding rocks are similar to each physical model of different dip angles. The stress distributions and failure regions are all elliptic in shape, in which the major axis is in the direction perpendicular to the stratification planes while the minor axis is parallel to them. As a result, obvious bias failure of surrounding rocks has gradually formed. The physical model tests provide reliable basis for theoretical analysis on the failure mechanism of deep-buried layered rock mass.

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Invert Heave Disease and Treatment Measures of Operating Railway Tunnel in Horizontal Layered Rock Mass

Advanced Tunneling Techniques and Information Modeling of Underground Infrastructure - Sustainable Civil Infrastructures ◽

10.1007/978-3-030-79672-3_3 ◽

2021 ◽

pp. 37-56

Author(s):

Linyi Li ◽

Junsheng Yang ◽

Jian Wu ◽

Shuying Wang ◽

Xinghua Fang ◽

...

Keyword(s):

Rock Mass ◽

Railway Tunnel ◽

Layered Rock ◽

Treatment Measures ◽

Layered Rock Mass

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Constitutive model and elastic parameters for layered rock mass based on combined Hooke spring

Strength Fracture and Complexity ◽

10.3233/sfc-170206 ◽

2018 ◽

Vol 10 (3-4) ◽

pp. 145-156

Author(s):

Zhang Ligang ◽

Qu Guangqiu ◽

Qu Sining ◽

Liu Zhaoyi

Keyword(s):

Rock Mass ◽

Constitutive Model ◽

Elastic Parameters ◽

Layered Rock ◽

Layered Rock Mass

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Research on the Layered Rock Mass Excavation Relaxation Stability of Underground Caverns

E3S Web of Conferences ◽

10.1051/e3sconf/202016503024 ◽

2020 ◽

Vol 165 ◽

pp. 03024

Author(s):

Ying Zhang ◽

Heng Zhou ◽

Shengjie Di ◽

Xi Lu

Keyword(s):

Rock Mass ◽

Mechanical Characteristics ◽

Generation System ◽

Yield Zone ◽

Layered Rock ◽

Underground Caverns ◽

Structure Surface ◽

Layered Rock Mass ◽

Power Generation System ◽

The Stability

In order to compare the influence of rock mass parameters weakening on the deformation and stability of excavation caverns in layered rock mass, based on power generation system caverns of a hydropower station, the stability and deformation of the caverns is analyzed. The results show that the mechanical characteristics of the structure surface play a major role in controlling the stability of caverns. And the displacement and yield zone value of plan 3, which adopt elastic-plastic softening model, are significantly larger than other two. The method which consider the residual strength of structure surface is more suitable for the excavation calculation of layered rock mass cavern.

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